v2025_11_25

Internal wire-shape models for protocol 2025-11-25. Generated; do not edit.

Regenerate with scripts/gen_surface_types.py from schema/2025-11-25.json (sha256 4e01628360a2149892eab8f298ceee626d24a58862184eb8ec85d95b8f353e31).

BaseMetadata

Bases: WireModel

Base interface for metadata with name (identifier) and title (display name) properties.

Source code in src/mcp/types/v2025_11_25/__init__.py

class BaseMetadata(WireModel):
    """
    Base interface for metadata with name (identifier) and title (display name) properties.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    name: str
    """
    Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).
    """
    title: str | None = None
    """
    Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
    even by those unfamiliar with domain-specific terminology.

    If not provided, the name should be used for display (except for Tool,
    where `annotations.title` should be given precedence over using `name`,
    if present).
    """

name instance-attribute

name: str

Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).

title class-attribute instance-attribute

title: str | None = None

Intended for UI and end-user contexts — optimized to be human-readable and easily understood, even by those unfamiliar with domain-specific terminology.

If not provided, the name should be used for display (except for Tool, where annotations.title should be given precedence over using name, if present).

BlobResourceContents

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class BlobResourceContents(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    blob: str
    """
    A base64-encoded string representing the binary data of the item.
    """
    mime_type: Annotated[str | None, Field(alias="mimeType")] = None
    """
    The MIME type of this resource, if known.
    """
    uri: str
    """
    The URI of this resource.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

blob instance-attribute

blob: str

A base64-encoded string representing the binary data of the item.

mime_type class-attribute instance-attribute

mime_type: Annotated[
    str | None, Field(alias="mimeType")
] = None

The MIME type of this resource, if known.

uri instance-attribute

uri: str

The URI of this resource.

Params

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class Params(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    task_id: Annotated[str, Field(alias="taskId")]
    """
    The task identifier to cancel.
    """

task_id instance-attribute

task_id: Annotated[str, Field(alias='taskId')]

The task identifier to cancel.

Elicitation

Bases: WireModel

Present if the client supports elicitation from the server.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Elicitation(WireModel):
    """
    Present if the client supports elicitation from the server.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    form: dict[str, Any] | None = None
    url: dict[str, Any] | None = None

Roots

Bases: WireModel

Present if the client supports listing roots.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Roots(WireModel):
    """
    Present if the client supports listing roots.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    list_changed: Annotated[bool | None, Field(alias="listChanged")] = None
    """
    Whether the client supports notifications for changes to the roots list.
    """

list_changed class-attribute instance-attribute

list_changed: Annotated[
    bool | None, Field(alias="listChanged")
] = None

Whether the client supports notifications for changes to the roots list.

Sampling

Bases: WireModel

Present if the client supports sampling from an LLM.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Sampling(WireModel):
    """
    Present if the client supports sampling from an LLM.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    context: dict[str, Any] | None = None
    """
    Whether the client supports context inclusion via includeContext parameter.
    If not declared, servers SHOULD only use `includeContext: "none"` (or omit it).
    """
    tools: dict[str, Any] | None = None
    """
    Whether the client supports tool use via tools and toolChoice parameters.
    """

context class-attribute instance-attribute

context: dict[str, Any] | None = None

Whether the client supports context inclusion via includeContext parameter. If not declared, servers SHOULD only use includeContext: "none" (or omit it).

tools class-attribute instance-attribute

tools: dict[str, Any] | None = None

Whether the client supports tool use via tools and toolChoice parameters.

Elicitation1

Bases: WireModel

Task support for elicitation-related requests.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Elicitation1(WireModel):
    """
    Task support for elicitation-related requests.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    create: dict[str, Any] | None = None
    """
    Whether the client supports task-augmented elicitation/create requests.
    """

create class-attribute instance-attribute

create: dict[str, Any] | None = None

Whether the client supports task-augmented elicitation/create requests.

Sampling1

Bases: WireModel

Task support for sampling-related requests.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Sampling1(WireModel):
    """
    Task support for sampling-related requests.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    create_message: Annotated[dict[str, Any] | None, Field(alias="createMessage")] = None
    """
    Whether the client supports task-augmented sampling/createMessage requests.
    """

create_message class-attribute instance-attribute

create_message: Annotated[
    dict[str, Any] | None, Field(alias="createMessage")
] = None

Whether the client supports task-augmented sampling/createMessage requests.

Requests

Bases: WireModel

Specifies which request types can be augmented with tasks.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Requests(WireModel):
    """
    Specifies which request types can be augmented with tasks.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    elicitation: Elicitation1 | None = None
    """
    Task support for elicitation-related requests.
    """
    sampling: Sampling1 | None = None
    """
    Task support for sampling-related requests.
    """

elicitation class-attribute instance-attribute

elicitation: Elicitation1 | None = None

Task support for elicitation-related requests.

sampling class-attribute instance-attribute

sampling: Sampling1 | None = None

Task support for sampling-related requests.

Tasks

Bases: WireModel

Present if the client supports task-augmented requests.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Tasks(WireModel):
    """
    Present if the client supports task-augmented requests.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    cancel: dict[str, Any] | None = None
    """
    Whether this client supports tasks/cancel.
    """
    list: dict[str, Any] | None = None
    """
    Whether this client supports tasks/list.
    """
    requests: Requests | None = None
    """
    Specifies which request types can be augmented with tasks.
    """

cancel class-attribute instance-attribute

cancel: dict[str, Any] | None = None

Whether this client supports tasks/cancel.

list class-attribute instance-attribute

list: dict[str, Any] | None = None

Whether this client supports tasks/list.

requests class-attribute instance-attribute

requests: Requests | None = None

Specifies which request types can be augmented with tasks.

ClientCapabilities

Bases: WireModel

Capabilities a client may support. Known capabilities are defined here, in this schema, but this is not a closed set: any client can define its own, additional capabilities.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ClientCapabilities(WireModel):
    """
    Capabilities a client may support. Known capabilities are defined here, in this schema, but this is not a closed set: any client can define its own, additional capabilities.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    elicitation: Elicitation | None = None
    """
    Present if the client supports elicitation from the server.
    """
    experimental: dict[str, dict[str, Any]] | None = None
    """
    Experimental, non-standard capabilities that the client supports.
    """
    roots: Roots | None = None
    """
    Present if the client supports listing roots.
    """
    sampling: Sampling | None = None
    """
    Present if the client supports sampling from an LLM.
    """
    tasks: Tasks | None = None
    """
    Present if the client supports task-augmented requests.
    """

elicitation class-attribute instance-attribute

elicitation: Elicitation | None = None

Present if the client supports elicitation from the server.

experimental class-attribute instance-attribute

experimental: dict[str, dict[str, Any]] | None = None

Experimental, non-standard capabilities that the client supports.

roots class-attribute instance-attribute

roots: Roots | None = None

Present if the client supports listing roots.

sampling class-attribute instance-attribute

sampling: Sampling | None = None

Present if the client supports sampling from an LLM.

tasks class-attribute instance-attribute

tasks: Tasks | None = None

Present if the client supports task-augmented requests.

Argument

Bases: WireModel

The argument's information

Source code in src/mcp/types/v2025_11_25/__init__.py

class Argument(WireModel):
    """
    The argument's information
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    name: str
    """
    The name of the argument
    """
    value: str
    """
    The value of the argument to use for completion matching.
    """

name instance-attribute

name: str

The name of the argument

value instance-attribute

value: str

The value of the argument to use for completion matching.

Context

Bases: WireModel

Additional, optional context for completions

Source code in src/mcp/types/v2025_11_25/__init__.py

class Context(WireModel):
    """
    Additional, optional context for completions
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    arguments: dict[str, str] | None = None
    """
    Previously-resolved variables in a URI template or prompt.
    """

arguments class-attribute instance-attribute

arguments: dict[str, str] | None = None

Previously-resolved variables in a URI template or prompt.

Completion

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class Completion(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    has_more: Annotated[bool | None, Field(alias="hasMore")] = None
    """
    Indicates whether there are additional completion options beyond those provided in the current response, even if the exact total is unknown.
    """
    total: int | None = None
    """
    The total number of completion options available. This can exceed the number of values actually sent in the response.
    """
    values: list[str]
    """
    An array of completion values. Must not exceed 100 items.
    """

has_more class-attribute instance-attribute

has_more: Annotated[bool | None, Field(alias="hasMore")] = (
    None
)

Indicates whether there are additional completion options beyond those provided in the current response, even if the exact total is unknown.

total class-attribute instance-attribute

total: int | None = None

The total number of completion options available. This can exceed the number of values actually sent in the response.

values instance-attribute

values: list[str]

An array of completion values. Must not exceed 100 items.

CompleteResult

Bases: WireModel

The server's response to a completion/complete request

Source code in src/mcp/types/v2025_11_25/__init__.py

class CompleteResult(WireModel):
    """
    The server's response to a completion/complete request
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    completion: Completion

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

Cursor

Bases: RootModel[str]

Source code in src/mcp/types/v2025_11_25/__init__.py

class Cursor(RootModel[str]):
    root: str
    """
    An opaque token used to represent a cursor for pagination.
    """

root instance-attribute

root: str

An opaque token used to represent a cursor for pagination.

RequestedSchema

Bases: WireModel

A restricted subset of JSON Schema. Only top-level properties are allowed, without nesting.

Source code in src/mcp/types/v2025_11_25/__init__.py

class RequestedSchema(WireModel):
    """
    A restricted subset of JSON Schema.
    Only top-level properties are allowed, without nesting.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    schema_: Annotated[str | None, Field(alias="$schema")] = None
    properties: dict[str, Any]
    required: list[str] | None = None
    type: Literal["object"]

ElicitResult

Bases: WireModel

The client's response to an elicitation request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ElicitResult(WireModel):
    """
    The client's response to an elicitation request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    action: Literal["accept", "cancel", "decline"]
    """
    The user action in response to the elicitation.
    - "accept": User submitted the form/confirmed the action
    - "decline": User explicitly decline the action
    - "cancel": User dismissed without making an explicit choice
    """
    content: dict[str, list[str] | str | int | float | bool | None] | None = None
    """
    The submitted form data, only present when action is "accept" and mode was "form".
    Contains values matching the requested schema.
    Omitted for out-of-band mode responses.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

action instance-attribute

action: Literal['accept', 'cancel', 'decline']

The user action in response to the elicitation. - "accept": User submitted the form/confirmed the action - "decline": User explicitly decline the action - "cancel": User dismissed without making an explicit choice

content class-attribute instance-attribute

content: (
    dict[str, list[str] | str | int | float | bool | None]
    | None
) = None

The submitted form data, only present when action is "accept" and mode was "form". Contains values matching the requested schema. Omitted for out-of-band mode responses.

Params1

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class Params1(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    elicitation_id: Annotated[str, Field(alias="elicitationId")]
    """
    The ID of the elicitation that completed.
    """

elicitation_id instance-attribute

elicitation_id: Annotated[str, Field(alias="elicitationId")]

The ID of the elicitation that completed.

ElicitationCompleteNotification

Bases: WireModel

An optional notification from the server to the client, informing it of a completion of a out-of-band elicitation request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ElicitationCompleteNotification(WireModel):
    """
    An optional notification from the server to the client, informing it of a completion of a out-of-band elicitation request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/elicitation/complete"]
    params: Params1

Error

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class Error(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    code: int
    """
    The error type that occurred.
    """
    data: Any | None = None
    """
    Additional information about the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.).
    """
    message: str
    """
    A short description of the error. The message SHOULD be limited to a concise single sentence.
    """

code instance-attribute

code: int

The error type that occurred.

data class-attribute instance-attribute

data: Any | None = None

Additional information about the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.).

message instance-attribute

message: str

A short description of the error. The message SHOULD be limited to a concise single sentence.

Params2

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class Params2(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    task_id: Annotated[str, Field(alias="taskId")]
    """
    The task identifier to retrieve results for.
    """

task_id instance-attribute

task_id: Annotated[str, Field(alias='taskId')]

The task identifier to retrieve results for.

GetTaskPayloadResult

Bases: WireModel

The response to a tasks/result request. The structure matches the result type of the original request. For example, a tools/call task would return the CallToolResult structure.

Source code in src/mcp/types/v2025_11_25/__init__.py

class GetTaskPayloadResult(WireModel):
    """
    The response to a tasks/result request.
    The structure matches the result type of the original request.
    For example, a tools/call task would return the CallToolResult structure.
    """

    model_config = ConfigDict(
        extra="allow",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

Params3

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class Params3(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    task_id: Annotated[str, Field(alias="taskId")]
    """
    The task identifier to query.
    """

task_id instance-attribute

task_id: Annotated[str, Field(alias='taskId')]

The task identifier to query.

Icon

Bases: WireModel

An optionally-sized icon that can be displayed in a user interface.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Icon(WireModel):
    """
    An optionally-sized icon that can be displayed in a user interface.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    mime_type: Annotated[str | None, Field(alias="mimeType")] = None
    """
    Optional MIME type override if the source MIME type is missing or generic.
    For example: `"image/png"`, `"image/jpeg"`, or `"image/svg+xml"`.
    """
    sizes: list[str] | None = None
    """
    Optional array of strings that specify sizes at which the icon can be used.
    Each string should be in WxH format (e.g., `"48x48"`, `"96x96"`) or `"any"` for scalable formats like SVG.

    If not provided, the client should assume that the icon can be used at any size.
    """
    src: str
    """
    A standard URI pointing to an icon resource. May be an HTTP/HTTPS URL or a
    `data:` URI with Base64-encoded image data.

    Consumers SHOULD takes steps to ensure URLs serving icons are from the
    same domain as the client/server or a trusted domain.

    Consumers SHOULD take appropriate precautions when consuming SVGs as they can contain
    executable JavaScript.
    """
    theme: Literal["dark", "light"] | None = None
    """
    Optional specifier for the theme this icon is designed for. `light` indicates
    the icon is designed to be used with a light background, and `dark` indicates
    the icon is designed to be used with a dark background.

    If not provided, the client should assume the icon can be used with any theme.
    """

mime_type class-attribute instance-attribute

mime_type: Annotated[
    str | None, Field(alias="mimeType")
] = None

Optional MIME type override if the source MIME type is missing or generic. For example: "image/png", "image/jpeg", or "image/svg+xml".

sizes class-attribute instance-attribute

sizes: list[str] | None = None

Optional array of strings that specify sizes at which the icon can be used. Each string should be in WxH format (e.g., "48x48", "96x96") or "any" for scalable formats like SVG.

If not provided, the client should assume that the icon can be used at any size.

src instance-attribute

src: str

A standard URI pointing to an icon resource. May be an HTTP/HTTPS URL or a data: URI with Base64-encoded image data.

Consumers SHOULD takes steps to ensure URLs serving icons are from the same domain as the client/server or a trusted domain.

Consumers SHOULD take appropriate precautions when consuming SVGs as they can contain executable JavaScript.

theme class-attribute instance-attribute

theme: Literal['dark', 'light'] | None = None

Optional specifier for the theme this icon is designed for. light indicates the icon is designed to be used with a light background, and dark indicates the icon is designed to be used with a dark background.

If not provided, the client should assume the icon can be used with any theme.

Icons

Bases: WireModel

Base interface to add icons property.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Icons(WireModel):
    """
    Base interface to add `icons` property.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    icons: list[Icon] | None = None
    """
    Optional set of sized icons that the client can display in a user interface.

    Clients that support rendering icons MUST support at least the following MIME types:
    - `image/png` - PNG images (safe, universal compatibility)
    - `image/jpeg` (and `image/jpg`) - JPEG images (safe, universal compatibility)

    Clients that support rendering icons SHOULD also support:
    - `image/svg+xml` - SVG images (scalable but requires security precautions)
    - `image/webp` - WebP images (modern, efficient format)
    """

icons class-attribute instance-attribute

icons: list[Icon] | None = None

Optional set of sized icons that the client can display in a user interface.

Clients that support rendering icons MUST support at least the following MIME types: - image/png - PNG images (safe, universal compatibility) - image/jpeg (and image/jpg) - JPEG images (safe, universal compatibility)

Clients that support rendering icons SHOULD also support: - image/svg+xml - SVG images (scalable but requires security precautions) - image/webp - WebP images (modern, efficient format)

Implementation

Bases: WireModel

Describes the MCP implementation.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Implementation(WireModel):
    """
    Describes the MCP implementation.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    description: str | None = None
    """
    An optional human-readable description of what this implementation does.

    This can be used by clients or servers to provide context about their purpose
    and capabilities. For example, a server might describe the types of resources
    or tools it provides, while a client might describe its intended use case.
    """
    icons: list[Icon] | None = None
    """
    Optional set of sized icons that the client can display in a user interface.

    Clients that support rendering icons MUST support at least the following MIME types:
    - `image/png` - PNG images (safe, universal compatibility)
    - `image/jpeg` (and `image/jpg`) - JPEG images (safe, universal compatibility)

    Clients that support rendering icons SHOULD also support:
    - `image/svg+xml` - SVG images (scalable but requires security precautions)
    - `image/webp` - WebP images (modern, efficient format)
    """
    name: str
    """
    Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).
    """
    title: str | None = None
    """
    Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
    even by those unfamiliar with domain-specific terminology.

    If not provided, the name should be used for display (except for Tool,
    where `annotations.title` should be given precedence over using `name`,
    if present).
    """
    version: str
    website_url: Annotated[str | None, Field(alias="websiteUrl")] = None
    """
    An optional URL of the website for this implementation.
    """

description class-attribute instance-attribute

description: str | None = None

An optional human-readable description of what this implementation does.

This can be used by clients or servers to provide context about their purpose and capabilities. For example, a server might describe the types of resources or tools it provides, while a client might describe its intended use case.

icons class-attribute instance-attribute

icons: list[Icon] | None = None

Optional set of sized icons that the client can display in a user interface.

Clients that support rendering icons MUST support at least the following MIME types: - image/png - PNG images (safe, universal compatibility) - image/jpeg (and image/jpg) - JPEG images (safe, universal compatibility)

Clients that support rendering icons SHOULD also support: - image/svg+xml - SVG images (scalable but requires security precautions) - image/webp - WebP images (modern, efficient format)

name instance-attribute

name: str

Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).

title class-attribute instance-attribute

title: str | None = None

Intended for UI and end-user contexts — optimized to be human-readable and easily understood, even by those unfamiliar with domain-specific terminology.

If not provided, the name should be used for display (except for Tool, where annotations.title should be given precedence over using name, if present).

website_url class-attribute instance-attribute

website_url: Annotated[
    str | None, Field(alias="websiteUrl")
] = None

An optional URL of the website for this implementation.

JSONRPCNotification

Bases: WireModel

A notification which does not expect a response.

Source code in src/mcp/types/v2025_11_25/__init__.py

class JSONRPCNotification(WireModel):
    """
    A notification which does not expect a response.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: str
    params: dict[str, Any] | None = None

LegacyTitledEnumSchema

Bases: WireModel

Use TitledSingleSelectEnumSchema instead. This interface will be removed in a future version.

Source code in src/mcp/types/v2025_11_25/__init__.py

class LegacyTitledEnumSchema(WireModel):
    """
    Use TitledSingleSelectEnumSchema instead.
    This interface will be removed in a future version.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    default: str | None = None
    description: str | None = None
    enum: list[str]
    enum_names: Annotated[list[str] | None, Field(alias="enumNames")] = None
    """
    (Legacy) Display names for enum values.
    Non-standard according to JSON schema 2020-12.
    """
    title: str | None = None
    type: Literal["string"]

enum_names class-attribute instance-attribute

enum_names: Annotated[
    list[str] | None, Field(alias="enumNames")
] = None

(Legacy) Display names for enum values. Non-standard according to JSON schema 2020-12.

LoggingLevel

Bases: RootModel[Literal['alert', 'critical', 'debug', 'emergency', 'error', 'info', 'notice', 'warning']]

Source code in src/mcp/types/v2025_11_25/__init__.py

class LoggingLevel(
    RootModel[
        Literal[
            "alert",
            "critical",
            "debug",
            "emergency",
            "error",
            "info",
            "notice",
            "warning",
        ]
    ]
):
    root: Literal["alert", "critical", "debug", "emergency", "error", "info", "notice", "warning"]
    """
    The severity of a log message.

    These map to syslog message severities, as specified in RFC-5424:
    https://datatracker.ietf.org/doc/html/rfc5424#section-6.2.1
    """

root instance-attribute

root: Literal[
    "alert",
    "critical",
    "debug",
    "emergency",
    "error",
    "info",
    "notice",
    "warning",
]

The severity of a log message.

These map to syslog message severities, as specified in RFC-5424: https://datatracker.ietf.org/doc/html/rfc5424#section-6.2.1

LoggingMessageNotificationParams

Bases: WireModel

Parameters for a notifications/message notification.

Source code in src/mcp/types/v2025_11_25/__init__.py

class LoggingMessageNotificationParams(WireModel):
    """
    Parameters for a `notifications/message` notification.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    data: Any
    """
    The data to be logged, such as a string message or an object. Any JSON serializable type is allowed here.
    """
    level: LoggingLevel
    """
    The severity of this log message.
    """
    logger: str | None = None
    """
    An optional name of the logger issuing this message.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

data instance-attribute

data: Any

The data to be logged, such as a string message or an object. Any JSON serializable type is allowed here.

level instance-attribute

level: LoggingLevel

The severity of this log message.

logger class-attribute instance-attribute

logger: str | None = None

An optional name of the logger issuing this message.

ModelHint

Bases: WireModel

Hints to use for model selection.

Keys not declared here are currently left unspecified by the spec and are up to the client to interpret.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ModelHint(WireModel):
    """
    Hints to use for model selection.

    Keys not declared here are currently left unspecified by the spec and are up
    to the client to interpret.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    name: str | None = None
    """
    A hint for a model name.

    The client SHOULD treat this as a substring of a model name; for example:
     - `claude-3-5-sonnet` should match `claude-3-5-sonnet-20241022`
     - `sonnet` should match `claude-3-5-sonnet-20241022`, `claude-3-sonnet-20240229`, etc.
     - `claude` should match any Claude model

    The client MAY also map the string to a different provider's model name or a different model family, as long as it fills a similar niche; for example:
     - `gemini-1.5-flash` could match `claude-3-haiku-20240307`
    """

name class-attribute instance-attribute

name: str | None = None

A hint for a model name.

The client SHOULD treat this as a substring of a model name; for example: - claude-3-5-sonnet should match claude-3-5-sonnet-20241022 - sonnet should match claude-3-5-sonnet-20241022, claude-3-sonnet-20240229, etc. - claude should match any Claude model

The client MAY also map the string to a different provider's model name or a different model family, as long as it fills a similar niche; for example: - gemini-1.5-flash could match claude-3-haiku-20240307

ModelPreferences

Bases: WireModel

The server's preferences for model selection, requested of the client during sampling.

Because LLMs can vary along multiple dimensions, choosing the "best" model is rarely straightforward. Different models excel in different areas—some are faster but less capable, others are more capable but more expensive, and so on. This interface allows servers to express their priorities across multiple dimensions to help clients make an appropriate selection for their use case.

These preferences are always advisory. The client MAY ignore them. It is also up to the client to decide how to interpret these preferences and how to balance them against other considerations.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ModelPreferences(WireModel):
    """
    The server's preferences for model selection, requested of the client during sampling.

    Because LLMs can vary along multiple dimensions, choosing the "best" model is
    rarely straightforward.  Different models excel in different areas—some are
    faster but less capable, others are more capable but more expensive, and so
    on. This interface allows servers to express their priorities across multiple
    dimensions to help clients make an appropriate selection for their use case.

    These preferences are always advisory. The client MAY ignore them. It is also
    up to the client to decide how to interpret these preferences and how to
    balance them against other considerations.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    cost_priority: Annotated[float | None, Field(alias="costPriority", ge=0.0, le=1.0)] = None
    """
    How much to prioritize cost when selecting a model. A value of 0 means cost
    is not important, while a value of 1 means cost is the most important
    factor.
    """
    hints: list[ModelHint] | None = None
    """
    Optional hints to use for model selection.

    If multiple hints are specified, the client MUST evaluate them in order
    (such that the first match is taken).

    The client SHOULD prioritize these hints over the numeric priorities, but
    MAY still use the priorities to select from ambiguous matches.
    """
    intelligence_priority: Annotated[float | None, Field(alias="intelligencePriority", ge=0.0, le=1.0)] = None
    """
    How much to prioritize intelligence and capabilities when selecting a
    model. A value of 0 means intelligence is not important, while a value of 1
    means intelligence is the most important factor.
    """
    speed_priority: Annotated[float | None, Field(alias="speedPriority", ge=0.0, le=1.0)] = None
    """
    How much to prioritize sampling speed (latency) when selecting a model. A
    value of 0 means speed is not important, while a value of 1 means speed is
    the most important factor.
    """

cost_priority class-attribute instance-attribute

cost_priority: Annotated[
    float | None,
    Field(alias="costPriority", ge=0.0, le=1.0),
] = None

How much to prioritize cost when selecting a model. A value of 0 means cost is not important, while a value of 1 means cost is the most important factor.

hints class-attribute instance-attribute

hints: list[ModelHint] | None = None

Optional hints to use for model selection.

If multiple hints are specified, the client MUST evaluate them in order (such that the first match is taken).

The client SHOULD prioritize these hints over the numeric priorities, but MAY still use the priorities to select from ambiguous matches.

intelligence_priority class-attribute instance-attribute

intelligence_priority: Annotated[
    float | None,
    Field(alias="intelligencePriority", ge=0.0, le=1.0),
] = None

How much to prioritize intelligence and capabilities when selecting a model. A value of 0 means intelligence is not important, while a value of 1 means intelligence is the most important factor.

speed_priority class-attribute instance-attribute

speed_priority: Annotated[
    float | None,
    Field(alias="speedPriority", ge=0.0, le=1.0),
] = None

How much to prioritize sampling speed (latency) when selecting a model. A value of 0 means speed is not important, while a value of 1 means speed is the most important factor.

NotificationParams

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class NotificationParams(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

PaginatedResult

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class PaginatedResult(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    next_cursor: Annotated[str | None, Field(alias="nextCursor")] = None
    """
    An opaque token representing the pagination position after the last returned result.
    If present, there may be more results available.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

next_cursor class-attribute instance-attribute

next_cursor: Annotated[
    str | None, Field(alias="nextCursor")
] = None

An opaque token representing the pagination position after the last returned result. If present, there may be more results available.

ProgressToken

Bases: RootModel[str | int]

Source code in src/mcp/types/v2025_11_25/__init__.py

class ProgressToken(RootModel[str | int]):
    root: str | int
    """
    A progress token, used to associate progress notifications with the original request.
    """

root instance-attribute

root: str | int

A progress token, used to associate progress notifications with the original request.

PromptArgument

Bases: WireModel

Describes an argument that a prompt can accept.

Source code in src/mcp/types/v2025_11_25/__init__.py

class PromptArgument(WireModel):
    """
    Describes an argument that a prompt can accept.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    description: str | None = None
    """
    A human-readable description of the argument.
    """
    name: str
    """
    Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).
    """
    required: bool | None = None
    """
    Whether this argument must be provided.
    """
    title: str | None = None
    """
    Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
    even by those unfamiliar with domain-specific terminology.

    If not provided, the name should be used for display (except for Tool,
    where `annotations.title` should be given precedence over using `name`,
    if present).
    """

description class-attribute instance-attribute

description: str | None = None

A human-readable description of the argument.

name instance-attribute

name: str

Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).

required class-attribute instance-attribute

required: bool | None = None

Whether this argument must be provided.

title class-attribute instance-attribute

title: str | None = None

Intended for UI and end-user contexts — optimized to be human-readable and easily understood, even by those unfamiliar with domain-specific terminology.

If not provided, the name should be used for display (except for Tool, where annotations.title should be given precedence over using name, if present).

PromptListChangedNotification

Bases: WireModel

An optional notification from the server to the client, informing it that the list of prompts it offers has changed. This may be issued by servers without any previous subscription from the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class PromptListChangedNotification(WireModel):
    """
    An optional notification from the server to the client, informing it that the list of prompts it offers has changed. This may be issued by servers without any previous subscription from the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/prompts/list_changed"]
    params: NotificationParams | None = None

PromptReference

Bases: WireModel

Identifies a prompt.

Source code in src/mcp/types/v2025_11_25/__init__.py

class PromptReference(WireModel):
    """
    Identifies a prompt.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    name: str
    """
    Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).
    """
    title: str | None = None
    """
    Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
    even by those unfamiliar with domain-specific terminology.

    If not provided, the name should be used for display (except for Tool,
    where `annotations.title` should be given precedence over using `name`,
    if present).
    """
    type: Literal["ref/prompt"]

name instance-attribute

name: str

Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).

title class-attribute instance-attribute

title: str | None = None

Intended for UI and end-user contexts — optimized to be human-readable and easily understood, even by those unfamiliar with domain-specific terminology.

If not provided, the name should be used for display (except for Tool, where annotations.title should be given precedence over using name, if present).

Meta

Bases: WireModel

See General fields: _meta for notes on _meta usage.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Meta(WireModel):
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """

    model_config = ConfigDict(
        extra="allow",
    )
    progress_token: Annotated[ProgressToken | None, Field(alias="progressToken")] = None
    """
    If specified, the caller is requesting out-of-band progress notifications for this request (as represented by notifications/progress). The value of this parameter is an opaque token that will be attached to any subsequent notifications. The receiver is not obligated to provide these notifications.
    """

progress_token class-attribute instance-attribute

progress_token: Annotated[
    ProgressToken | None, Field(alias="progressToken")
] = None

If specified, the caller is requesting out-of-band progress notifications for this request (as represented by notifications/progress). The value of this parameter is an opaque token that will be attached to any subsequent notifications. The receiver is not obligated to provide these notifications.

ReadResourceRequestParams

Bases: WireModel

Parameters for a resources/read request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ReadResourceRequestParams(WireModel):
    """
    Parameters for a `resources/read` request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    uri: str
    """
    The URI of the resource. The URI can use any protocol; it is up to the server how to interpret it.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

uri instance-attribute

uri: str

The URI of the resource. The URI can use any protocol; it is up to the server how to interpret it.

RelatedTaskMetadata

Bases: WireModel

Metadata for associating messages with a task. Include this in the _meta field under the key io.modelcontextprotocol/related-task.

Source code in src/mcp/types/v2025_11_25/__init__.py

class RelatedTaskMetadata(WireModel):
    """
    Metadata for associating messages with a task.
    Include this in the `_meta` field under the key `io.modelcontextprotocol/related-task`.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    task_id: Annotated[str, Field(alias="taskId")]
    """
    The task identifier this message is associated with.
    """

task_id instance-attribute

task_id: Annotated[str, Field(alias='taskId')]

The task identifier this message is associated with.

RequestId

Bases: RootModel[str | int]

Source code in src/mcp/types/v2025_11_25/__init__.py

class RequestId(RootModel[str | int]):
    root: str | int
    """
    A uniquely identifying ID for a request in JSON-RPC.
    """

root instance-attribute

root: str | int

A uniquely identifying ID for a request in JSON-RPC.

RequestParams

Bases: WireModel

Common params for any request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class RequestParams(WireModel):
    """
    Common params for any request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

ResourceContents

Bases: WireModel

The contents of a specific resource or sub-resource.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ResourceContents(WireModel):
    """
    The contents of a specific resource or sub-resource.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    mime_type: Annotated[str | None, Field(alias="mimeType")] = None
    """
    The MIME type of this resource, if known.
    """
    uri: str
    """
    The URI of this resource.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

mime_type class-attribute instance-attribute

mime_type: Annotated[
    str | None, Field(alias="mimeType")
] = None

The MIME type of this resource, if known.

uri instance-attribute

uri: str

The URI of this resource.

ResourceListChangedNotification

Bases: WireModel

An optional notification from the server to the client, informing it that the list of resources it can read from has changed. This may be issued by servers without any previous subscription from the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ResourceListChangedNotification(WireModel):
    """
    An optional notification from the server to the client, informing it that the list of resources it can read from has changed. This may be issued by servers without any previous subscription from the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/resources/list_changed"]
    params: NotificationParams | None = None

ResourceRequestParams

Bases: WireModel

Common parameters when working with resources.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ResourceRequestParams(WireModel):
    """
    Common parameters when working with resources.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    uri: str
    """
    The URI of the resource. The URI can use any protocol; it is up to the server how to interpret it.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

uri instance-attribute

uri: str

The URI of the resource. The URI can use any protocol; it is up to the server how to interpret it.

ResourceTemplateReference

Bases: WireModel

A reference to a resource or resource template definition.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ResourceTemplateReference(WireModel):
    """
    A reference to a resource or resource template definition.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    type: Literal["ref/resource"]
    uri: str
    """
    The URI or URI template of the resource.
    """

uri instance-attribute

uri: str

The URI or URI template of the resource.

ResourceUpdatedNotificationParams

Bases: WireModel

Parameters for a notifications/resources/updated notification.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ResourceUpdatedNotificationParams(WireModel):
    """
    Parameters for a `notifications/resources/updated` notification.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    uri: str
    """
    The URI of the resource that has been updated. This might be a sub-resource of the one that the client actually subscribed to.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

uri instance-attribute

uri: str

The URI of the resource that has been updated. This might be a sub-resource of the one that the client actually subscribed to.

Result

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class Result(WireModel):
    model_config = ConfigDict(
        extra="allow",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

Role

Bases: RootModel[Literal['assistant', 'user']]

Source code in src/mcp/types/v2025_11_25/__init__.py

class Role(RootModel[Literal["assistant", "user"]]):
    root: Literal["assistant", "user"]
    """
    The sender or recipient of messages and data in a conversation.
    """

root instance-attribute

root: Literal['assistant', 'user']

The sender or recipient of messages and data in a conversation.

Root

Bases: WireModel

Represents a root directory or file that the server can operate on.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Root(WireModel):
    """
    Represents a root directory or file that the server can operate on.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    name: str | None = None
    """
    An optional name for the root. This can be used to provide a human-readable
    identifier for the root, which may be useful for display purposes or for
    referencing the root in other parts of the application.
    """
    uri: str
    """
    The URI identifying the root. This *must* start with file:// for now.
    This restriction may be relaxed in future versions of the protocol to allow
    other URI schemes.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

name class-attribute instance-attribute

name: str | None = None

An optional name for the root. This can be used to provide a human-readable identifier for the root, which may be useful for display purposes or for referencing the root in other parts of the application.

uri instance-attribute

uri: str

The URI identifying the root. This must start with file:// for now. This restriction may be relaxed in future versions of the protocol to allow other URI schemes.

RootsListChangedNotification

Bases: WireModel

A notification from the client to the server, informing it that the list of roots has changed. This notification should be sent whenever the client adds, removes, or modifies any root. The server should then request an updated list of roots using the ListRootsRequest.

Source code in src/mcp/types/v2025_11_25/__init__.py

class RootsListChangedNotification(WireModel):
    """
    A notification from the client to the server, informing it that the list of roots has changed.
    This notification should be sent whenever the client adds, removes, or modifies any root.
    The server should then request an updated list of roots using the ListRootsRequest.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/roots/list_changed"]
    params: NotificationParams | None = None

Prompts

Bases: WireModel

Present if the server offers any prompt templates.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Prompts(WireModel):
    """
    Present if the server offers any prompt templates.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    list_changed: Annotated[bool | None, Field(alias="listChanged")] = None
    """
    Whether this server supports notifications for changes to the prompt list.
    """

list_changed class-attribute instance-attribute

list_changed: Annotated[
    bool | None, Field(alias="listChanged")
] = None

Whether this server supports notifications for changes to the prompt list.

Resources

Bases: WireModel

Present if the server offers any resources to read.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Resources(WireModel):
    """
    Present if the server offers any resources to read.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    list_changed: Annotated[bool | None, Field(alias="listChanged")] = None
    """
    Whether this server supports notifications for changes to the resource list.
    """
    subscribe: bool | None = None
    """
    Whether this server supports subscribing to resource updates.
    """

list_changed class-attribute instance-attribute

list_changed: Annotated[
    bool | None, Field(alias="listChanged")
] = None

Whether this server supports notifications for changes to the resource list.

subscribe class-attribute instance-attribute

subscribe: bool | None = None

Whether this server supports subscribing to resource updates.

Tools

Bases: WireModel

Task support for tool-related requests.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Tools(WireModel):
    """
    Task support for tool-related requests.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    call: dict[str, Any] | None = None
    """
    Whether the server supports task-augmented tools/call requests.
    """

call class-attribute instance-attribute

call: dict[str, Any] | None = None

Whether the server supports task-augmented tools/call requests.

Requests1

Bases: WireModel

Specifies which request types can be augmented with tasks.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Requests1(WireModel):
    """
    Specifies which request types can be augmented with tasks.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    tools: Tools | None = None
    """
    Task support for tool-related requests.
    """

tools class-attribute instance-attribute

tools: Tools | None = None

Task support for tool-related requests.

Tasks1

Bases: WireModel

Present if the server supports task-augmented requests.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Tasks1(WireModel):
    """
    Present if the server supports task-augmented requests.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    cancel: dict[str, Any] | None = None
    """
    Whether this server supports tasks/cancel.
    """
    list: dict[str, Any] | None = None
    """
    Whether this server supports tasks/list.
    """
    requests: Requests1 | None = None
    """
    Specifies which request types can be augmented with tasks.
    """

cancel class-attribute instance-attribute

cancel: dict[str, Any] | None = None

Whether this server supports tasks/cancel.

list class-attribute instance-attribute

list: dict[str, Any] | None = None

Whether this server supports tasks/list.

requests class-attribute instance-attribute

requests: Requests1 | None = None

Specifies which request types can be augmented with tasks.

Tools1

Bases: WireModel

Present if the server offers any tools to call.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Tools1(WireModel):
    """
    Present if the server offers any tools to call.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    list_changed: Annotated[bool | None, Field(alias="listChanged")] = None
    """
    Whether this server supports notifications for changes to the tool list.
    """

list_changed class-attribute instance-attribute

list_changed: Annotated[
    bool | None, Field(alias="listChanged")
] = None

Whether this server supports notifications for changes to the tool list.

ServerCapabilities

Bases: WireModel

Capabilities that a server may support. Known capabilities are defined here, in this schema, but this is not a closed set: any server can define its own, additional capabilities.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ServerCapabilities(WireModel):
    """
    Capabilities that a server may support. Known capabilities are defined here, in this schema, but this is not a closed set: any server can define its own, additional capabilities.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    completions: dict[str, Any] | None = None
    """
    Present if the server supports argument autocompletion suggestions.
    """
    experimental: dict[str, dict[str, Any]] | None = None
    """
    Experimental, non-standard capabilities that the server supports.
    """
    logging: dict[str, Any] | None = None
    """
    Present if the server supports sending log messages to the client.
    """
    prompts: Prompts | None = None
    """
    Present if the server offers any prompt templates.
    """
    resources: Resources | None = None
    """
    Present if the server offers any resources to read.
    """
    tasks: Tasks1 | None = None
    """
    Present if the server supports task-augmented requests.
    """
    tools: Tools1 | None = None
    """
    Present if the server offers any tools to call.
    """

completions class-attribute instance-attribute

completions: dict[str, Any] | None = None

Present if the server supports argument autocompletion suggestions.

experimental class-attribute instance-attribute

experimental: dict[str, dict[str, Any]] | None = None

Experimental, non-standard capabilities that the server supports.

logging class-attribute instance-attribute

logging: dict[str, Any] | None = None

Present if the server supports sending log messages to the client.

prompts class-attribute instance-attribute

prompts: Prompts | None = None

Present if the server offers any prompt templates.

resources class-attribute instance-attribute

resources: Resources | None = None

Present if the server offers any resources to read.

tasks class-attribute instance-attribute

tasks: Tasks1 | None = None

Present if the server supports task-augmented requests.

tools class-attribute instance-attribute

tools: Tools1 | None = None

Present if the server offers any tools to call.

SetLevelRequestParams

Bases: WireModel

Parameters for a logging/setLevel request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class SetLevelRequestParams(WireModel):
    """
    Parameters for a `logging/setLevel` request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    level: LoggingLevel
    """
    The level of logging that the client wants to receive from the server. The server should send all logs at this level and higher (i.e., more severe) to the client as notifications/message.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

level instance-attribute

level: LoggingLevel

The level of logging that the client wants to receive from the server. The server should send all logs at this level and higher (i.e., more severe) to the client as notifications/message.

SubscribeRequestParams

Bases: WireModel

Parameters for a resources/subscribe request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class SubscribeRequestParams(WireModel):
    """
    Parameters for a `resources/subscribe` request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    uri: str
    """
    The URI of the resource. The URI can use any protocol; it is up to the server how to interpret it.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

uri instance-attribute

uri: str

The URI of the resource. The URI can use any protocol; it is up to the server how to interpret it.

TaskMetadata

Bases: WireModel

Metadata for augmenting a request with task execution. Include this in the task field of the request parameters.

Source code in src/mcp/types/v2025_11_25/__init__.py

class TaskMetadata(WireModel):
    """
    Metadata for augmenting a request with task execution.
    Include this in the `task` field of the request parameters.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    ttl: int | None = None
    """
    Requested duration in milliseconds to retain task from creation.
    """

ttl class-attribute instance-attribute

ttl: int | None = None

Requested duration in milliseconds to retain task from creation.

TaskStatus

Bases: RootModel[Literal['cancelled', 'completed', 'failed', 'input_required', 'working']]

Source code in src/mcp/types/v2025_11_25/__init__.py

class TaskStatus(RootModel[Literal["cancelled", "completed", "failed", "input_required", "working"]]):
    root: Literal["cancelled", "completed", "failed", "input_required", "working"]
    """
    The status of a task.
    """

root instance-attribute

root: Literal[
    "cancelled",
    "completed",
    "failed",
    "input_required",
    "working",
]

The status of a task.

TextResourceContents

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class TextResourceContents(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    mime_type: Annotated[str | None, Field(alias="mimeType")] = None
    """
    The MIME type of this resource, if known.
    """
    text: str
    """
    The text of the item. This must only be set if the item can actually be represented as text (not binary data).
    """
    uri: str
    """
    The URI of this resource.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

mime_type class-attribute instance-attribute

mime_type: Annotated[
    str | None, Field(alias="mimeType")
] = None

The MIME type of this resource, if known.

text instance-attribute

text: str

The text of the item. This must only be set if the item can actually be represented as text (not binary data).

uri instance-attribute

uri: str

The URI of this resource.

AnyOfItem

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class AnyOfItem(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    const: str
    """
    The constant enum value.
    """
    title: str
    """
    Display title for this option.
    """

const instance-attribute

const: str

The constant enum value.

title instance-attribute

title: str

Display title for this option.

Items

Bases: WireModel

Schema for array items with enum options and display labels.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Items(WireModel):
    """
    Schema for array items with enum options and display labels.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    any_of: Annotated[list[AnyOfItem], Field(alias="anyOf")]
    """
    Array of enum options with values and display labels.
    """

any_of instance-attribute

any_of: Annotated[list[AnyOfItem], Field(alias='anyOf')]

Array of enum options with values and display labels.

TitledMultiSelectEnumSchema

Bases: WireModel

Schema for multiple-selection enumeration with display titles for each option.

Source code in src/mcp/types/v2025_11_25/__init__.py

class TitledMultiSelectEnumSchema(WireModel):
    """
    Schema for multiple-selection enumeration with display titles for each option.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    default: list[str] | None = None
    """
    Optional default value.
    """
    description: str | None = None
    """
    Optional description for the enum field.
    """
    items: Items
    """
    Schema for array items with enum options and display labels.
    """
    max_items: Annotated[int | None, Field(alias="maxItems")] = None
    """
    Maximum number of items to select.
    """
    min_items: Annotated[int | None, Field(alias="minItems")] = None
    """
    Minimum number of items to select.
    """
    title: str | None = None
    """
    Optional title for the enum field.
    """
    type: Literal["array"]

default class-attribute instance-attribute

default: list[str] | None = None

Optional default value.

description class-attribute instance-attribute

description: str | None = None

Optional description for the enum field.

items instance-attribute

items: Items

Schema for array items with enum options and display labels.

max_items class-attribute instance-attribute

max_items: Annotated[
    int | None, Field(alias="maxItems")
] = None

Maximum number of items to select.

min_items class-attribute instance-attribute

min_items: Annotated[
    int | None, Field(alias="minItems")
] = None

Minimum number of items to select.

title class-attribute instance-attribute

title: str | None = None

Optional title for the enum field.

OneOfItem

Bases: WireModel

Source code in src/mcp/types/v2025_11_25/__init__.py

class OneOfItem(WireModel):
    model_config = ConfigDict(
        extra="ignore",
    )
    const: str
    """
    The enum value.
    """
    title: str
    """
    Display label for this option.
    """

const instance-attribute

const: str

The enum value.

title instance-attribute

title: str

Display label for this option.

TitledSingleSelectEnumSchema

Bases: WireModel

Schema for single-selection enumeration with display titles for each option.

Source code in src/mcp/types/v2025_11_25/__init__.py

class TitledSingleSelectEnumSchema(WireModel):
    """
    Schema for single-selection enumeration with display titles for each option.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    default: str | None = None
    """
    Optional default value.
    """
    description: str | None = None
    """
    Optional description for the enum field.
    """
    one_of: Annotated[list[OneOfItem], Field(alias="oneOf")]
    """
    Array of enum options with values and display labels.
    """
    title: str | None = None
    """
    Optional title for the enum field.
    """
    type: Literal["string"]

default class-attribute instance-attribute

default: str | None = None

Optional default value.

description class-attribute instance-attribute

description: str | None = None

Optional description for the enum field.

one_of instance-attribute

one_of: Annotated[list[OneOfItem], Field(alias='oneOf')]

Array of enum options with values and display labels.

title class-attribute instance-attribute

title: str | None = None

Optional title for the enum field.

InputSchema

Bases: WireModel

A JSON Schema object defining the expected parameters for the tool.

Source code in src/mcp/types/v2025_11_25/__init__.py

class InputSchema(WireModel):
    """
    A JSON Schema object defining the expected parameters for the tool.
    """

    model_config = ConfigDict(
        extra="allow",
    )
    schema_: Annotated[str | None, Field(alias="$schema")] = None
    properties: dict[str, dict[str, Any]] | None = None
    required: list[str] | None = None
    type: Literal["object"]

OutputSchema

Bases: WireModel

An optional JSON Schema object defining the structure of the tool's output returned in the structuredContent field of a CallToolResult.

Defaults to JSON Schema 2020-12 when no explicit $schema is provided. Currently restricted to type: "object" at the root level.

Source code in src/mcp/types/v2025_11_25/__init__.py

class OutputSchema(WireModel):
    """
    An optional JSON Schema object defining the structure of the tool's output returned in
    the structuredContent field of a CallToolResult.

    Defaults to JSON Schema 2020-12 when no explicit $schema is provided.
    Currently restricted to type: "object" at the root level.
    """

    model_config = ConfigDict(
        extra="allow",
    )
    schema_: Annotated[str | None, Field(alias="$schema")] = None
    properties: dict[str, dict[str, Any]] | None = None
    required: list[str] | None = None
    type: Literal["object"]

ToolAnnotations

Bases: WireModel

Additional properties describing a Tool to clients.

NOTE: all properties in ToolAnnotations are hints. They are not guaranteed to provide a faithful description of tool behavior (including descriptive properties like title).

Clients should never make tool use decisions based on ToolAnnotations received from untrusted servers.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ToolAnnotations(WireModel):
    """
    Additional properties describing a Tool to clients.

    NOTE: all properties in ToolAnnotations are **hints**.
    They are not guaranteed to provide a faithful description of
    tool behavior (including descriptive properties like `title`).

    Clients should never make tool use decisions based on ToolAnnotations
    received from untrusted servers.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    destructive_hint: Annotated[bool | None, Field(alias="destructiveHint")] = None
    """
    If true, the tool may perform destructive updates to its environment.
    If false, the tool performs only additive updates.

    (This property is meaningful only when `readOnlyHint == false`)

    Default: true
    """
    idempotent_hint: Annotated[bool | None, Field(alias="idempotentHint")] = None
    """
    If true, calling the tool repeatedly with the same arguments
    will have no additional effect on its environment.

    (This property is meaningful only when `readOnlyHint == false`)

    Default: false
    """
    open_world_hint: Annotated[bool | None, Field(alias="openWorldHint")] = None
    """
    If true, this tool may interact with an "open world" of external
    entities. If false, the tool's domain of interaction is closed.
    For example, the world of a web search tool is open, whereas that
    of a memory tool is not.

    Default: true
    """
    read_only_hint: Annotated[bool | None, Field(alias="readOnlyHint")] = None
    """
    If true, the tool does not modify its environment.

    Default: false
    """
    title: str | None = None
    """
    A human-readable title for the tool.
    """

destructive_hint class-attribute instance-attribute

destructive_hint: Annotated[
    bool | None, Field(alias="destructiveHint")
] = None

If true, the tool may perform destructive updates to its environment. If false, the tool performs only additive updates.

(This property is meaningful only when readOnlyHint == false)

Default: true

idempotent_hint class-attribute instance-attribute

idempotent_hint: Annotated[
    bool | None, Field(alias="idempotentHint")
] = None

If true, calling the tool repeatedly with the same arguments will have no additional effect on its environment.

(This property is meaningful only when readOnlyHint == false)

Default: false

open_world_hint class-attribute instance-attribute

open_world_hint: Annotated[
    bool | None, Field(alias="openWorldHint")
] = None

If true, this tool may interact with an "open world" of external entities. If false, the tool's domain of interaction is closed. For example, the world of a web search tool is open, whereas that of a memory tool is not.

Default: true

read_only_hint class-attribute instance-attribute

read_only_hint: Annotated[
    bool | None, Field(alias="readOnlyHint")
] = None

If true, the tool does not modify its environment.

Default: false

title class-attribute instance-attribute

title: str | None = None

A human-readable title for the tool.

ToolChoice

Bases: WireModel

Controls tool selection behavior for sampling requests.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ToolChoice(WireModel):
    """
    Controls tool selection behavior for sampling requests.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    mode: Literal["auto", "none", "required"] | None = None
    """
    Controls the tool use ability of the model:
    - "auto": Model decides whether to use tools (default)
    - "required": Model MUST use at least one tool before completing
    - "none": Model MUST NOT use any tools
    """

mode class-attribute instance-attribute

mode: Literal['auto', 'none', 'required'] | None = None

Controls the tool use ability of the model: - "auto": Model decides whether to use tools (default) - "required": Model MUST use at least one tool before completing - "none": Model MUST NOT use any tools

ToolExecution

Bases: WireModel

Execution-related properties for a tool.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ToolExecution(WireModel):
    """
    Execution-related properties for a tool.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    task_support: Annotated[Literal["forbidden", "optional", "required"] | None, Field(alias="taskSupport")] = None
    """
    Indicates whether this tool supports task-augmented execution.
    This allows clients to handle long-running operations through polling
    the task system.

    - "forbidden": Tool does not support task-augmented execution (default when absent)
    - "optional": Tool may support task-augmented execution
    - "required": Tool requires task-augmented execution

    Default: "forbidden"
    """

task_support class-attribute instance-attribute

task_support: Annotated[
    Literal["forbidden", "optional", "required"] | None,
    Field(alias="taskSupport"),
] = None

Indicates whether this tool supports task-augmented execution. This allows clients to handle long-running operations through polling the task system.

• "forbidden": Tool does not support task-augmented execution (default when absent)
• "optional": Tool may support task-augmented execution
• "required": Tool requires task-augmented execution

Default: "forbidden"

ToolListChangedNotification

Bases: WireModel

An optional notification from the server to the client, informing it that the list of tools it offers has changed. This may be issued by servers without any previous subscription from the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ToolListChangedNotification(WireModel):
    """
    An optional notification from the server to the client, informing it that the list of tools it offers has changed. This may be issued by servers without any previous subscription from the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/tools/list_changed"]
    params: NotificationParams | None = None

ToolUseContent

Bases: WireModel

A request from the assistant to call a tool.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ToolUseContent(WireModel):
    """
    A request from the assistant to call a tool.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    Optional metadata about the tool use. Clients SHOULD preserve this field when
    including tool uses in subsequent sampling requests to enable caching optimizations.

    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    id: str
    """
    A unique identifier for this tool use.

    This ID is used to match tool results to their corresponding tool uses.
    """
    input: dict[str, Any]
    """
    The arguments to pass to the tool, conforming to the tool's input schema.
    """
    name: str
    """
    The name of the tool to call.
    """
    type: Literal["tool_use"]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

Optional metadata about the tool use. Clients SHOULD preserve this field when including tool uses in subsequent sampling requests to enable caching optimizations.

See General fields: _meta for notes on _meta usage.

id instance-attribute

id: str

A unique identifier for this tool use.

This ID is used to match tool results to their corresponding tool uses.

input instance-attribute

input: dict[str, Any]

The arguments to pass to the tool, conforming to the tool's input schema.

name instance-attribute

name: str

The name of the tool to call.

UnsubscribeRequestParams

Bases: WireModel

Parameters for a resources/unsubscribe request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class UnsubscribeRequestParams(WireModel):
    """
    Parameters for a `resources/unsubscribe` request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    uri: str
    """
    The URI of the resource. The URI can use any protocol; it is up to the server how to interpret it.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

uri instance-attribute

uri: str

The URI of the resource. The URI can use any protocol; it is up to the server how to interpret it.

Items1

Bases: WireModel

Schema for the array items.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Items1(WireModel):
    """
    Schema for the array items.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    enum: list[str]
    """
    Array of enum values to choose from.
    """
    type: Literal["string"]

enum instance-attribute

enum: list[str]

Array of enum values to choose from.

UntitledMultiSelectEnumSchema

Bases: WireModel

Schema for multiple-selection enumeration without display titles for options.

Source code in src/mcp/types/v2025_11_25/__init__.py

class UntitledMultiSelectEnumSchema(WireModel):
    """
    Schema for multiple-selection enumeration without display titles for options.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    default: list[str] | None = None
    """
    Optional default value.
    """
    description: str | None = None
    """
    Optional description for the enum field.
    """
    items: Items1
    """
    Schema for the array items.
    """
    max_items: Annotated[int | None, Field(alias="maxItems")] = None
    """
    Maximum number of items to select.
    """
    min_items: Annotated[int | None, Field(alias="minItems")] = None
    """
    Minimum number of items to select.
    """
    title: str | None = None
    """
    Optional title for the enum field.
    """
    type: Literal["array"]

default class-attribute instance-attribute

default: list[str] | None = None

Optional default value.

description class-attribute instance-attribute

description: str | None = None

Optional description for the enum field.

items instance-attribute

items: Items1

Schema for the array items.

max_items class-attribute instance-attribute

max_items: Annotated[
    int | None, Field(alias="maxItems")
] = None

Maximum number of items to select.

min_items class-attribute instance-attribute

min_items: Annotated[
    int | None, Field(alias="minItems")
] = None

Minimum number of items to select.

title class-attribute instance-attribute

title: str | None = None

Optional title for the enum field.

UntitledSingleSelectEnumSchema

Bases: WireModel

Schema for single-selection enumeration without display titles for options.

Source code in src/mcp/types/v2025_11_25/__init__.py

class UntitledSingleSelectEnumSchema(WireModel):
    """
    Schema for single-selection enumeration without display titles for options.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    default: str | None = None
    """
    Optional default value.
    """
    description: str | None = None
    """
    Optional description for the enum field.
    """
    enum: list[str]
    """
    Array of enum values to choose from.
    """
    title: str | None = None
    """
    Optional title for the enum field.
    """
    type: Literal["string"]

default class-attribute instance-attribute

default: str | None = None

Optional default value.

description class-attribute instance-attribute

description: str | None = None

Optional description for the enum field.

enum instance-attribute

enum: list[str]

Array of enum values to choose from.

title class-attribute instance-attribute

title: str | None = None

Optional title for the enum field.

Annotations

Bases: WireModel

Optional annotations for the client. The client can use annotations to inform how objects are used or displayed

Source code in src/mcp/types/v2025_11_25/__init__.py

class Annotations(WireModel):
    """
    Optional annotations for the client. The client can use annotations to inform how objects are used or displayed
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    audience: list[Role] | None = None
    """
    Describes who the intended audience of this object or data is.

    It can include multiple entries to indicate content useful for multiple audiences (e.g., `["user", "assistant"]`).
    """
    last_modified: Annotated[str | None, Field(alias="lastModified")] = None
    """
    The moment the resource was last modified, as an ISO 8601 formatted string.

    Should be an ISO 8601 formatted string (e.g., "2025-01-12T15:00:58Z").

    Examples: last activity timestamp in an open file, timestamp when the resource
    was attached, etc.
    """
    priority: Annotated[float | None, Field(ge=0.0, le=1.0)] = None
    """
    Describes how important this data is for operating the server.

    A value of 1 means "most important," and indicates that the data is
    effectively required, while 0 means "least important," and indicates that
    the data is entirely optional.
    """

audience class-attribute instance-attribute

audience: list[Role] | None = None

Describes who the intended audience of this object or data is.

It can include multiple entries to indicate content useful for multiple audiences (e.g., ["user", "assistant"]).

last_modified class-attribute instance-attribute

last_modified: Annotated[
    str | None, Field(alias="lastModified")
] = None

The moment the resource was last modified, as an ISO 8601 formatted string.

Should be an ISO 8601 formatted string (e.g., "2025-01-12T15:00:58Z").

Examples: last activity timestamp in an open file, timestamp when the resource was attached, etc.

priority class-attribute instance-attribute

priority: Annotated[float | None, Field(ge=0.0, le=1.0)] = (
    None
)

Describes how important this data is for operating the server.

A value of 1 means "most important," and indicates that the data is effectively required, while 0 means "least important," and indicates that the data is entirely optional.

AudioContent

Bases: WireModel

Audio provided to or from an LLM.

Source code in src/mcp/types/v2025_11_25/__init__.py

class AudioContent(WireModel):
    """
    Audio provided to or from an LLM.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    annotations: Annotations | None = None
    """
    Optional annotations for the client.
    """
    data: str
    """
    The base64-encoded audio data.
    """
    mime_type: Annotated[str, Field(alias="mimeType")]
    """
    The MIME type of the audio. Different providers may support different audio types.
    """
    type: Literal["audio"]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

annotations class-attribute instance-attribute

annotations: Annotations | None = None

Optional annotations for the client.

data instance-attribute

data: str

The base64-encoded audio data.

mime_type instance-attribute

mime_type: Annotated[str, Field(alias='mimeType')]

The MIME type of the audio. Different providers may support different audio types.

CallToolRequestParams

Bases: WireModel

Parameters for a tools/call request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CallToolRequestParams(WireModel):
    """
    Parameters for a `tools/call` request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    arguments: dict[str, Any] | None = None
    """
    Arguments to use for the tool call.
    """
    name: str
    """
    The name of the tool.
    """
    task: TaskMetadata | None = None
    """
    If specified, the caller is requesting task-augmented execution for this request.
    The request will return a CreateTaskResult immediately, and the actual result can be
    retrieved later via tasks/result.

    Task augmentation is subject to capability negotiation - receivers MUST declare support
    for task augmentation of specific request types in their capabilities.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

arguments class-attribute instance-attribute

arguments: dict[str, Any] | None = None

Arguments to use for the tool call.

name instance-attribute

name: str

The name of the tool.

task class-attribute instance-attribute

task: TaskMetadata | None = None

If specified, the caller is requesting task-augmented execution for this request. The request will return a CreateTaskResult immediately, and the actual result can be retrieved later via tasks/result.

Task augmentation is subject to capability negotiation - receivers MUST declare support for task augmentation of specific request types in their capabilities.

CancelTaskRequest

Bases: WireModel

A request to cancel a task.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CancelTaskRequest(WireModel):
    """
    A request to cancel a task.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["tasks/cancel"]
    params: Params

CancelledNotificationParams

Bases: WireModel

Parameters for a notifications/cancelled notification.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CancelledNotificationParams(WireModel):
    """
    Parameters for a `notifications/cancelled` notification.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    reason: str | None = None
    """
    An optional string describing the reason for the cancellation. This MAY be logged or presented to the user.
    """
    request_id: Annotated[RequestId | None, Field(alias="requestId")] = None
    """
    The ID of the request to cancel.

    This MUST correspond to the ID of a request previously issued in the same direction.
    This MUST be provided for cancelling non-task requests.
    This MUST NOT be used for cancelling tasks (use the `tasks/cancel` request instead).
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

reason class-attribute instance-attribute

reason: str | None = None

An optional string describing the reason for the cancellation. This MAY be logged or presented to the user.

request_id class-attribute instance-attribute

request_id: Annotated[
    RequestId | None, Field(alias="requestId")
] = None

The ID of the request to cancel.

This MUST correspond to the ID of a request previously issued in the same direction. This MUST be provided for cancelling non-task requests. This MUST NOT be used for cancelling tasks (use the tasks/cancel request instead).

CompleteRequestParams

Bases: WireModel

Parameters for a completion/complete request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CompleteRequestParams(WireModel):
    """
    Parameters for a `completion/complete` request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    argument: Argument
    """
    The argument's information
    """
    context: Context | None = None
    """
    Additional, optional context for completions
    """
    ref: PromptReference | ResourceTemplateReference

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

argument instance-attribute

argument: Argument

The argument's information

context class-attribute instance-attribute

context: Context | None = None

Additional, optional context for completions

ElicitRequestFormParams

Bases: WireModel

The parameters for a request to elicit non-sensitive information from the user via a form in the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ElicitRequestFormParams(WireModel):
    """
    The parameters for a request to elicit non-sensitive information from the user via a form in the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    message: str
    """
    The message to present to the user describing what information is being requested.
    """
    mode: Literal["form"] = "form"
    """
    The elicitation mode.
    """
    requested_schema: Annotated[RequestedSchema, Field(alias="requestedSchema")]
    """
    A restricted subset of JSON Schema.
    Only top-level properties are allowed, without nesting.
    """
    task: TaskMetadata | None = None
    """
    If specified, the caller is requesting task-augmented execution for this request.
    The request will return a CreateTaskResult immediately, and the actual result can be
    retrieved later via tasks/result.

    Task augmentation is subject to capability negotiation - receivers MUST declare support
    for task augmentation of specific request types in their capabilities.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

message instance-attribute

message: str

The message to present to the user describing what information is being requested.

mode class-attribute instance-attribute

mode: Literal['form'] = 'form'

The elicitation mode.

requested_schema instance-attribute

requested_schema: Annotated[
    RequestedSchema, Field(alias="requestedSchema")
]

A restricted subset of JSON Schema. Only top-level properties are allowed, without nesting.

task class-attribute instance-attribute

task: TaskMetadata | None = None

If specified, the caller is requesting task-augmented execution for this request. The request will return a CreateTaskResult immediately, and the actual result can be retrieved later via tasks/result.

Task augmentation is subject to capability negotiation - receivers MUST declare support for task augmentation of specific request types in their capabilities.

ElicitRequestURLParams

Bases: WireModel

The parameters for a request to elicit information from the user via a URL in the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ElicitRequestURLParams(WireModel):
    """
    The parameters for a request to elicit information from the user via a URL in the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    elicitation_id: Annotated[str, Field(alias="elicitationId")]
    """
    The ID of the elicitation, which must be unique within the context of the server.
    The client MUST treat this ID as an opaque value.
    """
    message: str
    """
    The message to present to the user explaining why the interaction is needed.
    """
    mode: Literal["url"]
    """
    The elicitation mode.
    """
    task: TaskMetadata | None = None
    """
    If specified, the caller is requesting task-augmented execution for this request.
    The request will return a CreateTaskResult immediately, and the actual result can be
    retrieved later via tasks/result.

    Task augmentation is subject to capability negotiation - receivers MUST declare support
    for task augmentation of specific request types in their capabilities.
    """
    url: str
    """
    The URL that the user should navigate to.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

elicitation_id instance-attribute

elicitation_id: Annotated[str, Field(alias="elicitationId")]

The ID of the elicitation, which must be unique within the context of the server. The client MUST treat this ID as an opaque value.

message instance-attribute

message: str

The message to present to the user explaining why the interaction is needed.

mode instance-attribute

mode: Literal['url']

The elicitation mode.

task class-attribute instance-attribute

task: TaskMetadata | None = None

If specified, the caller is requesting task-augmented execution for this request. The request will return a CreateTaskResult immediately, and the actual result can be retrieved later via tasks/result.

Task augmentation is subject to capability negotiation - receivers MUST declare support for task augmentation of specific request types in their capabilities.

url instance-attribute

url: str

The URL that the user should navigate to.

EmbeddedResource

Bases: WireModel

The contents of a resource, embedded into a prompt or tool call result.

It is up to the client how best to render embedded resources for the benefit of the LLM and/or the user.

Source code in src/mcp/types/v2025_11_25/__init__.py

class EmbeddedResource(WireModel):
    """
    The contents of a resource, embedded into a prompt or tool call result.

    It is up to the client how best to render embedded resources for the benefit
    of the LLM and/or the user.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    annotations: Annotations | None = None
    """
    Optional annotations for the client.
    """
    resource: TextResourceContents | BlobResourceContents
    type: Literal["resource"]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

annotations class-attribute instance-attribute

annotations: Annotations | None = None

Optional annotations for the client.

GetPromptRequestParams

Bases: WireModel

Parameters for a prompts/get request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class GetPromptRequestParams(WireModel):
    """
    Parameters for a `prompts/get` request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    arguments: dict[str, str] | None = None
    """
    Arguments to use for templating the prompt.
    """
    name: str
    """
    The name of the prompt or prompt template.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

arguments class-attribute instance-attribute

arguments: dict[str, str] | None = None

Arguments to use for templating the prompt.

name instance-attribute

name: str

The name of the prompt or prompt template.

GetTaskPayloadRequest

Bases: WireModel

A request to retrieve the result of a completed task.

Source code in src/mcp/types/v2025_11_25/__init__.py

class GetTaskPayloadRequest(WireModel):
    """
    A request to retrieve the result of a completed task.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["tasks/result"]
    params: Params2

GetTaskRequest

Bases: WireModel

A request to retrieve the state of a task.

Source code in src/mcp/types/v2025_11_25/__init__.py

class GetTaskRequest(WireModel):
    """
    A request to retrieve the state of a task.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["tasks/get"]
    params: Params3

ImageContent

Bases: WireModel

An image provided to or from an LLM.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ImageContent(WireModel):
    """
    An image provided to or from an LLM.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    annotations: Annotations | None = None
    """
    Optional annotations for the client.
    """
    data: str
    """
    The base64-encoded image data.
    """
    mime_type: Annotated[str, Field(alias="mimeType")]
    """
    The MIME type of the image. Different providers may support different image types.
    """
    type: Literal["image"]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

annotations class-attribute instance-attribute

annotations: Annotations | None = None

Optional annotations for the client.

data instance-attribute

data: str

The base64-encoded image data.

mime_type instance-attribute

mime_type: Annotated[str, Field(alias='mimeType')]

The MIME type of the image. Different providers may support different image types.

InitializeRequestParams

Bases: WireModel

Parameters for an initialize request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class InitializeRequestParams(WireModel):
    """
    Parameters for an `initialize` request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    capabilities: ClientCapabilities
    client_info: Annotated[Implementation, Field(alias="clientInfo")]
    protocol_version: Annotated[str, Field(alias="protocolVersion")]
    """
    The latest version of the Model Context Protocol that the client supports. The client MAY decide to support older versions as well.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

protocol_version instance-attribute

protocol_version: Annotated[
    str, Field(alias="protocolVersion")
]

The latest version of the Model Context Protocol that the client supports. The client MAY decide to support older versions as well.

InitializeResult

Bases: WireModel

After receiving an initialize request from the client, the server sends this response.

Source code in src/mcp/types/v2025_11_25/__init__.py

class InitializeResult(WireModel):
    """
    After receiving an initialize request from the client, the server sends this response.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    capabilities: ServerCapabilities
    instructions: str | None = None
    """
    Instructions describing how to use the server and its features.

    This can be used by clients to improve the LLM's understanding of available tools, resources, etc. It can be thought of like a "hint" to the model. For example, this information MAY be added to the system prompt.
    """
    protocol_version: Annotated[str, Field(alias="protocolVersion")]
    """
    The version of the Model Context Protocol that the server wants to use. This may not match the version that the client requested. If the client cannot support this version, it MUST disconnect.
    """
    server_info: Annotated[Implementation, Field(alias="serverInfo")]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

instructions class-attribute instance-attribute

instructions: str | None = None

Instructions describing how to use the server and its features.

This can be used by clients to improve the LLM's understanding of available tools, resources, etc. It can be thought of like a "hint" to the model. For example, this information MAY be added to the system prompt.

protocol_version instance-attribute

protocol_version: Annotated[
    str, Field(alias="protocolVersion")
]

The version of the Model Context Protocol that the server wants to use. This may not match the version that the client requested. If the client cannot support this version, it MUST disconnect.

InitializedNotification

Bases: WireModel

This notification is sent from the client to the server after initialization has finished.

Source code in src/mcp/types/v2025_11_25/__init__.py

class InitializedNotification(WireModel):
    """
    This notification is sent from the client to the server after initialization has finished.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/initialized"]
    params: NotificationParams | None = None

JSONRPCErrorResponse

Bases: WireModel

A response to a request that indicates an error occurred.

Source code in src/mcp/types/v2025_11_25/__init__.py

class JSONRPCErrorResponse(WireModel):
    """
    A response to a request that indicates an error occurred.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    error: Error
    id: RequestId | None = None
    jsonrpc: Literal["2.0"]

JSONRPCRequest

Bases: WireModel

A request that expects a response.

Source code in src/mcp/types/v2025_11_25/__init__.py

class JSONRPCRequest(WireModel):
    """
    A request that expects a response.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: str
    params: dict[str, Any] | None = None

JSONRPCResultResponse

Bases: WireModel

A successful (non-error) response to a request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class JSONRPCResultResponse(WireModel):
    """
    A successful (non-error) response to a request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    result: Result

ListRootsRequest

Bases: WireModel

Sent from the server to request a list of root URIs from the client. Roots allow servers to ask for specific directories or files to operate on. A common example for roots is providing a set of repositories or directories a server should operate on.

This request is typically used when the server needs to understand the file system structure or access specific locations that the client has permission to read from.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListRootsRequest(WireModel):
    """
    Sent from the server to request a list of root URIs from the client. Roots allow
    servers to ask for specific directories or files to operate on. A common example
    for roots is providing a set of repositories or directories a server should operate
    on.

    This request is typically used when the server needs to understand the file system
    structure or access specific locations that the client has permission to read from.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["roots/list"]
    params: RequestParams | None = None

ListRootsResult

Bases: WireModel

The client's response to a roots/list request from the server. This result contains an array of Root objects, each representing a root directory or file that the server can operate on.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListRootsResult(WireModel):
    """
    The client's response to a roots/list request from the server.
    This result contains an array of Root objects, each representing a root directory
    or file that the server can operate on.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    roots: list[Root]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

LoggingMessageNotification

Bases: WireModel

JSONRPCNotification of a log message passed from server to client. If no logging/setLevel request has been sent from the client, the server MAY decide which messages to send automatically.

Source code in src/mcp/types/v2025_11_25/__init__.py

class LoggingMessageNotification(WireModel):
    """
    JSONRPCNotification of a log message passed from server to client. If no logging/setLevel request has been sent from the client, the server MAY decide which messages to send automatically.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/message"]
    params: LoggingMessageNotificationParams

PaginatedRequestParams

Bases: WireModel

Common parameters for paginated requests.

Source code in src/mcp/types/v2025_11_25/__init__.py

class PaginatedRequestParams(WireModel):
    """
    Common parameters for paginated requests.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    cursor: str | None = None
    """
    An opaque token representing the current pagination position.
    If provided, the server should return results starting after this cursor.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

cursor class-attribute instance-attribute

cursor: str | None = None

An opaque token representing the current pagination position. If provided, the server should return results starting after this cursor.

PingRequest

Bases: WireModel

A ping, issued by either the server or the client, to check that the other party is still alive. The receiver must promptly respond, or else may be disconnected.

Source code in src/mcp/types/v2025_11_25/__init__.py

class PingRequest(WireModel):
    """
    A ping, issued by either the server or the client, to check that the other party is still alive. The receiver must promptly respond, or else may be disconnected.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["ping"]
    params: RequestParams | None = None

PrimitiveSchemaDefinition

Bases: RootModel[StringSchema | NumberSchema | BooleanSchema | UntitledSingleSelectEnumSchema | TitledSingleSelectEnumSchema | UntitledMultiSelectEnumSchema | TitledMultiSelectEnumSchema | LegacyTitledEnumSchema]

Source code in src/mcp/types/v2025_11_25/__init__.py

class PrimitiveSchemaDefinition(
    RootModel[
        StringSchema
        | NumberSchema
        | BooleanSchema
        | UntitledSingleSelectEnumSchema
        | TitledSingleSelectEnumSchema
        | UntitledMultiSelectEnumSchema
        | TitledMultiSelectEnumSchema
        | LegacyTitledEnumSchema
    ]
):
    root: (
        StringSchema
        | NumberSchema
        | BooleanSchema
        | UntitledSingleSelectEnumSchema
        | TitledSingleSelectEnumSchema
        | UntitledMultiSelectEnumSchema
        | TitledMultiSelectEnumSchema
        | LegacyTitledEnumSchema
    )
    """
    Restricted schema definitions that only allow primitive types
    without nested objects or arrays.
    """

root instance-attribute

root: (
    StringSchema
    | NumberSchema
    | BooleanSchema
    | UntitledSingleSelectEnumSchema
    | TitledSingleSelectEnumSchema
    | UntitledMultiSelectEnumSchema
    | TitledMultiSelectEnumSchema
    | LegacyTitledEnumSchema
)

Restricted schema definitions that only allow primitive types without nested objects or arrays.

ProgressNotificationParams

Bases: WireModel

Parameters for a notifications/progress notification.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ProgressNotificationParams(WireModel):
    """
    Parameters for a `notifications/progress` notification.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    message: str | None = None
    """
    An optional message describing the current progress.
    """
    progress: float
    """
    The progress thus far. This should increase every time progress is made, even if the total is unknown.
    """
    progress_token: Annotated[ProgressToken, Field(alias="progressToken")]
    """
    The progress token which was given in the initial request, used to associate this notification with the request that is proceeding.
    """
    total: float | None = None
    """
    Total number of items to process (or total progress required), if known.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

message class-attribute instance-attribute

message: str | None = None

An optional message describing the current progress.

progress instance-attribute

progress: float

The progress thus far. This should increase every time progress is made, even if the total is unknown.

progress_token instance-attribute

progress_token: Annotated[
    ProgressToken, Field(alias="progressToken")
]

The progress token which was given in the initial request, used to associate this notification with the request that is proceeding.

total class-attribute instance-attribute

total: float | None = None

Total number of items to process (or total progress required), if known.

Prompt

Bases: WireModel

A prompt or prompt template that the server offers.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Prompt(WireModel):
    """
    A prompt or prompt template that the server offers.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    arguments: list[PromptArgument] | None = None
    """
    A list of arguments to use for templating the prompt.
    """
    description: str | None = None
    """
    An optional description of what this prompt provides
    """
    icons: list[Icon] | None = None
    """
    Optional set of sized icons that the client can display in a user interface.

    Clients that support rendering icons MUST support at least the following MIME types:
    - `image/png` - PNG images (safe, universal compatibility)
    - `image/jpeg` (and `image/jpg`) - JPEG images (safe, universal compatibility)

    Clients that support rendering icons SHOULD also support:
    - `image/svg+xml` - SVG images (scalable but requires security precautions)
    - `image/webp` - WebP images (modern, efficient format)
    """
    name: str
    """
    Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).
    """
    title: str | None = None
    """
    Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
    even by those unfamiliar with domain-specific terminology.

    If not provided, the name should be used for display (except for Tool,
    where `annotations.title` should be given precedence over using `name`,
    if present).
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

arguments class-attribute instance-attribute

arguments: list[PromptArgument] | None = None

A list of arguments to use for templating the prompt.

description class-attribute instance-attribute

description: str | None = None

An optional description of what this prompt provides

icons class-attribute instance-attribute

icons: list[Icon] | None = None

Optional set of sized icons that the client can display in a user interface.

Clients that support rendering icons MUST support at least the following MIME types: - image/png - PNG images (safe, universal compatibility) - image/jpeg (and image/jpg) - JPEG images (safe, universal compatibility)

Clients that support rendering icons SHOULD also support: - image/svg+xml - SVG images (scalable but requires security precautions) - image/webp - WebP images (modern, efficient format)

name instance-attribute

name: str

Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).

title class-attribute instance-attribute

title: str | None = None

Intended for UI and end-user contexts — optimized to be human-readable and easily understood, even by those unfamiliar with domain-specific terminology.

If not provided, the name should be used for display (except for Tool, where annotations.title should be given precedence over using name, if present).

ReadResourceRequest

Bases: WireModel

Sent from the client to the server, to read a specific resource URI.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ReadResourceRequest(WireModel):
    """
    Sent from the client to the server, to read a specific resource URI.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["resources/read"]
    params: ReadResourceRequestParams

ReadResourceResult

Bases: WireModel

The server's response to a resources/read request from the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ReadResourceResult(WireModel):
    """
    The server's response to a resources/read request from the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    contents: list[TextResourceContents | BlobResourceContents]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

Resource

Bases: WireModel

A known resource that the server is capable of reading.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Resource(WireModel):
    """
    A known resource that the server is capable of reading.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    annotations: Annotations | None = None
    """
    Optional annotations for the client.
    """
    description: str | None = None
    """
    A description of what this resource represents.

    This can be used by clients to improve the LLM's understanding of available resources. It can be thought of like a "hint" to the model.
    """
    icons: list[Icon] | None = None
    """
    Optional set of sized icons that the client can display in a user interface.

    Clients that support rendering icons MUST support at least the following MIME types:
    - `image/png` - PNG images (safe, universal compatibility)
    - `image/jpeg` (and `image/jpg`) - JPEG images (safe, universal compatibility)

    Clients that support rendering icons SHOULD also support:
    - `image/svg+xml` - SVG images (scalable but requires security precautions)
    - `image/webp` - WebP images (modern, efficient format)
    """
    mime_type: Annotated[str | None, Field(alias="mimeType")] = None
    """
    The MIME type of this resource, if known.
    """
    name: str
    """
    Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).
    """
    size: int | None = None
    """
    The size of the raw resource content, in bytes (i.e., before base64 encoding or any tokenization), if known.

    This can be used by Hosts to display file sizes and estimate context window usage.
    """
    title: str | None = None
    """
    Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
    even by those unfamiliar with domain-specific terminology.

    If not provided, the name should be used for display (except for Tool,
    where `annotations.title` should be given precedence over using `name`,
    if present).
    """
    uri: str
    """
    The URI of this resource.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

annotations class-attribute instance-attribute

annotations: Annotations | None = None

Optional annotations for the client.

description class-attribute instance-attribute

description: str | None = None

A description of what this resource represents.

This can be used by clients to improve the LLM's understanding of available resources. It can be thought of like a "hint" to the model.

icons class-attribute instance-attribute

icons: list[Icon] | None = None

Optional set of sized icons that the client can display in a user interface.

Clients that support rendering icons MUST support at least the following MIME types: - image/png - PNG images (safe, universal compatibility) - image/jpeg (and image/jpg) - JPEG images (safe, universal compatibility)

Clients that support rendering icons SHOULD also support: - image/svg+xml - SVG images (scalable but requires security precautions) - image/webp - WebP images (modern, efficient format)

mime_type class-attribute instance-attribute

mime_type: Annotated[
    str | None, Field(alias="mimeType")
] = None

The MIME type of this resource, if known.

name instance-attribute

name: str

Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).

size class-attribute instance-attribute

size: int | None = None

The size of the raw resource content, in bytes (i.e., before base64 encoding or any tokenization), if known.

This can be used by Hosts to display file sizes and estimate context window usage.

title class-attribute instance-attribute

title: str | None = None

Intended for UI and end-user contexts — optimized to be human-readable and easily understood, even by those unfamiliar with domain-specific terminology.

If not provided, the name should be used for display (except for Tool, where annotations.title should be given precedence over using name, if present).

uri instance-attribute

uri: str

The URI of this resource.

ResourceLink

Bases: WireModel

A resource that the server is capable of reading, included in a prompt or tool call result.

Note: resource links returned by tools are not guaranteed to appear in the results of resources/list requests.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ResourceLink(WireModel):
    """
    A resource that the server is capable of reading, included in a prompt or tool call result.

    Note: resource links returned by tools are not guaranteed to appear in the results of `resources/list` requests.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    annotations: Annotations | None = None
    """
    Optional annotations for the client.
    """
    description: str | None = None
    """
    A description of what this resource represents.

    This can be used by clients to improve the LLM's understanding of available resources. It can be thought of like a "hint" to the model.
    """
    icons: list[Icon] | None = None
    """
    Optional set of sized icons that the client can display in a user interface.

    Clients that support rendering icons MUST support at least the following MIME types:
    - `image/png` - PNG images (safe, universal compatibility)
    - `image/jpeg` (and `image/jpg`) - JPEG images (safe, universal compatibility)

    Clients that support rendering icons SHOULD also support:
    - `image/svg+xml` - SVG images (scalable but requires security precautions)
    - `image/webp` - WebP images (modern, efficient format)
    """
    mime_type: Annotated[str | None, Field(alias="mimeType")] = None
    """
    The MIME type of this resource, if known.
    """
    name: str
    """
    Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).
    """
    size: int | None = None
    """
    The size of the raw resource content, in bytes (i.e., before base64 encoding or any tokenization), if known.

    This can be used by Hosts to display file sizes and estimate context window usage.
    """
    title: str | None = None
    """
    Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
    even by those unfamiliar with domain-specific terminology.

    If not provided, the name should be used for display (except for Tool,
    where `annotations.title` should be given precedence over using `name`,
    if present).
    """
    type: Literal["resource_link"]
    uri: str
    """
    The URI of this resource.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

annotations class-attribute instance-attribute

annotations: Annotations | None = None

Optional annotations for the client.

description class-attribute instance-attribute

description: str | None = None

A description of what this resource represents.

This can be used by clients to improve the LLM's understanding of available resources. It can be thought of like a "hint" to the model.

icons class-attribute instance-attribute

icons: list[Icon] | None = None

Optional set of sized icons that the client can display in a user interface.

Clients that support rendering icons MUST support at least the following MIME types: - image/png - PNG images (safe, universal compatibility) - image/jpeg (and image/jpg) - JPEG images (safe, universal compatibility)

Clients that support rendering icons SHOULD also support: - image/svg+xml - SVG images (scalable but requires security precautions) - image/webp - WebP images (modern, efficient format)

mime_type class-attribute instance-attribute

mime_type: Annotated[
    str | None, Field(alias="mimeType")
] = None

The MIME type of this resource, if known.

name instance-attribute

name: str

Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).

size class-attribute instance-attribute

size: int | None = None

The size of the raw resource content, in bytes (i.e., before base64 encoding or any tokenization), if known.

This can be used by Hosts to display file sizes and estimate context window usage.

title class-attribute instance-attribute

title: str | None = None

Intended for UI and end-user contexts — optimized to be human-readable and easily understood, even by those unfamiliar with domain-specific terminology.

If not provided, the name should be used for display (except for Tool, where annotations.title should be given precedence over using name, if present).

uri instance-attribute

uri: str

The URI of this resource.

ResourceTemplate

Bases: WireModel

A template description for resources available on the server.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ResourceTemplate(WireModel):
    """
    A template description for resources available on the server.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    annotations: Annotations | None = None
    """
    Optional annotations for the client.
    """
    description: str | None = None
    """
    A description of what this template is for.

    This can be used by clients to improve the LLM's understanding of available resources. It can be thought of like a "hint" to the model.
    """
    icons: list[Icon] | None = None
    """
    Optional set of sized icons that the client can display in a user interface.

    Clients that support rendering icons MUST support at least the following MIME types:
    - `image/png` - PNG images (safe, universal compatibility)
    - `image/jpeg` (and `image/jpg`) - JPEG images (safe, universal compatibility)

    Clients that support rendering icons SHOULD also support:
    - `image/svg+xml` - SVG images (scalable but requires security precautions)
    - `image/webp` - WebP images (modern, efficient format)
    """
    mime_type: Annotated[str | None, Field(alias="mimeType")] = None
    """
    The MIME type for all resources that match this template. This should only be included if all resources matching this template have the same type.
    """
    name: str
    """
    Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).
    """
    title: str | None = None
    """
    Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
    even by those unfamiliar with domain-specific terminology.

    If not provided, the name should be used for display (except for Tool,
    where `annotations.title` should be given precedence over using `name`,
    if present).
    """
    uri_template: Annotated[str, Field(alias="uriTemplate")]
    """
    A URI template (according to RFC 6570) that can be used to construct resource URIs.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

annotations class-attribute instance-attribute

annotations: Annotations | None = None

Optional annotations for the client.

description class-attribute instance-attribute

description: str | None = None

A description of what this template is for.

This can be used by clients to improve the LLM's understanding of available resources. It can be thought of like a "hint" to the model.

icons class-attribute instance-attribute

icons: list[Icon] | None = None

Optional set of sized icons that the client can display in a user interface.

Clients that support rendering icons MUST support at least the following MIME types: - image/png - PNG images (safe, universal compatibility) - image/jpeg (and image/jpg) - JPEG images (safe, universal compatibility)

Clients that support rendering icons SHOULD also support: - image/svg+xml - SVG images (scalable but requires security precautions) - image/webp - WebP images (modern, efficient format)

mime_type class-attribute instance-attribute

mime_type: Annotated[
    str | None, Field(alias="mimeType")
] = None

The MIME type for all resources that match this template. This should only be included if all resources matching this template have the same type.

name instance-attribute

name: str

Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).

title class-attribute instance-attribute

title: str | None = None

Intended for UI and end-user contexts — optimized to be human-readable and easily understood, even by those unfamiliar with domain-specific terminology.

If not provided, the name should be used for display (except for Tool, where annotations.title should be given precedence over using name, if present).

uri_template instance-attribute

uri_template: Annotated[str, Field(alias='uriTemplate')]

A URI template (according to RFC 6570) that can be used to construct resource URIs.

ResourceUpdatedNotification

Bases: WireModel

A notification from the server to the client, informing it that a resource has changed and may need to be read again. This should only be sent if the client previously sent a resources/subscribe request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ResourceUpdatedNotification(WireModel):
    """
    A notification from the server to the client, informing it that a resource has changed and may need to be read again. This should only be sent if the client previously sent a resources/subscribe request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/resources/updated"]
    params: ResourceUpdatedNotificationParams

SetLevelRequest

Bases: WireModel

A request from the client to the server, to enable or adjust logging.

Source code in src/mcp/types/v2025_11_25/__init__.py

class SetLevelRequest(WireModel):
    """
    A request from the client to the server, to enable or adjust logging.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["logging/setLevel"]
    params: SetLevelRequestParams

SubscribeRequest

Bases: WireModel

Sent from the client to request resources/updated notifications from the server whenever a particular resource changes.

Source code in src/mcp/types/v2025_11_25/__init__.py

class SubscribeRequest(WireModel):
    """
    Sent from the client to request resources/updated notifications from the server whenever a particular resource changes.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["resources/subscribe"]
    params: SubscribeRequestParams

Task

Bases: WireModel

Data associated with a task.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Task(WireModel):
    """
    Data associated with a task.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    created_at: Annotated[str, Field(alias="createdAt")]
    """
    ISO 8601 timestamp when the task was created.
    """
    last_updated_at: Annotated[str, Field(alias="lastUpdatedAt")]
    """
    ISO 8601 timestamp when the task was last updated.
    """
    poll_interval: Annotated[int | None, Field(alias="pollInterval")] = None
    """
    Suggested polling interval in milliseconds.
    """
    status: TaskStatus
    """
    Current task state.
    """
    status_message: Annotated[str | None, Field(alias="statusMessage")] = None
    """
    Optional human-readable message describing the current task state.
    This can provide context for any status, including:
    - Reasons for "cancelled" status
    - Summaries for "completed" status
    - Diagnostic information for "failed" status (e.g., error details, what went wrong)
    """
    task_id: Annotated[str, Field(alias="taskId")]
    """
    The task identifier.
    """
    ttl: int | None
    """
    Actual retention duration from creation in milliseconds, null for unlimited.
    """

created_at instance-attribute

created_at: Annotated[str, Field(alias='createdAt')]

ISO 8601 timestamp when the task was created.

last_updated_at instance-attribute

last_updated_at: Annotated[
    str, Field(alias="lastUpdatedAt")
]

ISO 8601 timestamp when the task was last updated.

poll_interval class-attribute instance-attribute

poll_interval: Annotated[
    int | None, Field(alias="pollInterval")
] = None

Suggested polling interval in milliseconds.

status instance-attribute

status: TaskStatus

Current task state.

status_message class-attribute instance-attribute

status_message: Annotated[
    str | None, Field(alias="statusMessage")
] = None

Optional human-readable message describing the current task state. This can provide context for any status, including: - Reasons for "cancelled" status - Summaries for "completed" status - Diagnostic information for "failed" status (e.g., error details, what went wrong)

task_id instance-attribute

task_id: Annotated[str, Field(alias='taskId')]

The task identifier.

ttl instance-attribute

ttl: int | None

Actual retention duration from creation in milliseconds, null for unlimited.

TaskAugmentedRequestParams

Bases: WireModel

Common params for any task-augmented request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class TaskAugmentedRequestParams(WireModel):
    """
    Common params for any task-augmented request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    task: TaskMetadata | None = None
    """
    If specified, the caller is requesting task-augmented execution for this request.
    The request will return a CreateTaskResult immediately, and the actual result can be
    retrieved later via tasks/result.

    Task augmentation is subject to capability negotiation - receivers MUST declare support
    for task augmentation of specific request types in their capabilities.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

task class-attribute instance-attribute

task: TaskMetadata | None = None

If specified, the caller is requesting task-augmented execution for this request. The request will return a CreateTaskResult immediately, and the actual result can be retrieved later via tasks/result.

Task augmentation is subject to capability negotiation - receivers MUST declare support for task augmentation of specific request types in their capabilities.

TaskStatusNotificationParams

Bases: NotificationParams, Task

Parameters for a notifications/tasks/status notification.

Source code in src/mcp/types/v2025_11_25/__init__.py

class TaskStatusNotificationParams(NotificationParams, Task):
    """
    Parameters for a `notifications/tasks/status` notification.
    """

    model_config = ConfigDict(
        extra="ignore",
    )

TextContent

Bases: WireModel

Text provided to or from an LLM.

Source code in src/mcp/types/v2025_11_25/__init__.py

class TextContent(WireModel):
    """
    Text provided to or from an LLM.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    annotations: Annotations | None = None
    """
    Optional annotations for the client.
    """
    text: str
    """
    The text content of the message.
    """
    type: Literal["text"]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

annotations class-attribute instance-attribute

annotations: Annotations | None = None

Optional annotations for the client.

text instance-attribute

text: str

The text content of the message.

Tool

Bases: WireModel

Definition for a tool the client can call.

Source code in src/mcp/types/v2025_11_25/__init__.py

class Tool(WireModel):
    """
    Definition for a tool the client can call.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    annotations: ToolAnnotations | None = None
    """
    Optional additional tool information.

    Display name precedence order is: title, annotations.title, then name.
    """
    description: str | None = None
    """
    A human-readable description of the tool.

    This can be used by clients to improve the LLM's understanding of available tools. It can be thought of like a "hint" to the model.
    """
    execution: ToolExecution | None = None
    """
    Execution-related properties for this tool.
    """
    icons: list[Icon] | None = None
    """
    Optional set of sized icons that the client can display in a user interface.

    Clients that support rendering icons MUST support at least the following MIME types:
    - `image/png` - PNG images (safe, universal compatibility)
    - `image/jpeg` (and `image/jpg`) - JPEG images (safe, universal compatibility)

    Clients that support rendering icons SHOULD also support:
    - `image/svg+xml` - SVG images (scalable but requires security precautions)
    - `image/webp` - WebP images (modern, efficient format)
    """
    input_schema: Annotated[InputSchema, Field(alias="inputSchema")]
    """
    A JSON Schema object defining the expected parameters for the tool.
    """
    name: str
    """
    Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).
    """
    output_schema: Annotated[OutputSchema | None, Field(alias="outputSchema")] = None
    """
    An optional JSON Schema object defining the structure of the tool's output returned in
    the structuredContent field of a CallToolResult.

    Defaults to JSON Schema 2020-12 when no explicit $schema is provided.
    Currently restricted to type: "object" at the root level.
    """
    title: str | None = None
    """
    Intended for UI and end-user contexts — optimized to be human-readable and easily understood,
    even by those unfamiliar with domain-specific terminology.

    If not provided, the name should be used for display (except for Tool,
    where `annotations.title` should be given precedence over using `name`,
    if present).
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

annotations class-attribute instance-attribute

annotations: ToolAnnotations | None = None

Optional additional tool information.

Display name precedence order is: title, annotations.title, then name.

description class-attribute instance-attribute

description: str | None = None

A human-readable description of the tool.

This can be used by clients to improve the LLM's understanding of available tools. It can be thought of like a "hint" to the model.

execution class-attribute instance-attribute

execution: ToolExecution | None = None

Execution-related properties for this tool.

icons class-attribute instance-attribute

icons: list[Icon] | None = None

Optional set of sized icons that the client can display in a user interface.

Clients that support rendering icons MUST support at least the following MIME types: - image/png - PNG images (safe, universal compatibility) - image/jpeg (and image/jpg) - JPEG images (safe, universal compatibility)

Clients that support rendering icons SHOULD also support: - image/svg+xml - SVG images (scalable but requires security precautions) - image/webp - WebP images (modern, efficient format)

input_schema instance-attribute

input_schema: Annotated[
    InputSchema, Field(alias="inputSchema")
]

A JSON Schema object defining the expected parameters for the tool.

name instance-attribute

name: str

Intended for programmatic or logical use, but used as a display name in past specs or fallback (if title isn't present).

output_schema class-attribute instance-attribute

output_schema: Annotated[
    OutputSchema | None, Field(alias="outputSchema")
] = None

An optional JSON Schema object defining the structure of the tool's output returned in the structuredContent field of a CallToolResult.

Defaults to JSON Schema 2020-12 when no explicit $schema is provided. Currently restricted to type: "object" at the root level.

title class-attribute instance-attribute

title: str | None = None

Intended for UI and end-user contexts — optimized to be human-readable and easily understood, even by those unfamiliar with domain-specific terminology.

If not provided, the name should be used for display (except for Tool, where annotations.title should be given precedence over using name, if present).

Data

Bases: WireModel

Additional information about the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.).

Source code in src/mcp/types/v2025_11_25/__init__.py

class Data(WireModel):
    """
    Additional information about the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.).
    """

    model_config = ConfigDict(
        extra="allow",
    )
    elicitations: list[ElicitRequestURLParams]

Error1

Bases: Error

Source code in src/mcp/types/v2025_11_25/__init__.py

class Error1(Error):
    model_config = ConfigDict(
        extra="ignore",
    )
    code: Literal[-32042]
    """
    The error type that occurred.
    """
    data: Data
    """
    Additional information about the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.).
    """

code instance-attribute

code: Literal[-32042]

The error type that occurred.

data instance-attribute

data: Data

Additional information about the error. The value of this member is defined by the sender (e.g. detailed error information, nested errors etc.).

URLElicitationRequiredError

Bases: WireModel

An error response that indicates that the server requires the client to provide additional information via an elicitation request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class URLElicitationRequiredError(WireModel):
    """
    An error response that indicates that the server requires the client to provide additional information via an elicitation request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    error: Error1
    id: RequestId | None = None
    jsonrpc: Literal["2.0"]

UnsubscribeRequest

Bases: WireModel

Sent from the client to request cancellation of resources/updated notifications from the server. This should follow a previous resources/subscribe request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class UnsubscribeRequest(WireModel):
    """
    Sent from the client to request cancellation of resources/updated notifications from the server. This should follow a previous resources/subscribe request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["resources/unsubscribe"]
    params: UnsubscribeRequestParams

CallToolRequest

Bases: WireModel

Used by the client to invoke a tool provided by the server.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CallToolRequest(WireModel):
    """
    Used by the client to invoke a tool provided by the server.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["tools/call"]
    params: CallToolRequestParams

CancelTaskResult

Bases: Result, Task

The response to a tasks/cancel request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CancelTaskResult(Result, Task):
    """
    The response to a tasks/cancel request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )

CancelledNotification

Bases: WireModel

This notification can be sent by either side to indicate that it is cancelling a previously-issued request.

The request SHOULD still be in-flight, but due to communication latency, it is always possible that this notification MAY arrive after the request has already finished.

This notification indicates that the result will be unused, so any associated processing SHOULD cease.

A client MUST NOT attempt to cancel its initialize request.

For task cancellation, use the tasks/cancel request instead of this notification.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CancelledNotification(WireModel):
    """
    This notification can be sent by either side to indicate that it is cancelling a previously-issued request.

    The request SHOULD still be in-flight, but due to communication latency, it is always possible that this notification MAY arrive after the request has already finished.

    This notification indicates that the result will be unused, so any associated processing SHOULD cease.

    A client MUST NOT attempt to cancel its `initialize` request.

    For task cancellation, use the `tasks/cancel` request instead of this notification.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/cancelled"]
    params: CancelledNotificationParams

CompleteRequest

Bases: WireModel

A request from the client to the server, to ask for completion options.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CompleteRequest(WireModel):
    """
    A request from the client to the server, to ask for completion options.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["completion/complete"]
    params: CompleteRequestParams

CreateTaskResult

Bases: WireModel

A response to a task-augmented request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CreateTaskResult(WireModel):
    """
    A response to a task-augmented request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    task: Task

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

ElicitRequestParams

Bases: RootModel[ElicitRequestURLParams | ElicitRequestFormParams]

Source code in src/mcp/types/v2025_11_25/__init__.py

class ElicitRequestParams(RootModel[ElicitRequestURLParams | ElicitRequestFormParams]):
    root: ElicitRequestURLParams | ElicitRequestFormParams
    """
    The parameters for a request to elicit additional information from the user via the client.
    """

root instance-attribute

root: ElicitRequestURLParams | ElicitRequestFormParams

The parameters for a request to elicit additional information from the user via the client.

GetPromptRequest

Bases: WireModel

Used by the client to get a prompt provided by the server.

Source code in src/mcp/types/v2025_11_25/__init__.py

class GetPromptRequest(WireModel):
    """
    Used by the client to get a prompt provided by the server.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["prompts/get"]
    params: GetPromptRequestParams

GetTaskResult

Bases: Result, Task

The response to a tasks/get request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class GetTaskResult(Result, Task):
    """
    The response to a tasks/get request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )

InitializeRequest

Bases: WireModel

This request is sent from the client to the server when it first connects, asking it to begin initialization.

Source code in src/mcp/types/v2025_11_25/__init__.py

class InitializeRequest(WireModel):
    """
    This request is sent from the client to the server when it first connects, asking it to begin initialization.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["initialize"]
    params: InitializeRequestParams

JSONRPCMessage

Bases: RootModel[JSONRPCRequest | JSONRPCNotification | JSONRPCResultResponse | JSONRPCErrorResponse]

Source code in src/mcp/types/v2025_11_25/__init__.py

class JSONRPCMessage(RootModel[JSONRPCRequest | JSONRPCNotification | JSONRPCResultResponse | JSONRPCErrorResponse]):
    root: JSONRPCRequest | JSONRPCNotification | JSONRPCResultResponse | JSONRPCErrorResponse
    """
    Refers to any valid JSON-RPC object that can be decoded off the wire, or encoded to be sent.
    """

root instance-attribute

root: (
    JSONRPCRequest
    | JSONRPCNotification
    | JSONRPCResultResponse
    | JSONRPCErrorResponse
)

Refers to any valid JSON-RPC object that can be decoded off the wire, or encoded to be sent.

JSONRPCResponse

Bases: RootModel[JSONRPCResultResponse | JSONRPCErrorResponse]

Source code in src/mcp/types/v2025_11_25/__init__.py

class JSONRPCResponse(RootModel[JSONRPCResultResponse | JSONRPCErrorResponse]):
    root: JSONRPCResultResponse | JSONRPCErrorResponse
    """
    A response to a request, containing either the result or error.
    """

root instance-attribute

root: JSONRPCResultResponse | JSONRPCErrorResponse

A response to a request, containing either the result or error.

ListPromptsRequest

Bases: WireModel

Sent from the client to request a list of prompts and prompt templates the server has.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListPromptsRequest(WireModel):
    """
    Sent from the client to request a list of prompts and prompt templates the server has.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["prompts/list"]
    params: PaginatedRequestParams | None = None

ListPromptsResult

Bases: WireModel

The server's response to a prompts/list request from the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListPromptsResult(WireModel):
    """
    The server's response to a prompts/list request from the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    next_cursor: Annotated[str | None, Field(alias="nextCursor")] = None
    """
    An opaque token representing the pagination position after the last returned result.
    If present, there may be more results available.
    """
    prompts: list[Prompt]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

next_cursor class-attribute instance-attribute

next_cursor: Annotated[
    str | None, Field(alias="nextCursor")
] = None

An opaque token representing the pagination position after the last returned result. If present, there may be more results available.

ListResourceTemplatesRequest

Bases: WireModel

Sent from the client to request a list of resource templates the server has.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListResourceTemplatesRequest(WireModel):
    """
    Sent from the client to request a list of resource templates the server has.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["resources/templates/list"]
    params: PaginatedRequestParams | None = None

ListResourceTemplatesResult

Bases: WireModel

The server's response to a resources/templates/list request from the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListResourceTemplatesResult(WireModel):
    """
    The server's response to a resources/templates/list request from the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    next_cursor: Annotated[str | None, Field(alias="nextCursor")] = None
    """
    An opaque token representing the pagination position after the last returned result.
    If present, there may be more results available.
    """
    resource_templates: Annotated[list[ResourceTemplate], Field(alias="resourceTemplates")]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

next_cursor class-attribute instance-attribute

next_cursor: Annotated[
    str | None, Field(alias="nextCursor")
] = None

An opaque token representing the pagination position after the last returned result. If present, there may be more results available.

ListResourcesRequest

Bases: WireModel

Sent from the client to request a list of resources the server has.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListResourcesRequest(WireModel):
    """
    Sent from the client to request a list of resources the server has.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["resources/list"]
    params: PaginatedRequestParams | None = None

ListResourcesResult

Bases: WireModel

The server's response to a resources/list request from the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListResourcesResult(WireModel):
    """
    The server's response to a resources/list request from the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    next_cursor: Annotated[str | None, Field(alias="nextCursor")] = None
    """
    An opaque token representing the pagination position after the last returned result.
    If present, there may be more results available.
    """
    resources: list[Resource]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

next_cursor class-attribute instance-attribute

next_cursor: Annotated[
    str | None, Field(alias="nextCursor")
] = None

An opaque token representing the pagination position after the last returned result. If present, there may be more results available.

ListTasksRequest

Bases: WireModel

A request to retrieve a list of tasks.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListTasksRequest(WireModel):
    """
    A request to retrieve a list of tasks.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["tasks/list"]
    params: PaginatedRequestParams | None = None

ListTasksResult

Bases: WireModel

The response to a tasks/list request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListTasksResult(WireModel):
    """
    The response to a tasks/list request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    next_cursor: Annotated[str | None, Field(alias="nextCursor")] = None
    """
    An opaque token representing the pagination position after the last returned result.
    If present, there may be more results available.
    """
    tasks: list[Task]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

next_cursor class-attribute instance-attribute

next_cursor: Annotated[
    str | None, Field(alias="nextCursor")
] = None

An opaque token representing the pagination position after the last returned result. If present, there may be more results available.

ListToolsRequest

Bases: WireModel

Sent from the client to request a list of tools the server has.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListToolsRequest(WireModel):
    """
    Sent from the client to request a list of tools the server has.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["tools/list"]
    params: PaginatedRequestParams | None = None

ListToolsResult

Bases: WireModel

The server's response to a tools/list request from the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ListToolsResult(WireModel):
    """
    The server's response to a tools/list request from the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    next_cursor: Annotated[str | None, Field(alias="nextCursor")] = None
    """
    An opaque token representing the pagination position after the last returned result.
    If present, there may be more results available.
    """
    tools: list[Tool]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

next_cursor class-attribute instance-attribute

next_cursor: Annotated[
    str | None, Field(alias="nextCursor")
] = None

An opaque token representing the pagination position after the last returned result. If present, there may be more results available.

ProgressNotification

Bases: WireModel

An out-of-band notification used to inform the receiver of a progress update for a long-running request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ProgressNotification(WireModel):
    """
    An out-of-band notification used to inform the receiver of a progress update for a long-running request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/progress"]
    params: ProgressNotificationParams

PromptMessage

Bases: WireModel

Describes a message returned as part of a prompt.

This is similar to SamplingMessage, but also supports the embedding of resources from the MCP server.

Source code in src/mcp/types/v2025_11_25/__init__.py

class PromptMessage(WireModel):
    """
    Describes a message returned as part of a prompt.

    This is similar to `SamplingMessage`, but also supports the embedding of
    resources from the MCP server.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    content: ContentBlock
    role: Role

TaskStatusNotification

Bases: WireModel

An optional notification from the receiver to the requestor, informing them that a task's status has changed. Receivers are not required to send these notifications.

Source code in src/mcp/types/v2025_11_25/__init__.py

class TaskStatusNotification(WireModel):
    """
    An optional notification from the receiver to the requestor, informing them that a task's status has changed. Receivers are not required to send these notifications.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    jsonrpc: Literal["2.0"]
    method: Literal["notifications/tasks/status"]
    params: TaskStatusNotificationParams

ToolResultContent

Bases: WireModel

The result of a tool use, provided by the user back to the assistant.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ToolResultContent(WireModel):
    """
    The result of a tool use, provided by the user back to the assistant.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    Optional metadata about the tool result. Clients SHOULD preserve this field when
    including tool results in subsequent sampling requests to enable caching optimizations.

    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    content: list[ContentBlock]
    """
    The unstructured result content of the tool use.

    This has the same format as CallToolResult.content and can include text, images,
    audio, resource links, and embedded resources.
    """
    is_error: Annotated[bool | None, Field(alias="isError")] = None
    """
    Whether the tool use resulted in an error.

    If true, the content typically describes the error that occurred.
    Default: false
    """
    structured_content: Annotated[dict[str, Any] | None, Field(alias="structuredContent")] = None
    """
    An optional structured result object.

    If the tool defined an outputSchema, this SHOULD conform to that schema.
    """
    tool_use_id: Annotated[str, Field(alias="toolUseId")]
    """
    The ID of the tool use this result corresponds to.

    This MUST match the ID from a previous ToolUseContent.
    """
    type: Literal["tool_result"]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

Optional metadata about the tool result. Clients SHOULD preserve this field when including tool results in subsequent sampling requests to enable caching optimizations.

See General fields: _meta for notes on _meta usage.

content instance-attribute

content: list[ContentBlock]

The unstructured result content of the tool use.

This has the same format as CallToolResult.content and can include text, images, audio, resource links, and embedded resources.

is_error class-attribute instance-attribute

is_error: Annotated[bool | None, Field(alias="isError")] = (
    None
)

Whether the tool use resulted in an error.

If true, the content typically describes the error that occurred. Default: false

structured_content class-attribute instance-attribute

structured_content: Annotated[
    dict[str, Any] | None, Field(alias="structuredContent")
] = None

An optional structured result object.

If the tool defined an outputSchema, this SHOULD conform to that schema.

tool_use_id instance-attribute

tool_use_id: Annotated[str, Field(alias='toolUseId')]

The ID of the tool use this result corresponds to.

This MUST match the ID from a previous ToolUseContent.

CallToolResult

Bases: WireModel

The server's response to a tool call.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CallToolResult(WireModel):
    """
    The server's response to a tool call.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    content: list[ContentBlock]
    """
    A list of content objects that represent the unstructured result of the tool call.
    """
    is_error: Annotated[bool | None, Field(alias="isError")] = None
    """
    Whether the tool call ended in an error.

    If not set, this is assumed to be false (the call was successful).

    Any errors that originate from the tool SHOULD be reported inside the result
    object, with `isError` set to true, _not_ as an MCP protocol-level error
    response. Otherwise, the LLM would not be able to see that an error occurred
    and self-correct.

    However, any errors in _finding_ the tool, an error indicating that the
    server does not support tool calls, or any other exceptional conditions,
    should be reported as an MCP error response.
    """
    structured_content: Annotated[dict[str, Any] | None, Field(alias="structuredContent")] = None
    """
    An optional JSON object that represents the structured result of the tool call.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

content instance-attribute

content: list[ContentBlock]

A list of content objects that represent the unstructured result of the tool call.

is_error class-attribute instance-attribute

is_error: Annotated[bool | None, Field(alias="isError")] = (
    None
)

Whether the tool call ended in an error.

If not set, this is assumed to be false (the call was successful).

Any errors that originate from the tool SHOULD be reported inside the result object, with isError set to true, not as an MCP protocol-level error response. Otherwise, the LLM would not be able to see that an error occurred and self-correct.

However, any errors in finding the tool, an error indicating that the server does not support tool calls, or any other exceptional conditions, should be reported as an MCP error response.

structured_content class-attribute instance-attribute

structured_content: Annotated[
    dict[str, Any] | None, Field(alias="structuredContent")
] = None

An optional JSON object that represents the structured result of the tool call.

ElicitRequest

Bases: WireModel

A request from the server to elicit additional information from the user via the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class ElicitRequest(WireModel):
    """
    A request from the server to elicit additional information from the user via the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["elicitation/create"]
    params: ElicitRequestParams

GetPromptResult

Bases: WireModel

The server's response to a prompts/get request from the client.

Source code in src/mcp/types/v2025_11_25/__init__.py

class GetPromptResult(WireModel):
    """
    The server's response to a prompts/get request from the client.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    description: str | None = None
    """
    An optional description for the prompt.
    """
    messages: list[PromptMessage]

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

description class-attribute instance-attribute

description: str | None = None

An optional description for the prompt.

CreateMessageResult

Bases: WireModel

The client's response to a sampling/createMessage request from the server. The client should inform the user before returning the sampled message, to allow them to inspect the response (human in the loop) and decide whether to allow the server to see it.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CreateMessageResult(WireModel):
    """
    The client's response to a sampling/createMessage request from the server.
    The client should inform the user before returning the sampled message, to allow them
    to inspect the response (human in the loop) and decide whether to allow the server to see it.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    content: (
        TextContent
        | ImageContent
        | AudioContent
        | ToolUseContent
        | ToolResultContent
        | list[SamplingMessageContentBlock]
    )
    model: str
    """
    The name of the model that generated the message.
    """
    role: Role
    stop_reason: Annotated[str | None, Field(alias="stopReason")] = None
    """
    The reason why sampling stopped, if known.

    Standard values:
    - "endTurn": Natural end of the assistant's turn
    - "stopSequence": A stop sequence was encountered
    - "maxTokens": Maximum token limit was reached
    - "toolUse": The model wants to use one or more tools

    This field is an open string to allow for provider-specific stop reasons.
    """

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

model instance-attribute

model: str

The name of the model that generated the message.

stop_reason class-attribute instance-attribute

stop_reason: Annotated[
    str | None, Field(alias="stopReason")
] = None

The reason why sampling stopped, if known.

Standard values: - "endTurn": Natural end of the assistant's turn - "stopSequence": A stop sequence was encountered - "maxTokens": Maximum token limit was reached - "toolUse": The model wants to use one or more tools

This field is an open string to allow for provider-specific stop reasons.

SamplingMessage

Bases: WireModel

Describes a message issued to or received from an LLM API.

Source code in src/mcp/types/v2025_11_25/__init__.py

class SamplingMessage(WireModel):
    """
    Describes a message issued to or received from an LLM API.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[dict[str, Any] | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    content: (
        TextContent
        | ImageContent
        | AudioContent
        | ToolUseContent
        | ToolResultContent
        | list[SamplingMessageContentBlock]
    )
    role: Role

meta class-attribute instance-attribute

meta: Annotated[
    dict[str, Any] | None, Field(alias="_meta")
] = None

See General fields: _meta for notes on _meta usage.

CreateMessageRequestParams

Bases: WireModel

Parameters for a sampling/createMessage request.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CreateMessageRequestParams(WireModel):
    """
    Parameters for a `sampling/createMessage` request.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    meta: Annotated[Meta | None, Field(alias="_meta")] = None
    """
    See [General fields: `_meta`](https://modelcontextprotocol.io/specification/2025-11-25/basic/index#meta) for notes on `_meta` usage.
    """
    include_context: Annotated[
        Literal["allServers", "none", "thisServer"] | None,
        Field(alias="includeContext"),
    ] = None
    """
    A request to include context from one or more MCP servers (including the caller), to be attached to the prompt.
    The client MAY ignore this request.

    Default is "none". Values "thisServer" and "allServers" are soft-deprecated. Servers SHOULD only use these values if the client
    declares ClientCapabilities.sampling.context. These values may be removed in future spec releases.
    """
    max_tokens: Annotated[int, Field(alias="maxTokens")]
    """
    The requested maximum number of tokens to sample (to prevent runaway completions).

    The client MAY choose to sample fewer tokens than the requested maximum.
    """
    messages: list[SamplingMessage]
    metadata: dict[str, Any] | None = None
    """
    Optional metadata to pass through to the LLM provider. The format of this metadata is provider-specific.
    """
    model_preferences: Annotated[ModelPreferences | None, Field(alias="modelPreferences")] = None
    """
    The server's preferences for which model to select. The client MAY ignore these preferences.
    """
    stop_sequences: Annotated[list[str] | None, Field(alias="stopSequences")] = None
    system_prompt: Annotated[str | None, Field(alias="systemPrompt")] = None
    """
    An optional system prompt the server wants to use for sampling. The client MAY modify or omit this prompt.
    """
    task: TaskMetadata | None = None
    """
    If specified, the caller is requesting task-augmented execution for this request.
    The request will return a CreateTaskResult immediately, and the actual result can be
    retrieved later via tasks/result.

    Task augmentation is subject to capability negotiation - receivers MUST declare support
    for task augmentation of specific request types in their capabilities.
    """
    temperature: float | None = None
    tool_choice: Annotated[ToolChoice | None, Field(alias="toolChoice")] = None
    """
    Controls how the model uses tools.
    The client MUST return an error if this field is provided but ClientCapabilities.sampling.tools is not declared.
    Default is `{ mode: "auto" }`.
    """
    tools: list[Tool] | None = None
    """
    Tools that the model may use during generation.
    The client MUST return an error if this field is provided but ClientCapabilities.sampling.tools is not declared.
    """

meta class-attribute instance-attribute

meta: Annotated[Meta | None, Field(alias='_meta')] = None

See General fields: _meta for notes on _meta usage.

include_context class-attribute instance-attribute

include_context: Annotated[
    Literal["allServers", "none", "thisServer"] | None,
    Field(alias="includeContext"),
] = None

A request to include context from one or more MCP servers (including the caller), to be attached to the prompt. The client MAY ignore this request.

Default is "none". Values "thisServer" and "allServers" are soft-deprecated. Servers SHOULD only use these values if the client declares ClientCapabilities.sampling.context. These values may be removed in future spec releases.

max_tokens instance-attribute

max_tokens: Annotated[int, Field(alias='maxTokens')]

The requested maximum number of tokens to sample (to prevent runaway completions).

The client MAY choose to sample fewer tokens than the requested maximum.

metadata class-attribute instance-attribute

metadata: dict[str, Any] | None = None

Optional metadata to pass through to the LLM provider. The format of this metadata is provider-specific.

model_preferences class-attribute instance-attribute

model_preferences: Annotated[
    ModelPreferences | None, Field(alias="modelPreferences")
] = None

The server's preferences for which model to select. The client MAY ignore these preferences.

system_prompt class-attribute instance-attribute

system_prompt: Annotated[
    str | None, Field(alias="systemPrompt")
] = None

An optional system prompt the server wants to use for sampling. The client MAY modify or omit this prompt.

task class-attribute instance-attribute

task: TaskMetadata | None = None

If specified, the caller is requesting task-augmented execution for this request. The request will return a CreateTaskResult immediately, and the actual result can be retrieved later via tasks/result.

Task augmentation is subject to capability negotiation - receivers MUST declare support for task augmentation of specific request types in their capabilities.

tool_choice class-attribute instance-attribute

tool_choice: Annotated[
    ToolChoice | None, Field(alias="toolChoice")
] = None

Controls how the model uses tools. The client MUST return an error if this field is provided but ClientCapabilities.sampling.tools is not declared. Default is { mode: "auto" }.

tools class-attribute instance-attribute

tools: list[Tool] | None = None

Tools that the model may use during generation. The client MUST return an error if this field is provided but ClientCapabilities.sampling.tools is not declared.

CreateMessageRequest

Bases: WireModel

A request from the server to sample an LLM via the client. The client has full discretion over which model to select. The client should also inform the user before beginning sampling, to allow them to inspect the request (human in the loop) and decide whether to approve it.

Source code in src/mcp/types/v2025_11_25/__init__.py

class CreateMessageRequest(WireModel):
    """
    A request from the server to sample an LLM via the client. The client has full discretion over which model to select. The client should also inform the user before beginning sampling, to allow them to inspect the request (human in the loop) and decide whether to approve it.
    """

    model_config = ConfigDict(
        extra="ignore",
    )
    id: RequestId
    jsonrpc: Literal["2.0"]
    method: Literal["sampling/createMessage"]
    params: CreateMessageRequestParams