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feat: add resource annotations support to FastMCP (#1468)

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Fenn Bailey 2025-10-14 21:07:37 +11:00 • committed by GitHub
commit cd7253c593
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1 changed files with 185 additions and 5 deletions
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6
src/mcp/server/fastmcp/resources/templates.py
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@ -12,7 +12,7 @@ from pydantic import BaseModel, Field, validate_call
from mcp.server.fastmcp.resources.types import FunctionResource, Resource
from mcp.server.fastmcp.utilities.context_injection import find_context_parameter, inject_context
from mcp.server.fastmcp.utilities.func_metadata import func_metadata
from mcp.types import Icon
from mcp.types import Annotations, Icon
if TYPE_CHECKING:
from mcp.server.fastmcp.server import Context
@ -29,6 +29,7 @@ class ResourceTemplate(BaseModel):
description: str | None = Field(description="Description of what the resource does")
mime_type: str = Field(default="text/plain", description="MIME type of the resource content")
icons: list[Icon] | None = Field(default=None, description="Optional list of icons for the resource template")
annotations: Annotations | None = Field(default=None, description="Optional annotations for the resource template")
fn: Callable[..., Any] = Field(exclude=True)
parameters: dict[str, Any] = Field(description="JSON schema for function parameters")
context_kwarg: str | None = Field(None, description="Name of the kwarg that should receive context")
@ -43,6 +44,7 @@ class ResourceTemplate(BaseModel):
description: str | None = None,
mime_type: str | None = None,
icons: list[Icon] | None = None,
annotations: Annotations | None = None,
context_kwarg: str | None = None,
) -> ResourceTemplate:
"""Create a template from a function."""
@ -71,6 +73,7 @@ class ResourceTemplate(BaseModel):
description=description or fn.__doc__ or "",
mime_type=mime_type or "text/plain",
icons=icons,
annotations=annotations,
fn=fn,
parameters=parameters,
context_kwarg=context_kwarg,
@ -108,6 +111,7 @@ class ResourceTemplate(BaseModel):
description=self.description,
mime_type=self.mime_type,
icons=self.icons,
annotations=self.annotations,
fn=lambda: result, # Capture result in closure
)
except Exception as e: