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Add meta=tool.meta passthrough to FastMCP for ext-apps #19

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Merged
skaar merged 1 commit into from
Dec 2, 2025
Merged

Add meta=tool.meta passthrough to FastMCP for ext-apps #19

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7 changes: 7 additions & 0 deletions reboot/mcp/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -314,6 +314,7 @@ class Tool:
description: str | None
annotations: mcp.types.ToolAnnotations | None
structured_output: bool | None
meta: dict[str, Any] | None = None


LogLevel: TypeAlias = Literal["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
Expand Down Expand Up @@ -539,6 +540,7 @@ def tool(
description: str | None = None,
annotations: mcp.types.ToolAnnotations | None = None,
structured_output: bool | None = None,
meta: dict[str, Any] | None = None,
) -> Callable[[mcp.types.AnyFunction], mcp.types.AnyFunction]:
"""Decorator to register a tool.

Expand All @@ -555,6 +557,7 @@ def tool(
- If None, auto-detects based on the function's return type annotation
- If True, unconditionally creates a structured tool (return type annotation permitting)
- If False, unconditionally creates an unstructured tool
meta: Optional metadata dict exposed as _meta in the MCP protocol.

Example:
@server.tool()
Expand Down Expand Up @@ -585,6 +588,7 @@ def decorator(fn: mcp.types.AnyFunction) -> mcp.types.AnyFunction:
description=description,
annotations=annotations,
structured_output=structured_output,
meta=meta,
)
return fn

Expand All @@ -598,6 +602,7 @@ def add_tool(
description: str | None = None,
annotations: mcp.types.ToolAnnotations | None = None,
structured_output: bool | None = None,
meta: dict[str, Any] | None = None,
) -> None:
self._tools.append(
Tool(
Expand All @@ -607,6 +612,7 @@ def add_tool(
description=description,
annotations=annotations,
structured_output=structured_output,
meta=meta,
)
)

Expand Down Expand Up @@ -711,6 +717,7 @@ def _streamable_http_app(
description=tool.description,
annotations=tool.annotations,
structured_output=tool.structured_output,
meta=tool.meta,
)

_servers[path] = mcp._mcp_server
Expand Down