wehub-resource-sync
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65 lines
1.9 KiB
Python
65 lines
1.9 KiB
Python
"""Package a vendor verb and a tool as a reusable, advertised extension (SEP-2133).
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`custom_methods/` registers a verb on the lowlevel `Server` by hand; this story
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bundles the same idea as an `Extension`: declared contributions, a settings entry
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under `ServerCapabilities.extensions`, and a `require_client_extension` gate on
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the vendor method.
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"""
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from collections.abc import Sequence
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from typing import Any
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import mcp_types as types
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from pydantic import Field
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from mcp.server.context import ServerRequestContext
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from mcp.server.extension import Extension, MethodBinding, ToolBinding
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from mcp.server.mcpserver import MCPServer, require_client_extension
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from stories._hosting import run_server_from_args
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EXTENSION_ID = "com.example/catalog"
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class SearchParams(types.RequestParams):
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"""Subclass `RequestParams` so `_meta` (and the 2026 envelope keys) parse uniformly."""
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query: str
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limit: int = Field(default=3, ge=1, le=25)
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class SearchResult(types.Result):
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items: list[str]
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def suggest(prefix: str) -> str:
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"""Suggest a catalog entry for a prefix."""
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return f"{prefix}-suggestion"
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async def search(ctx: ServerRequestContext[Any, Any], params: SearchParams) -> SearchResult:
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require_client_extension(ctx, EXTENSION_ID)
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return SearchResult(items=[f"{params.query}-{n}" for n in range(params.limit)])
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class Catalog(Extension):
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"""One identifier, three contributions: settings, a tool, a vendor method."""
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identifier = EXTENSION_ID
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def settings(self) -> dict[str, Any]:
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return {"suggest": True}
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def tools(self) -> Sequence[ToolBinding]:
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return [ToolBinding(fn=suggest)]
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def methods(self) -> Sequence[MethodBinding]:
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return [MethodBinding("com.example/search", SearchParams, search)]
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def build_server() -> MCPServer:
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return MCPServer("extensions-example", extensions=[Catalog()])
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if __name__ == "__main__":
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run_server_from_args(build_server)
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