wehub-resource-sync
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38 lines
1.7 KiB
Python
38 lines
1.7 KiB
Python
"""Negotiate MCP Apps, discover a tool's `ui://` UI, fetch it, and call the tool."""
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from mcp_types import TextContent, TextResourceContents
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from mcp.client import Client, advertise
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from mcp.server.apps import APP_MIME_TYPE, EXTENSION_ID
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from stories._harness import Target, run_client
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async def main(target: Target, *, mode: str = "auto") -> None:
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# Advertise MCP Apps support so the server returns the UI-enabled result; a
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# client that omits this gets the text-only fallback (graceful degradation).
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async with Client(
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target, mode=mode, extensions=[advertise(EXTENSION_ID, {"mimeTypes": [APP_MIME_TYPE]})]
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) as client:
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# The extensions capability map rides `server/discover` (modern only). On a
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# legacy connection (today's stdio) it is absent, so assert it only when present.
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if client.server_capabilities.extensions is not None:
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assert client.server_capabilities.extensions == {EXTENSION_ID: {}}, client.server_capabilities.extensions
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listed = await client.list_tools()
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tool = next(t for t in listed.tools if t.name == "get_time")
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assert tool.meta is not None, tool
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assert tool.meta["ui"]["resourceUri"] == "ui://get-time/app.html", tool.meta
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ui = await client.read_resource("ui://get-time/app.html")
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contents = ui.contents[0]
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assert isinstance(contents, TextResourceContents)
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assert contents.mime_type == APP_MIME_TYPE, contents.mime_type
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result = await client.call_tool("get_time", {})
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assert isinstance(result.content[0], TextContent)
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assert result.content[0].text == "2026-06-26T00:00:00Z", result.content[0].text
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if __name__ == "__main__":
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run_client(main)
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