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Add a client extension API (#3034)

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Max 2026-06-30 21:31:02 +01:00 • committed by GitHub
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6
examples/stories/apps/client.py
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@ -2,7 +2,7 @@
from mcp_types import TextContent, TextResourceContents
from mcp.client import Client
from mcp.client import Client, advertise
from mcp.server.apps import APP_MIME_TYPE, EXTENSION_ID
from stories._harness import Target, run_client
@ -10,7 +10,9 @@ from stories._harness import Target, run_client
async def main(target: Target, *, mode: str = "auto") -> None:
# Advertise MCP Apps support so the server returns the UI-enabled result; a
# client that omits this gets the text-only fallback (graceful degradation).
async with Client(target, mode=mode, extensions={EXTENSION_ID: {"mimeTypes": [APP_MIME_TYPE]}}) as client:
async with Client(
target, mode=mode, extensions=[advertise(EXTENSION_ID, {"mimeTypes": [APP_MIME_TYPE]})]
) as client:
# The extensions capability map rides `server/discover` (modern only). On a
# legacy connection (today's stdio) it is absent, so assert it only when present.
if client.server_capabilities.extensions is not None: