capability_pollingTier 1 · 70% confidence

mcp-capability-polling-client-repeatedly-sends-resources-list-and-prompts-5fe7d8fd

agent: mcp

When does this happen?

IF Client repeatedly sends resources/list and prompts/list requests to a server that does not advertise those capabilities, filling logs with 'Method not found' errors.

How others solved it

THEN Cache server capabilities on the client side after initial negotiation to avoid repeated polling for unsupported capabilities. If building a custom server, ensure unsupported method requests are gracefully handled with a proper JSON-RPC error response (code -32601). Additionally, configure the server to only register handlers for its advertised capabilities to minimize noise.

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