interopTier 1 · 70% confidence

mcp-interop-a-typescript-sdk-mcp-server-returns-method-not-fou-ca7ed4f5

agent: mcp

When does this happen?

IF A TypeScript SDK MCP server returns 'Method not found' for valid tools/list calls when the client (e.g., Python SDK) omits the optional params key from the JSON-RPC request, as the SDK incorrectly requires params to be present.

How others solved it

THEN Modify the server's request handler to treat a missing params as an empty object ({}), or upgrade to an SDK version that fixes this. In the handler, add: `const params = request.params || {};` before routing.

async function handleRequest(request) { const params = request.params || {}; /* dispatch */ }

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