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All API errors
HTTP 400
invalid_request_body

Invalid MCP request body

The MCP HTTP request body could not be read or decoded.

Resolution

Send a valid MCP JSON-RPC request body.

Response handling

Keep the response's request_id for diagnostics. Retry only transient 429 and 503 responses, using the rate-limit headers and exponential backoff with jitter. Correct 400, 401, and 403 requests before retrying.

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