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The API, CLI and MCP return idempotency_key_reused with HTTP 409. Repeating the same request unchanged does not help.

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What to do

This key was already used for a request with different arguments or from another login. To repeat that original request, send exactly its original arguments with this key from the same login; for a new request, use a new key. Never pair a new key with a request whose first attempt had an uncertain outcome: read its result first. If the steps above do not resolve it, report it with the request_id from the error.