Symptom
With the Streamable HTTP client, call_tool waits until timeout even though the server already finished, when the response can't be parsed.
Evidence what you'll see
- A truncated or invalid SSE payload fails JSONRPCMessage validation
- No error reaches the caller
- Server has already finished the tool call
Cause
On parse errors or an unexpected content type, the client sent a bare exception into the stream, which never resolved the pending request.
Fix steps
0 of 2 done
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Verify the fix worked
- Point the client at a server that returns invalid JSON or text/plain and confirm call_tool raises an error immediately instead of waiting for the timeout.
Sources and credit
Summarized in our own words from these public reports. Credit goes to their authors.
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