hermes-source-patching

Read the traceback to identify the file, line, and function, then read the surrounding source and search for the same error pattern elsewhere. Patch the root cause in all matching locations and verify with syntax and import checks before restarting Hermes.

Run ast.parse on the modified file with the venv Python to catch syntax errors, then import the affected module to confirm dependencies resolve. Only run the full pytest suite if a venv with pytest actually exists.

The event loop closes before MCP server task coroutines finish cleanup, so t.cancel() in finally blocks raises RuntimeError on the closed loop. It is harmless stderr noise; fix it by moving t.cancel() inside the existing try/except block.

The file contains near-identical cleanup blocks in _wait_for_reconnect_or_shutdown and _run_keepalive, so the patch target is ambiguous. Add surrounding context lines to disambiguate or use replace_all=true to patch every occurrence.

Source patches take effect only on the next Hermes process start, not mid-session. After verifying the fix with syntax and import checks, restart Hermes to load the patched code.