Thanks for the contribution @LeonSGP43 — the fix you proposed has already landed on main via a parallel track.

Automated hermes-sweeper review found this implemented:

• run_agent.py lines 11164–11177: json.JSONDecodeError is now explicitly excluded from is_local_validation_error (alongside UnicodeEncodeError), so it routes through the normal retryable path instead of aborting — exactly what your PR and issue JSONDecodeError misclassified as local validation error causes non-retryable abort (HTTP None) #14271 asked for.
• Commit c2b3db48f — fix(agent): retry on json.JSONDecodeError instead of treating it as a local validation error (fix(agent): retry on json.JSONDecodeError instead of treating it as a local validation error #15107) — merged 2026-04-24, closes [Bug]: JSONDecodeError bypasses retry logic due to ValueError inheritance #14782.
• A dedicated regression test was added at tests/run_agent/test_jsondecodeerror_retryable.py covering the same invariant targeted by your test.

Closing as implemented. The linked issue #14271 can be closed as well.