# NousResearch/hermes-agent · Codex reasoning-replay 'Unsupported content type' error recovery

## Open now

- Nothing open on GitHub.

These members all concern Codex rejecting replayed reasoning content with a 400 'Unsupported content type' error, which reportedly bypasses the existing invalid_encrypted_content self-heal path. One member describes the problem and the others propose changes to recover from it rather than abort the turn; the outcome of those changes is not established here.

## TL;DR

- 4 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 2 PR(s) closed without merging.
- A fix was merged to main in PR #115729. Verify it addresses your case.
- **Recommended:** read PR #115729 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-115729`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.50`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #51512: openai-codex: rejected reasoning-replay returns 400 {"detail":"Unsupported content type"} and bypasses the invalid_encrypted_content self-heal

## Prior & competing PRs

- **#115729: fix(codex): rejected reasoning replays phrased as thinking_signature_invalid or codex 'Unsupported content type' self-heal instead of aborting the turn (#70595, #51512, salvage #70597)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/codex_responses_adapter.py`, `agent/error_classifier.py`, `tests/agent/test_error_classifier.py`, `tests/agent/test_native_compaction.py`, `tests/agent/transports/test_codex_transport.py`
- **#51521: fix: recover Codex replay from unsupported content type**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `e62c5e3360a3`, `#115729`, `#70595`, `#51512`, `#70597`
- **#51525: fix(agent): recover codex unsupported content replay errors**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#51521`, `#51512`

## Fix status

- Merged to main in PR #115729 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-19`.
- Subsystem: `agent`