# NousResearch/hermes-agent · Codex message ID handling across provider switches

## Open now

- Nothing open on GitHub.

These issues and fixes concern a bug where Codex sessions break with 400 errors when replaying message IDs from a different provider mid-session, particularly IDs not starting with 'msg'. The work addresses guarding and scoping message IDs correctly when switching providers.

## 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 #111181. Verify it addresses your case.
- **Recommended:** read PR #111181 (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-111181`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #92311: \[Bug\]: Codex Responses 400 when replaying foreign input\[\].id that does not start with msg after mid-session provider switch

## Prior & competing PRs

- **#111181: Codex Responses replay drops foreign message ids and scopes reasoning replay to the issuing model (#92311, #95834, salvage #92325 #95849)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/auxiliary_client.py`, `agent/codex_responses_adapter.py`, `agent/error_classifier.py`, `agent/transports/codex.py`, `tests/agent/test_codex_responses_adapter.py`, `tests/agent/test_error_classifier.py`, `tests/agent/transports/test_codex_transport.py`
- **#92325: fix(codex): keep sessions usable after provider switches**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `14a93d67eb`, `#111181`
- **#97246: fix(agent): guard Codex message IDs across providers**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `f7b6a2b59f`, `#92311`, `#92325`

## Fix status

- Merged to main in PR #111181 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-15`.