# NousResearch/hermes-agent · OpenAI response_format leaking into Anthropic Messages API

## Open now

- Nothing open on GitHub.

A bug where OpenAI-specific response_format parameters were being sent to the Anthropic Messages API, causing errors. Related fixes address preventing the leak and translating or retrying structured output for Anthropic providers.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #89589. Verify it addresses your case.
- **Recommended:** read PR #89589 (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-89589`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.67`: 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

- #85624: Auto-title fails 100% on Bedrock/Anthropic: OpenAI-only \`response_format\` leaked onto the Messages API (\`Extra inputs are not permitted\`)

## Prior & competing PRs

- **#89589: fix(aux): translate response_format for Anthropic wires and retry when providers reject structured output**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/auxiliary_client.py`, `tests/agent/test_anthropic_structured_output.py`, `tests/agent/test_structured_output_rejection_retry.py`
- **#85626: fix(aux): stop leaking OpenAI \`response_format\` onto the Anthropic Messages API**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `3c675019f`, `56eaf0247`, `#89589`, `#85624`

## Fix status

- Merged to main in PR #89589 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-08-19`.
- Subsystem: `agent`