NousResearch/hermes-agent

OpenAI response_format leaking into Anthropic Messages API

Cluster 85624 · agent. Data as of 2026-10-29 11:48 UTC

Nothing open on GitHub. Fix merged in #89589 on 19 Aug 2026. Check it covers your case.

open issues

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Known?: Yes. 3 related items grouped here, 1 issue already closed.
Fix event: A fix was merged to main in PR #89589. Check it covers your case. No release data is tracked.
Tracker: The maintainers' tracker marks this resolved, deciding PR #89589. That is separate from the fix event.
Still open: Nothing open on GitHub.

Next step: read #89589, then check it covers your case.

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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.

Open issues0

No open issues.

Open PRs0

No open pull requests.

Fixes on record

Merged to main. A stamp counts the issues a fix is linked to.

#89589 fix(aux): translate response_format for Anthropic wires and retry when providers reject structured output

merged to main

files: agent/auxiliary_client.py, tests/agent/test_anthropic_structured_output.py, tests/agent/test_structured_output_rejection_retry.py

1 PR closed without merging

From the close comments: done elsewhere 1

#85626 fix(aux): stop leaking OpenAI `response_format` onto the Anthropic Messages API · done elsewhere → 3c67501, 56eaf02, #89589, #85624

Closed issues · 1

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

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Link evidence (structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
Pairwise link density 0.67: the share of item 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.

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At a glance

Subsystem: agent
Merged PRs: #89589
Closed issues: 1
Attempts: 1 PR closed without merging
Fix link checked: 19 Aug 2026

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