NousResearch/hermes-agent

Empty tool_calls array causes HTTP 400 errors

Cluster 74101 · agent. Data as of 2026-10-29 11:48 UTC

Nothing open on GitHub. Fix merged in #86654 on 15 Aug 2026. Check it covers your case.

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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 #86654. Check it covers your case. No release data is tracked.
Tracker: The maintainers' tracker marks this unresolved. That is separate from the fix event.
Still open: Nothing open on GitHub.

Next step: read #86654, then check it covers your case.

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These items address a bug where sanitization or deduplication logic leaves behind an empty tool_calls array, triggering HTTP 400 errors from the API. Fixes target multiple points in the message sanitization pipeline where the empty key can be reintroduced.

Open issues0

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Fixes on record

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

#86654 fix(agent): close the empty tool_calls 400 class at all three chokepoints (#83312, #77921)

merged to main

files: agent/agent_runtime_helpers.py, agent/transports/chat_completions.py, tests/agent/transports/test_chat_completions_empty_tool_calls.py, tests/run_agent/test_message_sequence_repair.py

1 PR closed without merging

From the close comments: done elsewhere 1

#77377 fix(sanitize): drop tool_calls key when dedup removes all calls (fixes empty-array 400 class) · done elsewhere → #86654

Closed issues · 1

Closed#74101sanitize_api_messages dedup re-introduces tool_calls: [] after empty-array sanitizer (DeepSeek HTTP 400)

How this cluster was grouped

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(structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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: #86654
Closed issues: 1
Attempts: 1 PR closed without merging
Fix link checked: 15 Aug 2026

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