NousResearch/hermes-agent

Fix empty stream error for reasoning model deltas

Cluster 56516 · agent. Data as of 2026-10-28 11:56 UTC

Nothing open on GitHub. Fix merged in #115800 on 19 Sep 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 #115800. Check it covers your case. No release data is tracked.
Tracker: The maintainers' tracker marks this resolved, deciding PR #115800. That is separate from the fix event.
Still open: Nothing open on GitHub.

Next step: read #115800, then check it covers your case.

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These issues and PRs address a bug where streaming reasoning models incorrectly trigger an 'empty stream' error because reasoning content arrives in delta.model_extra rather than standard fields. The fixes update handling to recognize reasoning deltas as valid stream content.

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.

#115800 fix(agent): reasoning-only streams carrying reasoning in delta.model_extra no longer fail as an empty stream (#56516, salvage #56789)

merged to main

files: agent/auxiliary_client.py, agent/chat_completion_helpers.py, contributors/emails/[redacted:email], tests/agent/test_aux_progress_streaming.py, tests/agent/test_run_agent.py

1 PR closed without merging

From the close comments: merged via another change 1

#56789 fix(provider): handle reasoning deltas in model_extra · merged via another change → eed6fa2, #115800, #56516, #56789

Closed issues · 1

Closed#56516[Bug]: Streaming reasoning models may incorrectly trigger "Provider returned an empty stream"

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At a glance

Subsystem: agent
Merged PRs: #115800
Closed issues: 1
Attempts: 1 PR closed without merging
Fix link checked: 19 Sep 2026

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