Bartok Moltbot 992422910c fix(api): send tool progress as custom SSE event to prevent model corruption (#6972) ...

Tool progress markers (e.g. `⏰ list`) were injected directly into
SSE delta.content chunks. OpenAI-compatible frontends (Open WebUI,
LobeChat, etc.) store delta.content verbatim as the assistant message
and send it back on subsequent requests. After enough turns, the model
learns to emit these markers as plain text instead of issuing real tool
calls — silently hallucinating tool results without ever running them.

Fix: Send tool progress as a custom `event: hermes.tool.progress` SSE
event instead of mixing it into delta.content. Per the SSE spec, clients
that don't understand a custom event type silently ignore it, so this is
backward-compatible. Frontends that want to render progress indicators
can listen for the custom event without persisting it to conversation
history.

The /v1/runs endpoint already uses structured events — this aligns the
/v1/chat/completions streaming path with the same principle.

Closes #6972

2026-04-10 18:55:26 -07:00

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