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feat(api-server): stream /v1/responses SSE tool events

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simon-marcus 2026-04-14 09:48:49 -04:00 • committed by Teknium
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website/docs/user-guide/features/api-server.md
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@ -83,9 +83,11 @@ Standard OpenAI Chat Completions format. Stateless — the full conversation is
}
```
**Streaming** (`"stream": true`): Returns Server-Sent Events (SSE) with token-by-token response chunks. When streaming is enabled in config, tokens are emitted live as the LLM generates them. When disabled, the full response is sent as a single SSE chunk.
**Streaming** (`"stream": true`): Returns Server-Sent Events (SSE) with token-by-token response chunks. For **Chat Completions**, the stream uses standard `chat.completion.chunk` events plus Hermes' custom `hermes.tool.progress` event for tool-start UX. For **Responses**, the stream uses OpenAI Responses event types such as `response.created`, `response.output_text.delta`, `response.output_item.added`, `response.output_item.done`, and `response.completed`.
**Tool progress in streams**: When the agent calls tools during a streaming request, brief progress indicators are injected into the content stream as the tools start executing (e.g. `` `💻 pwd` ``, `` `🔍 Python docs` ``). These appear as inline markdown before the agent's response text, giving frontends like Open WebUI real-time visibility into tool execution.
**Tool progress in streams**:
- **Chat Completions**: Hermes emits `event: hermes.tool.progress` for tool-start visibility without polluting persisted assistant text.
- **Responses**: Hermes emits spec-native `function_call` and `function_call_output` output items during the SSE stream, so clients can render structured tool UI in real time.
### POST /v1/responses