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29 changes: 29 additions & 0 deletions automations/livekit-agent/2026-08-08.markdown
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# LiveKit Agents 工程日报

**Date range covered:** 2026-08-07 00:01 UTC → 2026-08-08 00:01 UTC

**仓库：** [livekit/agents](https://github.com/livekit/agents)（upstream/main）

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## 关键变更

- **PyPI 发布 livekit-agents@1.6.9** — [#6753](https://github.com/livekit/agents/pull/6753) 将全量包版本升至 **1.6.9**（自 1.6.8 起累计 **36** 个 commit）。发布窗口内合入的修复/特性包括：TTS fallback 流式恢复 ([#6684](https://github.com/livekit/agents/pull/6684))、Deepgram `end_time` 末词修正 ([#6712](https://github.com/livekit/agents/pull/6712))、`session_host` ([#6725](https://github.com/livekit/agents/pull/6725))、Baseten Qwen3 STT/TTS ([#6700](https://github.com/livekit/agents/pull/6700))、OpenAI STT context hints + `openai>=2.50` ([#6705](https://github.com/livekit/agents/pull/6705))、Fish quality-guard ([#6734](https://github.com/livekit/agents/pull/6734))、Nova Sonic 音频门控 ([#6720](https://github.com/livekit/agents/pull/6720))、IPC PSS 内存报告 ([#6082](https://github.com/livekit/agents/pull/6082)) 与 `is_alive` 修复 ([#6732](https://github.com/livekit/agents/pull/6732)) 等。影响：生产升级需关注 voice/TTS/realtime 行为变化。

- **Expressive 模式正式对外 + 示例** — [#6698](https://github.com/livekit/agents/pull/6698) 在公共 API 暴露 expressive 模式，新增 `_mood.py` / `_mood_data.py`（+445 行）与 `examples/expressive_agent/` 完整示例；`drive-thru` 目录重命名为 `drive_thru` 并更新 CI/deploy 配置。影响：开发者可直接启用情绪/表现力 TTS 控制；示例路径变更需同步部署脚本。

- **xAI Realtime 每轮仅一条最终转写** — [#6729](https://github.com/livekit/agents/pull/6729) 修复 xAI 在每次 audio commit 重复发送 `input_audio_transcription.completed` 导致同一轮出现多条 `user_input_transcribed`、历史重复与客户端分段的问题；同时修复 OpenAI realtime 插件中 dropped response 流未关闭、rejected item 阻塞 `update_chat_ctx` 等路径（+336 行 xAI 测试、+125 行 OpenAI 测试），并新增 `grok-voice-think-fast-2.0` 模型。影响：xAI/OpenAI realtime 会话转写与打断可靠性显著提升。

- **工具重复调用策略细化** — [#6610](https://github.com/livekit/agents/pull/6610) 为 `@function_tool` 新增 `duplicate_scope`（`"name"` / `"name_and_args"`），允许按工具名或「工具名+参数」判定重复；`tool_executor.py` 实现规范化参数比较，`tests/test_tools.py` 新增 **+262** 行覆盖。影响：并发/重复工具调用场景可更精细地 reject/replace/confirm，但文档明确「fail open」——不可作为 exactly-once 保证。

- **Inference 429 配额可观测性** — [#6736](https://github.com/livekit/agents/pull/6736) 在 `inference.LLM` 收到 429 时解析 gateway 的 `X-LiveKit-Inference-*` 头（RPM/TPM/Credits limit & used），输出结构化 warning 后再抛出 `APIStatusError`；`tests/test_inference_utils.py` 新增 11 项单测。影响：限流排障可直接看到触发的配额维度，旧 gateway 仅记录 model + request_id。

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## Watchlist

1. **Voice 生命周期修复栈仍未合入** — [#6733](https://github.com/livekit/agents/pull/6733)（用户说话时禁止启动回复 playout）、[#6714](https://github.com/livekit/agents/pull/6714)（待转写时延迟 false-interruption resume）、[#6745](https://github.com/livekit/agents/pull/6745)（playout 启动时挂起 pending replies）均 OPEN；与已合入的 [#6729](https://github.com/livekit/agents/pull/6729) xAI 修复存在重叠关注面，realtime 打断/转写回归风险仍在。

2. **Expressive 后续与 xAI 默认值对齐** — [#6747](https://github.com/livekit/agents/pull/6747)（自定义 expressiveness steering）在 [#6698](https://github.com/livekit/agents/pull/6698) 合入后同日更新；[#6755](https://github.com/livekit/agents/pull/6755)（xAI realtime Voice Agent 默认值与 API 覆盖对齐）为 [#6729](https://github.com/livekit/agents/pull/6729) 的跟进，升级 1.6.9 后建议关注 xAI 集成是否需同步配置。

3. **Fork 落后 upstream 408 commits** — `origin/main` 未同步 1.6.9 及本周 voice/inference/expressive 变更；另 [#6739](https://github.com/livekit/agents/issues/6739) 报告 Cartesia WebSocket 握手失败时 API Key 泄漏至日志，对应修复 [#6740](https://github.com/livekit/agents/pull/6740) 仍 OPEN，生产日志需留意敏感信息。