feat(agent): item 12 子代理自动后台化阈值 FUSION_SUBAGENT_AUTO_BACKGROUND_MS (CC 2.1.198/232) - #103
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…C 2.1.198/232) 扩 getAutoBackgroundMs 加 fusion env 分支 FUSION_SUBAGENT_AUTO_BACKGROUND_MS (并行 item 4 FUSION_MCP_AUTO_BACKGROUND_MS)。设正值 → subagent 运行该毫秒后 转后台, 复用现成 registerAgentForeground 定时器→backgroundSignal→mid-run 后台化解阻塞 turn。default 0=off, byte-identical 旧行为。无需 QueryEngine 解耦。 Closes #102 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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背景
Closes #102。enhance-0819.md item 12 (CC 2.1.198/232): 子代理默认后台化。
缺口
现 subagent 走 sync foreground 阻塞 turn (toolExecution.ts:1392 await)。
getAutoBackgroundMs()(AgentTool.tsx:161) 仅读CLAUDE_AUTO_BACKGROUND_TASKS/GrowthBooktengu_auto_background_agents, default 0=off。OSS 构建 GrowthBook 不生效 → subagent 永不自动后台。item 4 (PR #94) 已为 MCP 落FUSION_MCP_AUTO_BACKGROUND_MS, 但 subagent 走独立路径 (AgentTool/LocalAgentTask), 不共享代码。方案 (surgical)
src/tools/AgentTool/autoBackground.ts:getSubagentAutoBackgroundMs()解析FUSION_SUBAGENT_AUTO_BACKGROUND_MSenv (parseInt, default 0=off, 负数/非数 fail-off)。getAutoBackgroundMs()加 fusion env 分支 (在 CLAUDE_AUTO_BACKGROUND_TASKS/GrowthBook 前), 正值即返回。registerAgentForeground定时器 (LocalAgentTask.tsx:590-616) →backgroundSignal→ mid-run 后台化 (AgentTool.tsx:1263) 解阻塞 turn。验证
subagentAutoBackground.test.ts7 pass (env 解析全 edge case)src/__tests__/187 pass, 0 fail跨工程规则
仅改 fusion-code。Commit trailer: Co-Authored-By: Claude Fable 5 noreply@anthropic.com