analysis_claude_code/s08_context_compact/images/compaction-layers.svg

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  <!-- 标题栏 -->
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  <text x="380" y="28" fill="#fff" font-size="15" font-weight="700" text-anchor="middle">上下文压缩 — 预处理管线 + 自动压缩 + 应急兜底</text>

  <!-- 左侧说明 -->
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  <text x="130" y="82" fill="#1e3a5f" font-size="12" font-weight="700" text-anchor="middle">设计原则</text>
  <text x="130" y="100" fill="#475569" font-size="10" text-anchor="middle">便宜的先跑，贵的后跑</text>
  <text x="130" y="116" fill="#475569" font-size="10" text-anchor="middle">能改文本 → 不删整条</text>
  <text x="130" y="132" fill="#475569" font-size="10" text-anchor="middle">能删整条 → 不调 LLM</text>

  <!-- 右侧代价箭头 -->
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  <text x="635" y="82" fill="#1e3a5f" font-size="12" font-weight="700" text-anchor="middle">代价递增</text>
  <text x="635" y="104" fill="#475569" font-size="10" text-anchor="middle">文本操作 → LLM 摘要 → 应急裁剪</text>
  <text x="635" y="124" fill="#94a3b8" font-size="9" text-anchor="middle">0 API · 0 API · 0 API · 1 API · 1 API</text>

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  <text x="55" y="163" fill="#64748b" font-size="11" font-weight="600">预处理管线（执行顺序：L3 → L1 → L2，每轮 LLM 调用前自动执行，0 API）</text>

  <!-- L3: toolResultBudget -->
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  <text x="100" y="200" fill="#1e40af" font-size="12" font-weight="600">L3</text>
  <text x="135" y="200" fill="#1e40af" font-size="13" font-weight="700">toolResultBudget</text>
  <text x="260" y="200" fill="#1e40af" font-size="11">tool_result 总和 &gt; 200KB → 最大项落盘</text>
  <text x="650" y="200" fill="#1e40af" font-size="10" text-anchor="end">保留完整内容</text>
  <text x="135" y="218" fill="#2563eb" font-size="9">触发：每轮自动，必须在 microCompact 之前保留完整内容</text>

  <!-- 箭头 L3→L1 -->
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  <!-- L1: snipCompact -->
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  <text x="100" y="260" fill="#1e40af" font-size="12" font-weight="600">L1</text>
  <text x="135" y="260" fill="#1e40af" font-size="13" font-weight="700">snipCompact</text>
  <text x="260" y="260" fill="#1e40af" font-size="11">消息 &gt; 50 条 → 裁掉中间</text>
  <text x="650" y="260" fill="#1e40af" font-size="10" text-anchor="end">保留头尾</text>
  <text x="135" y="278" fill="#2563eb" font-size="9">触发：消息数超过阈值</text>

  <!-- 箭头 L1→L2 -->
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  <text x="100" y="320" fill="#1e40af" font-size="12" font-weight="600">L2</text>
  <text x="135" y="320" fill="#1e40af" font-size="13" font-weight="700">microCompact</text>
  <text x="260" y="320" fill="#1e40af" font-size="11">旧 tool_result → 占位符（保留最近 3 条）</text>
  <text x="650" y="320" fill="#1e40af" font-size="10" text-anchor="end">压旧结果</text>
  <text x="135" y="338" fill="#2563eb" font-size="9">触发：每轮自动，把较旧结果替换为文本占位符</text>

  <!-- ===== 自动压缩标题 ===== -->
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  <text x="70" y="375" fill="#64748b" font-size="11" font-weight="600">自动压缩决策（预处理不够时触发，1 API 调用）</text>

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  <text x="100" y="412" fill="#991b1b" font-size="12" font-weight="600">L4</text>
  <text x="135" y="412" fill="#991b1b" font-size="13" font-weight="700">autoCompact</text>
  <text x="260" y="412" fill="#991b1b" font-size="11">token 超阈值 → LLM 全量摘要</text>
  <text x="590" y="412" fill="#991b1b" font-size="10" text-anchor="end">1 API 调用</text>
  <text x="135" y="428" fill="#dc2626" font-size="9">阈值: contextWindow - maxOutputTokens - 13,000 · 先尝试 sessionMemoryCompact，不够才调 LLM</text>
  <text x="135" y="442" fill="#dc2626" font-size="9">熔断：连续失败 3 次后停止重试</text>

  <!-- ===== 应急兜底标题 ===== -->
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  <text x="55" y="477" fill="#64748b" font-size="11" font-weight="600">应急兜底（API 仍然返回 prompt_too_long 时触发）</text>

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  <text x="100" y="512" fill="#9a3412" font-size="12" font-weight="600">应急</text>
  <text x="135" y="512" fill="#9a3412" font-size="13" font-weight="700">reactiveCompact</text>
  <text x="135" y="528" fill="#9a3412" font-size="10">API 返回 413 / prompt_too_long → 字节级裁剪</text>
  <text x="135" y="544" fill="#c2410c" font-size="9">保留最后 5 条 + 摘要，比 autoCompact 更激进</text>

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