Claude Cookbook：上下文工程三招——記憶、壓縮（compaction）、清除工具結果
Context engineering: memory, compaction, and tool clearing
摘要分析
Anthropic 2026-03-20 的 cookbook 比較三種官方上下文管理機制：Compaction（compact_20260112）在輸入達 150K 時把對話摘要、之後只帶摘要；Tool-result clearing（clear_tool_uses_20250919）把舊工具結果換成占位符，零推論成本；Memory tool（memory_20250818）讓模型在 /memories 讀寫檔案跨 session 保留。實測清除工具結果讓峰值上下文從 335K 降到 173K。建議依瓶頸選：工具輸出肥用 clearing、長對話用 compaction、跨 session 用 memory。
- Compaction：betas=["compact-2026-01-12"]，context_management edits type=compact_20260112，trigger input_tokens 150_000
- Clearing：type=clear_tool_uses_20250919，設 trigger／keep／clear_at_least，exclude_tools 保護 memory
- Memory：tools 加 {"type":"memory_20250818","name":"memory"}，自己實作 view/create/str_replace/insert/delete/rename
- 回傳的 compaction block 要序列化回歷史，API 會丟掉它之前的內容
- 選擇原則：工具輸出肥→clearing；對話長→compaction；要跨 session→memory
Published 2026-03-20, this Claude Cookbook compares three first-party context-management primitives. Compaction (compact_20260112 with beta header compact-2026-01-12) summarizes the whole transcript when input reaches a trigger (default 150K, minimum 50K) and continues from the summary; it is lossy, so custom instructions should name details that must survive. Tool-result clearing (clear_tool_uses_20250919) replaces old tool_result content with placeholders while keeping tool_use records, at zero inference cost; parameters include trigger, keep and clear_at_least. The memory tool (memory_20250818) lets the model read and write files under /memories that persist across sessions, with your app implementing the handler and guarding path traversal. Measured results: clearing cut peak context from about 335K to 173K tokens, and a memory-enabled second session needed 4 file reads instead of 8. Choose by bottleneck: clearing for bulky tool output, compaction for long dialogue, memory for cross-session knowledge.
- Compaction: beta compact-2026-01-12, edit type compact_20260112, trigger 150K
- Clearing: clear_tool_uses_20250919 with trigger/keep/clear_at_least
- Memory: tool type memory_20250818 with six commands you implement
- Serialize the compaction block back into history
- Pick by bottleneck: clearing, compaction, or memory
關鍵字：context engineeringcompactionmemory tooltool clearingClaude API
來源原文：https://platform.claude.com/cookbook/tool-use-context-engineering-context-engineering-tools
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