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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.63 ·

Tool Result Summarization [Gradual Rollout]

Entry
JSON All of v2.1.63
EntryKind: in v2.1.63,
Bug FixesSection of the release
What

A feature that instructs the model to preserve important information from tool results in its response text, since original tool results may be cleared later (for context window management).

Status

Feature-flagged via tengu_summarize_tool_results (default false)

Details
  • When enabled, appends a system instruction: "When working with tool results, write down any important information you might need later in your response, as the original tool result may be cleared later."
  • Prepares for a future where tool results are more aggressively pruned from context
Evidence

Gated by tengu_summarize_tool_results flag (search for "tengu_summarize_tool_results")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.63 →

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