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

Claude Code v2.1.86 ·

Agent System Prompt Refinements

Entry
JSON All of v2.1.86
EntryKind: in v2.1.86,
ChangesSection of the release

Agent system prompts have been refined with more specific guidance:

  • New "don't gold-plate" phrasing: "Complete the task fully—don't gold-plate, but don't cut corners"
  • More emphatic $TMPDIR guidance: "TMPDIR is automatically set to the correct sandbox-writable directory" (removed fallback variable mention)
  • New guidance on failure handling: "diagnose why before switching tactics—read the error, check your assumptions, try a focused fix"
  • Fork workers now use a "Your directive:" prefix with a "fork-boilerplate" key instead of embedded boilerplate text
  • Summary format now strictly requires <analysis> and <summary> blocks with tool-call prohibition: "CRITICAL: Respond with TEXT ONLY. Do NOT call any tools"
Evidence

Agent prompt changes (search for "Your directive:" and "CRITICAL: Respond with TEXT ONLY")

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

See this entry in the whole of v2.1.86 →

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