Claude Code v2.1.257 · 1 Sep 2026
Env var can force mid-conversation system prompt changes
A new env var forces mid-conversation system prompt changes that were previously decided by heuristics.
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All of v2.1.257
Use it now Tier: how much it should matter to you
5 Useful: my rating, 1 to 5
4 Signal: worth watching, 1 to 5
System Prompt Area: what it touches
New Features Kind: in v2.1.257, 01 Sep 26
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1 Sep 2026 · 505 entries, this one is #28.
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Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.
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Bash hooks fetch() gains session-scoped auth handles
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Hooks gain a 'script' hook type with an external-runner result protocol
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