Follow Discord
Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.257 ·

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.

TierUse it nowhow much it should matter to you
Useful5my rating, 1 to 5
Signal4worth watching, 1 to 5
AreaSystem Promptwhat it touches
KindNew Featuresin v2.1.257,
Use it now Notable No documentation found

A new env var forces mid-conversation system prompt changes that were previously decided by heuristics.

A new environment variable, CLAUDE_CODE_FORCE_MID_CONVERSATION_SYSTEM, forces the mid-conversation system-prompt-change path that was previously gated only by model and session heuristics.

Read from
Names in the bundleCLAUDE_CODE_FORCE_MID_CONVERSATION_SYSTEM

See this entry in the whole of v2.1.257 →

Feedback