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Sweep 12 Nov 2026 · 23:00Z Build v2.1.323 540 read Stable v2.1.311 Latest v2.1.323 Next v2.1.323 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.323 ·

System prompt override text now names CLAUDE_CODE_SYSTEM_PROMPT_FEATURE_FLAG

The description of the system prompt override now names CLAUDE_CODE_SYSTEM_PROMPT_FEATURE_FLAG where it named CLAUDE_CODE_SYSTEM_PROMPT_GB_FEATURE

Use it now Notable No documentation found Improvements
JSON All of v2.1.323
Use it nowTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Environment VariablesArea: what it touches
ImprovementsKind: in v2.1.323,
What probably matters to youSection of the release

Unclear It is not clear whether Claude Code actually reads CLAUDE_CODE_SYSTEM_PROMPT_FEATURE_FLAG or only the description changed.

What

The system prompt is the standing set of instructions Claude Code gives the model. The built-in description of the setting that overrides it now names the environment variable CLAUDE_CODE_SYSTEM_PROMPT_FEATURE_FLAG as the one read on each turn. It used to name CLAUDE_CODE_SYSTEM_PROMPT_GB_FEATURE, which still appears elsewhere in Claude Code.

Why

If you set this override, the documented name of the variable is now different.

Read from
Names in the bundleCLAUDE_CODE_SYSTEM_PROMPT_FEATURE_FLAGCLAUDE_CODE_SYSTEM_PROMPT_GB_FEATURE
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not clear whether Claude Code actually reads `CLAUDE_CODE_SYSTEM_PROMPT_FEATURE_FLAG` or only the description changed.
The name it cites is new in this buildNew in this build: CLAUDE_CODE_SYSTEM_PROMPT_FEATURE_FLAG

See this entry in the whole of v2.1.323 →

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