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Sweep 01 Oct 2026 · 17:27Z Build v2.1.287 508 read Stable v2.1.285 Latest v2.1.287 Next v2.1.287 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.286 ·

New CLAUDE_CODE_CONFIG_PROBE variable skips two startup steps

When the CLAUDE_CODE_CONFIG_PROBE environment variable is set, Claude Code skips two of the routines it normally runs at startup

Use it now Notable No documentation found New Features
JSON All of v2.1.286
Use it nowTier: how much it should matter to you
5Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
StartupArea: what it touches
New FeaturesKind: in v2.1.286,
What probably matters to youSection of the release
What

Claude Code now checks a new environment variable, CLAUDE_CODE_CONFIG_PROBE. An environment variable is a named value set in your shell before a program starts. When it is set, two routines that normally run while Claude Code starts up stop early and do nothing.

Why

This looks like a probe mode: a way to start Claude Code just to inspect its configuration without the usual startup side effects. Nothing else in Claude Code reads the variable.

Read from
Names in the bundleCLAUDE_CODE_CONFIG_PROBE
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 what the two skipped startup routines do or who is expected to set this variable.
The name it cites is new in this buildNew in this build: CLAUDE_CODE_CONFIG_PROBE

See this entry in the whole of v2.1.286 →

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