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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.98 9 Apr 2026

Perforce Workspace Support

What

First-class support for Perforce version control workspaces, including read-only file detection and checkout guidance.

Usage

export CLAUDE_CODE_PERFORCE_MODE=1

Details

When enabled, Claude Code detects files that haven't been opened for edit in Perforce
Write tool returns a specific error message guiding users to run p4 edit <file> before modifying
Prevents chmod workarounds that would bypass Perforce tracking
System prompt includes Perforce-specific guidance for the model

Evidence

Perforce mode (search for "CLAUDE_CODE_PERFORCE_MODE" and "File is read-only — it has not been opened for edit in Perforce")

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

See this entry in the whole of v2.1.98 →