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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 v2.1.15 21 Jan 2026

Cowork Plugins Directory Support [Hidden]

What

A new hidden --cowork flag enables an alternate plugin directory for development and testing workflows.

Usage

# Via CLI flag
claude plugins list --cowork
claude plugins install my-plugin --cowork

# Via environment variable
CLAUDE_CODE_USE_COWORK_PLUGINS=true claude

Details

When enabled, plugins are stored in cowork_plugins/ instead of plugins/
Settings file changes to cowork_settings.json instead of settings.json
The --cowork flag is hidden from help output (.hideHelp())
Only available with user scope for certain commands; attempting to use with other scopes results in an error
Can be enabled via CLAUDE_CODE_USE_COWORK_PLUGINS environment variable

Evidence

Cn5() at line 90980 (plugin directory selector, contains "cowork_plugins"), CLI definitions at line 560985 (contains "--cowork", "Use cowork_plugins directory")

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

See this entry in the whole of v2.1.15 →