Follow Discord

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.

← All of v2.1.59 Home All releases ←olderv2.1.58 v2.1.61newer→

Claude Code v2.1.59 25 Feb 2026

Plugin ZIP Cache System

What

A new ZIP-based caching system for MCP plugins, enabling efficient plugin distribution in headless and CI environments.

Details

Controlled by the CLAUDE_CODE_PLUGIN_CACHE_DIR environment variable
Creates versioned ZIP archives of plugin directories (with .zip extension)
Session-scoped plugin cache directories (claude-plugin-session-*) are automatically created and cleaned up
Marketplace JSON metadata is persisted alongside plugin ZIPs for offline resolution
Handles symlink cycles during ZIP creation with cycle detection
Includes CLAUDE_CODE_DISABLE_OFFICIAL_MARKETPLACE_AUTOINSTALL env var to disable automatic marketplace plugin installation

Evidence

ZIP cache mode (search for "zip cache mode"), session cache (search for "claude-plugin-session-")

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

See this entry in the whole of v2.1.59 →