[BUG] Plugin cache not cleaning up old version folders on update

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Bug 1: /plugin update doesn't rebuild the cache

When running /plugin update, the plugin system fetches the latest code from GitHub into ~/.claude/plugins/marketplaces/<plugin>/ correctly, but doesn't rebuild the cache at ~/.claude/plugins/cache/<plugin>/ or update the gitCommitSha in installed_plugins.json. As a result, /reload-plugins sees no change and continues loading the stale cache.

Bug 2: Old version folders are not cleaned up after an update

When a plugin updates to a new version (e.g. 1.0.0 → 1.0.1), a new versioned folder is created in ~/.claude/plugins/cache/<plugin>/ but the old one is never deleted. Over time, every version bump accumulates a stale folder in cache, which will grow indefinitely.

What Should Happen?

Workaround for Bug 1: bumping the version in .claude-plugin/plugin.json forces a cache rebuild.

Expected behavior for Bug 2: when a new version folder is created, the previous version folder should be deleted automatically.

Error Messages/Logs

Steps to Reproduce

-

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.116

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_