Plugin marketplace fails with EFAULT on macOS 26 Tahoe

Bug Description

The /plugin command fails to load the official marketplace with an EFAULT error on macOS 26 (Tahoe). This occurs every time — the marketplace never loads successfully.

Error Message

Failed to load all marketplaces. Errors: claude-plugins-official: Failed to load marketplace
"claude-plugins-official" from source (github): Failed to finalize marketplace cache. Please
manually delete the directory at /Users/<user>/.claude/plugins/marketplaces/claude-plugins-official
if it exists and try again.

Technical details: EFAULT: bad address in system call argument, rm
'/Users/<user>/.claude/plugins/marketplaces/claude-plugins-official'

Steps to Reproduce

1. Run /plugin in Claude Code
2. Marketplace fails to load with the above error
3. Manually deleting the cache directory (rm -rf) and retrying produces the same error — the directory is re-cloned but finalization fails again with EFAULT

Additional Notes

• The files in the cloned marketplace directory have protection flags (chflags) that prevent normal rm — chflags -R nouchg is needed before deletion works. This may be related to the EFAULT during the rm step in finalization.
• Manually cloning the repo (git clone https://github.com/anthropics/claude-plugins-official.git ~/.claude/plugins/marketplaces/claude-plugins-official) works, but /plugin still fails on the next invocation when it tries to finalize/update the cache.
• Possibly related to #52827 (marketplace finalization case-sensitivity bug), but this manifests as EFAULT on the rm call rather than ENOENT on rename.

Workaround

Manually clone the marketplace repo and copy skill files to ~/.claude/skills/ to bypass the marketplace loader entirely.

Environment

• Claude Code version: 2.1.119
• OS: macOS 26.4.1 (Tahoe) / Darwin 25.4.0
• Hardware: MacBook Pro, Apple M5 Max
• Filesystem: APFS (case-insensitive, default)