Issue 5622 reproduction, 2026-10-21, Linux x64.
Main SHA: ad4f18d83fe57b691b9858f62d2ed48459ea759d
Fix commit already on main: c2b127f8f11080dbdcfdb9cd0f8078fb10e7727b
Claude Code 2.1.303; mattpocock-skills 1.3.1.
Browser: T3 collaborative Chromium browser, 1280x800, dark theme.
Worktree: /home/ubuntu/wt/issue-5622; isolated state .t3; isolated Claude config /tmp/5622-claude.

Commands:
git -C ~/t3code fetch origin main
git -C ~/t3code worktree add ~/wt/issue-5622 origin/main
vp i
cd /tmp
CLAUDE_CONFIG_DIR=/tmp/5622-claude claude plugin install mattpocock-skills --marketplace mattpocock/skills --scope project --json
Result: Successfully installed plugin: mattpocock-skills@mattpocock (scope: project).
CLAUDE_CONFIG_DIR=/tmp/5622-claude claude plugin list --json
Result: version 1.3.1, scope project, enabled true, projectPath /tmp, projectEnabled true.
Existing machine provider endpoint/auth environment was copied privately into isolated Claude settings; no credentials are included here.
cd /home/ubuntu/wt/issue-5622
CLAUDE_CONFIG_DIR=/tmp/5622-claude vp run dev
Result: serverPort=15209 webPort=7169 baseDir=/home/ubuntu/wt/issue-5622/.t3.
App started with a read-only snapshot of real stopped-thread data (5.7 MB).
Paired browser through startup URL; added /tmp as local project; selected Claude Opus 5.5.
Typed $ then $mattpocock then $mattpocock-skills:tdd.
Result: plugin skills listed as Project Skill, including tdd, implement-spec, grill-with-docs and others. Selecting Tdd inserted a skill chip.
Added /tmp/.claude/skills/5622-filesystem-control/SKILL.md and typed $5622.
Result: 5622 Filesystem Control listed as Project Skill.

User-scope variant:
cd /tmp
CLAUDE_CONFIG_DIR=/tmp/5622-claude claude plugin install mattpocock-skills@mattpocock --scope user --json
Removed project enabledPlugins entry; uninstalled project-scoped plugin through Claude CLI.
CLAUDE_CONFIG_DIR=/tmp/5622-claude claude plugin uninstall mattpocock-skills@mattpocock --scope project
Result: only user installation remains, enabled true, projectEnabled false.
Restarted owned dev server and reloaded browser; typed $mattpocock-skills:tdd.
Result: Mattpocock Skills Tdd listed as Personal Skill.

Focused verification:
vp test run apps/server/src/provider/Drivers/ClaudeSkills.test.ts
Test Files 1 passed (1); Tests 20 passed (20).
No source changes, no PR, no forge writes.
Unverified: Electron/AppImage, mobile; older plugin 1.2.3; skills-dir plugin layout from later comment.