trigger: field in SKILL.md causes exponential slash command menu duplication across multiple running sessions

Bug Description

When a skill (~/.claude/skills/<name>/SKILL.md) has a trigger: /<name> field in its frontmatter, the slash command /name appears multiple times in the autocomplete menu — multiplied across running Claude Code sessions and/or CLAUDE.md files found walking up the directory tree.

Environment

• Claude Code version: 2.1.145.249
• Platform: macOS Darwin 24.6.0
• Installation: Homebrew cask

Steps to Reproduce

1. Create ~/.claude/skills/troubleshoot/SKILL.md with trigger: /troubleshoot in frontmatter
2. Create ~/.claude/commands/troubleshoot.md (a slash command wrapper for the same skill)
3. Start 5 Claude Code sessions from different working directories
4. In any session, type /troubleshoot to open the slash command menu

Observed

14 duplicate entries for /troubleshoot in the slash menu:

• 13 entries with the SKILL.md description, no tag
• 1 entry with the commands file description, tagged (user)

Expected

/troubleshoot appears once (from the commands file) or at most twice if both mechanisms are active.

Notes

• The 13 untagged entries correlate with the number of running sessions (5) and CLAUDE.md files found walking up the cwd hierarchy (27 in this case)
• Removing the trigger: field from SKILL.md eliminates the duplicates
• Skills without trigger: do not appear in the slash menu at all (correct)
• The trigger: field appears to have no documented effect other than causing this duplication