Feature request: Indicate when a skill is being used

Summary

When Claude responds using a skill from .claude/skills/, there's no indication to the user that a skill is being applied. It would be helpful to see which skill (if any) is guiding the response.

Current Behavior

• Skills are loaded silently from .claude/skills/
• Responses that use skills look identical to responses inferred from context
• No way to verify if a skill was actually used
• /skills command doesn't exist to list loaded skills

Desired Behavior

Some indication when a skill is active, e.g.:

> Reggie, how's my backlog?

⏺ Using skill: reggie-backlog-health

⏺ Bash(python reggie.py health --all)
...

Or a /skills command to list loaded skills and their trigger patterns.

Why This Matters

• Debugging: Hard to tell if a skill isn't working or just not triggering
• Trust: Users can't verify their skill customizations are being applied
• Development: When building skills, feedback on activation helps iteration

Environment

• Claude Code v2.0.69
• macOS