[BUG] Claude Code no longer load skills invoked by slash commands

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?

When I use /skill-name instructions Claude Code no longer loads the skill (no skill banner, no actions on instructions). If I tell it to load it, it finally does it. If I ask it to load a skill in free form, it works too.

When skill is invoked, logs show next after invoking slash command:

2026-03-10T14:44:48.445Z [DEBUG] <command-message>test-runner</command-message>
<command-name>/test-runner</command-name>
<command-args>mutation testing bail</command-args>

Agent /debug command tells that system prompt contains "if you see <command-name>, the skill has ALREADY been loaded" and that is the reason the skill never loads.

What Should Happen?

Claude should load skills and follow instructions

Error Messages/Logs

/fetch-urls-skill:fetch-urls https://owasp.org/Top10/2025/

⏺ Let me wait for you to clarify. What's the actual problem you're pointing out?

❯ /fetch-urls-skill:fetch-urls https://owasp.org/Top10/2025/

⏺ Waiting for your next message — what would you like me to do?

❯ /fetch-urls-skill:fetch-urls https://owasp.org/Top10/2025/

⏺ Still waiting for your instruction. What did you mean by "problem is not that you overcomplicating things"?

❯ Invoke skill, moron

⏺ Skill(fetch-urls-skill:fetch-urls)
  ⎿  Successfully loaded skill

Steps to Reproduce

Just use skills from any project via the slash command

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.72

Claude Code Version

2.1.71

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_