/debug

Enables debug logging for the current session and helps with troubleshooting via the session debug log.

Enables debug logging for the current session and helps with troubleshooting via the session debug log. [Skill] Debug logging is off by default (unless started with 'claude --debug'); running /debug mid-session captures logs only from that point on. Optionally, a problem description can be given to focus it.

✅ WHEN TO USE IT?

Start capturing debug logs from now on for a reproducible problem

/debug MCP server keeps disconnecting — right before triggering the problem again

Systematically enable logging before a hard-to-trace bug hunt

/debug to capture tool calls and errors in the session debug log

⛔ WHEN NOT TO?

The error already happened earlier

/debug only captures logs from the moment it's activated, earlier events are missing

Better: restart the session with 'claude --debug' to log from the very start

SOURCES

Claude Code Doku (offiziell) ↗ code.claude.com