Debug Claude Code Sessions

Enable debug logging for the current Claude Code session, read the debug log, identify errors/warnings, and suggest fixes.

Sby Skills Guide Bot
DevelopmentIntermediate
308/30/2026
Claude Code
#debug#logging#troubleshooting#claude-code#diagnostics

Recommended for


name: debug description: Enable debug logging for this session and help diagnose issues

Debug Skill

Help the user debug an issue they're encountering in this current Claude Code session.

Debug Logging Just Enabled

Debug logging was OFF for this session until now. Nothing prior to this /debug invocation was captured.

Tell the user that debug logging is now active at {debug_log_path}, ask them to reproduce the issue, then re-read the log. If they can't reproduce, they can also restart with claude --debug to capture logs from startup.

Session Debug Log

The debug log for the current session is at: {debug_log_path}

No log file exists yet.

For additional context, grep for [ERROR] and [WARN] lines across the full file.

Daemon

No daemon lock or status file found — the background daemon does not appear to be running. If the issue involves background sessions or claude agents, the daemon log (if any) is at {user_home}/.claude/daemon.log.

Issue Description

The user did not describe a specific issue. Read the debug log and summarize any errors, warnings, or notable issues.

Settings

Remember that settings are in:

  • user - {user_home}/.claude/settings.json
  • project - {working_directory}/.claude/settings.json
  • local - {working_directory}/.claude/settings.local.json

Instructions

  1. Review the user's issue description
  2. The last 20 lines show the debug file format. Look for [ERROR] and [WARN] entries, stack traces, and failure patterns across the file
  3. Consider launching the claude-code-guide subagent to understand the relevant Claude Code features
  4. Explain what you found in plain language
  5. Suggest concrete fixes or next steps
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