What: Filter debug messages by category using --debug=pattern syntax How to use:
# Show only MCP-related debug messages
claude --debug=mcp <command>
# Show all debug messages except verbose ones
claude --debug=!verbose <command>
# Show multiple specific categories
claude --debug=mcp,server1,api <command>Details:
- Supports both include patterns (show only these) and exclude patterns with
!prefix (hide these) - Automatically categorizes messages based on prefixes, MCP server names, and other patterns
- Cannot mix include and exclude patterns in the same filter
- Helps reduce noise when debugging specific components