Error pattern analysis and troubleshooting for Claude Code sessions. Use when handling errors, fixing failures, troubleshooting issues.

Reference low

Primary Agent: debug-investigator

Error Pattern Analysis

Analyze errors captured from Claude Code sessions to identify patterns and get actionable insights.

Quick Start

/errors              # Batch analysis of historical error patterns
/debug               # CC 2.1.30 real-time debug for current session

When to Use Which

Command	Purpose	Scope
`/errors`	Batch analysis of error patterns (last 24h/7d)	Historical patterns
`/debug`	Real-time debug of current session state	Current session
`/ork:fix-issue`	Full RCA workflow for specific bug	Single issue

Quick Analysis

# Run batch analysis on last 24h of errors
python .claude/scripts/analyze_errors.py

# Analyze last 7 days
python .claude/scripts/analyze_errors.py --days 7

# Generate markdown report
python .claude/scripts/analyze_errors.py --report

What Gets Captured

The error collector hook captures:

Tool name (Bash, mcp__memory__search_nodes, etc.)
Error message (first 500 chars)
Tool input (command/query that failed)
Timestamp and session ID

Location: .claude/logs/errors.jsonl

Current Error Rules

Check learned patterns that trigger warnings:

cat .claude/rules/error_rules.json | jq '.rules[] | {id, signature, count: .occurrence_count}'

Files

File	Purpose
`.claude/hooks/posttool/error-collector.sh`	Captures errors to JSONL
`.claude/hooks/pretool/bash/error-pattern-warner.sh`	Warns before risky commands
`.claude/scripts/analyze_errors.py`	Batch pattern analysis
`.claude/rules/error_rules.json`	Learned error patterns
`.claude/logs/errors.jsonl`	Raw error log

Common Patterns

PostgreSQL Connection Errors

pattern: role "X" does not exist
fix: Use Docker connection: docker exec -it orchestkit-postgres-dev psql -U orchestkit_user -d orchestkit_dev

pattern: relation "X" does not exist
fix: Check MCP postgres server connection string - may be connected to wrong database

ork:fix-issue: Fix identified errors
debug-investigator: Debug error root causes

Adding New Rules

Rules are auto-generated by analyze_errors.py when patterns repeat 2+ times. For manual rules, edit .claude/rules/error_rules.json:

{
  "id": "custom-001",
  "pattern": "your regex pattern",
  "signature": "human readable signature",
  "tool": "Bash",
  "occurrence_count": 1,
  "fix_suggestion": "How to fix this"
}

Errors

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