MCPInstall

errors

by yonatangrossBackend & APIs

Error pattern analysis and troubleshooting for Claude Code sessions. Categorizes errors (network, auth, model, tool, memory, permission) with known resolution patterns, searches memory for prior occurrences, and suggests recovery steps. Delegates to debug-investigator agent for complex root cause analysis. Use when handling errors, fixing failures, or troubleshooting session issues.

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/yonatangross/orchestkit --skill errors
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads errors automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

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

CommandPurposeScope
/errorsBatch analysis of error patterns (last 24h/7d)Historical patterns
/debugReal-time debug of current session stateCurrent session
fix-issueFull RCA workflow for specific bugSingle issue

CC 2.1.169+: for errors that survive /clear and restarts, claude --safe-mode boots with every customization disabled (CLAUDE.md/plugins/skills/hooks/MCP) — the one-step test that separates "ork/hook/MCP bug" from "CC bug" before deeper analysis.

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

FilePurpose
.claude/hooks/posttool/error-collector.shCaptures errors to JSONL
.claude/hooks/pretool/bash/error-pattern-warner.shWarns before risky commands
.claude/scripts/analyze_errors.pyBatch pattern analysis
.claude/rules/error_rules.jsonLearned error patterns
.claude/logs/errors.jsonlRaw error log

Common Patterns

Connection Refused / Wrong Port

pattern: ECONNREFUSED|connection refused|ERR_CONNECTION_REFUSED|connect ECONNREFUSED
fix: The port may have changed or the service isn't running.
     1. Check services: portless list (if installed)
     2. Use named URLs: api.localhost instead of localhost:PORT
     3. Fallback: lsof -iTCP -sTCP:LISTEN -nP | grep -E 'node|python|java'
     4. Install Portless to avoid port guessing: npm i -g portless

pattern: ERR_CONNECTION_RESET|ECONNRESET|socket hang up
fix: Service may have crashed. Check process logs, restart the service,
     and use agent-browser to verify the app is responding:
     agent-browser open "https://myapp.localhost"

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

Hook Errors (CC 2.1.98)

Since CC 2.1.98, hook errors show the first line of stderr directly in the transcript — no need for --debug:

pattern: hook.*error|hook.*failed|PreToolUse.*error
diagnosis: Read the stderr line shown in the transcript.
  1. If path error → check CLAUDE_PLUGIN_ROOT is set
  2. If JSON parse error → hook is returning invalid JSON
  3. If timeout → hook exceeds 50ms budget (PreToolUse) or 100ms (PostToolUse)
  4. If "module not found" → run: cd src/hooks && npm run build

Related Skills

  • 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"
}

FAQ

What does the errors skill do?

Error pattern analysis and troubleshooting for Claude Code sessions. Categorizes errors (network, auth, model, tool, memory, permission) with known resolution patterns, searches memory for prior occurrences, and suggests recovery steps. Delegates to debug-investigator agent for complex root cause analysis. Use when handling errors, fixing failures, or troubleshooting session issues.

How do I install errors?

Run npx skills add https://github.com/yonatangross/orchestkit --skill errors in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/errors/ (personal) or .claude/skills/errors/ (project).

Which AI agents can use errors?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is errors safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains errors?

It is published by yonatangross in yonatangross/orchestkit. It has 217 recorded installs.

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