🔍 LangSmith Fetch Skill for Claude Code

AI observability & debugging skill for Claude!

Debug LangChain and LangGraph agents by fetching execution traces from LangSmith Studio directly in your terminal using Claude Code.

🎯 What It Does

This Claude Code skill teaches Claude how to debug your LangChain and LangGraph agents by automatically fetching and analyzing execution traces from LangSmith Studio.

Just ask Claude:

• "Debug my agent"
• "What went wrong?"
• "Show me recent traces"
• "Why is my agent slow?"

Claude will automatically fetch traces, analyze execution patterns, identify errors, and provide actionable insights!

✨ Features

• 🐛 Automatic Debugging - Claude fetches and analyzes traces autonomously
• 🔍 Error Detection - Identifies failures and root causes
• 📊 Performance Analysis - Tracks execution time and token usage
• 💾 Memory Operations - Checks LTM recall/store operations
• 🛠️ Tool Call Analysis - Reviews which tools were called and why
• 📁 Session Export - Saves debugging sessions for later review
• 🤝 Multi-Agent Support - Debugs orchestration decisions

🚀 Quick Start

1. Install Prerequisites

# Install langsmith-fetch CLI
pip install langsmith-fetch

2. Configure Environment

# Set your LangSmith credentials
export LANGSMITH_API_KEY="your_langsmith_api_key"
export LANGSMITH_PROJECT="your_project_name"

Get your API key from: https://smith.langchain.com/

3. Install the Skill

npx skills add OthmanAdi/langsmith-fetch-skill --skill langsmith-fetch -g

Works with Claude Code, Cursor, Codex, Gemini CLI, and 40+ agents supporting the Agent Skills spec.

mkdir -p ~/.claude/skills/langsmith-fetch
curl -o ~/.claude/skills/langsmith-fetch/SKILL.md https://raw.githubusercontent.com/OthmanAdi/langsmith-fetch-skill/main/SKILL.md

mkdir -p .claude/skills/langsmith-fetch
curl -o .claude/skills/langsmith-fetch/SKILL.md https://raw.githubusercontent.com/OthmanAdi/langsmith-fetch-skill/main/SKILL.md
git add .claude/skills/
git commit -m "Add LangSmith Fetch skill"
git push

4. Use with Claude

Open Claude Code and ask:

Debug my agent - what happened in the last 5 minutes?

Claude will automatically use this skill! 🎉

💡 Usage Examples

Example 1: Quick Debug

You: "Debug my agent"

Claude:
Found 3 traces in the last 5 minutes:

Trace 1: ✅ Success
- Agent: memento
- Tools: recall_memories, create_entities
- Duration: 2.3s
- Tokens: 1,245

Trace 2: ❌ Error
- Agent: cypher
- Error: "Neo4j connection timeout"
- Duration: 15.1s
- Failed at: search_nodes tool

💡 Issue: Neo4j timeout. Check database connection and add retry logic.

Example 2: Error Investigation

You: "Why did trace abc123 fail?"

Claude:
Deep Dive Analysis - Trace abc123

Goal: User asked "Find all projects"

Execution Flow:
1. ✅ search_nodes → Found 24 nodes
2. ❌ get_node_details → Error: "Node not found"

Root Cause: Search returned deleted node IDs

Suggested Fix:
1. Add error handling in get_node_details
2. Filter deleted nodes in search results

Example 3: Performance Analysis

You: "Why is my agent slow?"

Claude:
Performance Analysis - Last 30 minutes

Average execution time: 8.7s
Slowest operation: search_nodes (6.2s avg)
Token usage: 2,145 tokens/trace

Bottlenecks:
1. Neo4j queries taking 71% of time
2. Large context window (15K tokens)

Recommendations:
1. Add database indexes
2. Implement context trimming
3. Cache frequently accessed nodes

🎓 How It Works

1. Claude listens for debugging-related questions
2. Automatically activates this skill when appropriate
3. Runs langsmith-fetch commands to get trace data
4. Analyzes execution patterns, errors, and performance
5. Presents insights in human-readable format

📚 Capabilities

✅ What Claude Can Do

• Fetch recent traces (last N minutes)
• Analyze specific trace by ID
• Export debugging sessions to files
• Detect and categorize errors
• Review tool calls and results
• Check memory operations (LTM)
• Track token usage and costs
• Compare agent performance
• Identify bottlenecks
• Suggest optimizations

🔧 Supported Commands

The skill uses these langsmith-fetch commands:

langsmith-fetch traces         # Get recent traces
langsmith-fetch trace <id>     # Get specific trace
langsmith-fetch threads        # Get conversations
langsmith-fetch config         # Manage configuration

🛠️ Configuration

Environment Variables

Required:

LANGSMITH_API_KEY    # Your LangSmith API key
LANGSMITH_PROJECT    # Your project name

Optional:

LANGCHAIN_ENDPOINT   # Custom endpoint (default: https://api.smith.langchain.com)

Making Variables Persistent

Add to ~/.bashrc or ~/.zshrc:

echo 'export LANGSMITH_API_KEY="your_key"' >> ~/.bashrc
echo 'export LANGSMITH_PROJECT="your_project"' >> ~/.bashrc
source ~/.bashrc

🔍 Troubleshooting

"No traces found"

Cause: No recent agent activity or tracing disabled

Fix:

# Check environment
echo $LANGSMITH_API_KEY
echo $LANGSMITH_PROJECT

# Try longer timeframe
langsmith-fetch traces --last-n-minutes 1440 --limit 50

# Verify tracing is enabled
# In your code: LANGCHAIN_TRACING_V2=true

Skill not activating

Fix:

1. Ensure SKILL.md is in ~/.claude/skills/langsmith-fetch/
2. Restart Claude Code
3. Use specific trigger phrases: "debug my agent", "show traces"

Command not found

Fix:

# Verify langsmith-fetch is installed
pip list | grep langsmith-fetch

# Reinstall if needed
pip install --upgrade langsmith-fetch

🤝 Contributing

We welcome contributions! See CONTRIBUTING.md for guidelines.

Ideas for contributions:

• Additional analysis workflows
• More debugging patterns
• Performance optimization tips
• Better error categorization
• Integration examples

📖 Resources

• LangSmith Fetch CLI: https://github.com/langchain-ai/langsmith-fetch
• LangSmith Studio: https://smith.langchain.com/
• LangChain Docs: https://docs.langchain.com/
• Claude Code Skills: https://code.claude.com/docs/en/skills
• Awesome Claude Skills: https://github.com/ComposioHQ/awesome-claude-skills

📝 License

MIT © Ahmad Othman Ammar Adi

👨‍💻 Author

Ahmad Othman Ammar Adi

• 🏢 AI Agents Orchestrator at migRaven
• 🌐 Website: othmanadi.com
• 💼 LinkedIn: codingwithadi
• 🐙 GitHub: @OthmanAdi

🌟 Show Your Support

If this skill helps you debug your agents, please:

• ⭐ Star this repository
• 🐛 Report issues you find
• 💡 Suggest improvements
• 🤝 Contribute enhancements
• 📢 Share with the community

🔗 Related Projects

• PromptFusion - Semantic weighted prompt composition for AI agents

📊 Stats

• Version: 0.1.0
• Status: Active Development
• First Released: December 2025
• Category: AI Observability & Debugging

🎄 Season's Greetings

Wishing you a Merry Christmas and a Happy New Year 2026! 🎉 May your agents run smoothly and your debugging be swift in the year ahead!

(This message will be updated in future releases)

Built with ❤️ by Ahmad Othman Ammar Adi for the AI debugging community