langsmith-fetch

Installation
Summary

Fetch and analyze LangChain and LangGraph execution traces from LangSmith Studio for agent debugging.

  • Retrieves recent traces and performs root-cause analysis on agent failures, tool calls, memory operations, and performance issues
  • Supports multiple output formats (pretty, JSON, raw) and time-based filtering to isolate specific execution windows
  • Includes four core workflows: quick debug of recent activity, deep-dive analysis of specific traces, session export with metadata, and error detection across multiple traces
  • Requires langsmith-fetch CLI installation and LangSmith API credentials via environment variables
SKILL.md

LangSmith Fetch - Agent Debugging Skill

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

When to Use This Skill

Automatically activate when user mentions:

  • 🐛 "Debug my agent" or "What went wrong?"
  • 🔍 "Show me recent traces" or "What happened?"
  • ❌ "Check for errors" or "Why did it fail?"
  • 💾 "Analyze memory operations" or "Check LTM"
  • 📊 "Review agent performance" or "Check token usage"
  • 🔧 "What tools were called?" or "Show execution flow"

Prerequisites

1. Install langsmith-fetch

pip install langsmith-fetch
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Jan 20, 2026