LangSmith Trace

Add tracing to your agent and query traces for debugging. Supports Python and TypeScript.

[!IMPORTANT] This skill is tuned for AgentSeek template backends (LangGraph + middleware stacks). For general LangSmith concepts, see the upstream langsmith-skills repo.

[!CAUTION] Never pass --api-key as a CLI flag or expose API keys in shell commands / tool calls. The CLI reads LANGSMITH_API_KEY from the environment automatically. Using --api-key <value> leaks secrets into shell history, process listings, and agent tool-call logs. Always rely on the environment variable set in your shell profile or .env file.

Installation & Setup

1. Install the CLI

curl -sSL https://raw.githubusercontent.com/langchain-ai/langsmith-cli/main/scripts/install.sh | sh

The binary installs to ~/.local/bin/langsmith. If langsmith is not found after install, add to your shell profile: