langsmith-trace

npx skills add majiayu000/claude-skill-registry --skill langsmith-trace --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

<oneliner> Two main topics: **adding tracing** to your application, and **querying traces** for debugging and analysis. Python and Javascript implementations are both supported. </oneliner> <setup> Environment Variables ```bash LANGSMITH_API_KEY=lsv2_pt_your_api_key_here # Required LANGSMITH_PROJECT=your-project-name # Optional: default project LANGSMITH_WORKSPACE_ID=your-workspace-id # Optional: for org-scoped keys ``` **IMPORTANT:** Always check the environment variables or `.env` file for `LANGSMITH_PROJECT` before querying or interacting with LangSmith. This tells you which project contains the relevant traces and data. If the LangSmith project is not available, use your best judgement to identify the right one. CLI Tool ```bash curl -sSL https://raw.githubusercontent.com/langchain-ai/langsmith-cli/main/scripts/install.sh | sh ``` </setup> <trace_langchain_oss> For LangChain/LangGraph apps, tracing is automatic. Just set environment variables: ```bash export LANGSMITH_TRACING=true export LANGSMITH_API_KEY=<your-api-key> export OPENAI_API_KEY=<your-openai-api-key> # or your LLM provider's key ``` Optional variables: - `LANGSMITH_PROJECT` - specify project name (defaults to "defa

curl -sSL https://raw.githubusercontent.com/langchain-ai/langsmith-cli/main/scripts/install.sh | sh
export LANGSMITH_TRACING=true
export LANGSMITH_API_KEY=<your-api-key>
export OPENAI_API_KEY=<your-openai-api-key>  # or your LLM provider's key
List recent traces (most common operation)
langsmith trace list --limit 10 --project my-project
List traces with metadata (timing, tokens, costs)
langsmith trace list --limit 10 --include-metadata
Filter traces by time
langsmith trace list --last-n-minutes 60