# LangSmith — card for AI agents

Tracing, evaluation and monitoring of LLM apps and agents, including prompt and dataset management.

Maker: LangChain · category: LLM observability and evals

## Price (official page)
- Free tier: Developer plan: 1 seat, up to 5k base traces / mo, then pay-as-you-go
- Paid from $39/month
- Usage price: Plus: $39 / seat per month incl. up to 10k base traces / mo; trace overage is pay-as-you-go (rate not listed on pricing page); 1 LSU = $1 (Deployment/Fleet/Sandbox usage)
- Pricing page: https://www.langchain.com/pricing (checked 2026-10-09)
- Note: Base traces have 14-day retention, extended traces 180-day retention at an extra fee. Enterprise is custom pricing.

## Connect
- Official MCP server: https://docs.langchain.com/langsmith/langsmith-mcp-server
- npm: `npm install langsmith`
- PyPI: `pip install langsmith`
- Repository: https://github.com/langchain-ai/langsmith-sdk

## Other APIs in this category
- Pydantic Logfire: https://agentgid.com/apis/logfire/agent.md
- Laminar: https://agentgid.com/apis/laminar/agent.md
- W&B Weave: https://agentgid.com/apis/wandb-weave/agent.md
- Ragas: https://agentgid.com/apis/ragas/agent.md
- LangWatch: https://agentgid.com/apis/langwatch/agent.md

## Links
- AgentGid page: https://agentgid.com/apis/langsmith/

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AgentGid's catalog is curated: every entry was checked against the maker's official pages (registry, repository, license and pricing pages) on the date shown; a license value shows the quote it stands on wherever AgentGid has one. Usage numbers come from AgentGid's own scan of public repositories set up for AI coding agents. Claims by makers are reported, not tested by AgentGid.