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LangChain / LangGraph

Open source

The default agent-engineering toolkit. Use LangGraph when the workflow needs state, retries, and branches — not a single prompt loop.

No cardMM-friendlySelf-hostableAPI
Official siteGitHub

Free tier

Open-source libraries. Hosted LangSmith is optional and paid at scale.

Limits

Easy to over-abstract. A 40-line script often beats an early graph.

Best for

  • Custom agents
  • Tool-calling apps
  • Stateful graphs

How to use it well

  1. Start with one tool and one model. Add a graph only when the linear chain fails.
  2. Log every tool call. Agent bugs hide in unobserved side effects.
  3. Keep secrets in env vars. Never commit provider keys.

Myanmar notes

Run locally first. Hosted tracing is optional and can wait until you have a card.