Migrating

Two guides for the two most common starting points. Each maps concept-for-concept, shows a side-by-side rewrite, and calls out what you lose (there is always something) and what you gain.

• From LangChain

  ---

  You already have chains, tools, and an AgentExecutor. Here's the concept-to-concept mapping, a full before/after, and an honest read on where LangChain still wins (large integration catalog).

  :octicons-arrow-right-24: Read the LangChain guide

• From vanilla asyncio + provider SDK

  ---

  You wrote your own messages.create loop with a for over tool calls. Here's the same loop as a ReActCognition and every resilience/cancel/budget primitive you were about to write yourself.

  :octicons-arrow-right-24: Read the asyncio guide

If your starting point is LlamaIndex, this round doesn't have a dedicated guide — the shapes differ enough (LlamaIndex is retrieval-first, agentkit is composition-first) that a direct mapping would mislead more than help. Read the Cheatsheet and Why agentkit instead, and open an issue if a proper guide would help.