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Adapters tell Charm how to call your agent code. Different frameworks expose different runtime objects, so the adapter bridges your code to the Charm runner.

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Supported Adapter Types

TypeBest ForEntry Point Style
customPlain Python functions/classesmodule:object
langchainLangChain chains/runnablesmodule:chain
langgraphLangGraph graphsmodule:graph
crewaiCrewAI crewsmodule:crew
openclawOpenClaw/browser-tool agentsOpenClaw host

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Configure an Adapter

runtime:
  adapter:
    type: "custom"
    entry_point: "src.main:agent"

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Choosing an Adapter

  • Use custom for Python agent that do not use any frameworks.
  • Use langchain, langgraph, or crewai when you already use that framework.
  • Use openclaw for OpenClaw based agents.

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Third-party adapter plugins

Any pip package can register additional runtime.adapter.type values via [project.entry-points."charm.adapters"]. These require a custom runtime image on the cloud runner. See Extensibility Overview and Custom Adapters.

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Adapter Pages