# Transport API Reference
URL: /docs/api-reference/transport

Transport commands, frame messages, and protocol types for synchronizing assistant-ui runtimes across process or iframe boundaries.

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Transport APIs are for runtimes that cross a network, worker, iframe, or other execution boundary. They document the command and frame contracts that keep assistant-ui state synchronized with an external process.

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## Pages \[#pages]

<Cards>
  <Card title="&#x22;Assistant Transport&#x22;" href="&#x22;/docs/api-reference/transport/assistant-transport&#x22;">
    {"Command, protocol, and transport types for connecting assistant-ui runtimes across execution boundaries."}
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  <Card title="&#x22;Assistant Frame&#x22;" href="&#x22;/docs/api-reference/transport/frame&#x22;">
    {"Frame bridge APIs and serialized message types for embedding assistant-ui runtimes in external contexts."}
  </Card>
</Cards>