> ## Documentation Index
> Fetch the complete documentation index at: https://cognitio-agent.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# EventMessagePartDelta

> Exact type definition referenced by the public SDK.

This definition is generated from the same source as the SDK. Protocol types describe the runtime HTTP API; prefer the high-level SDK for session ownership and callbacks.

```ts theme={null}
export type EventMessagePartDelta = {
  type: "message.part.delta"
  properties: {
    sessionID: string
    messageID: string
    partID: string
    field: string
    delta: string
  }
}
```


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.