> ## 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.

# CompactionPart

> 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 CompactionPart = {
  id: string
  sessionID: string
  messageID: string
  type: "compaction"
  auto: boolean
  overflow?: boolean
  tail_start_id?: string
  customInstructions?: string
}
```


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