# PostCompactionHook

**Kind:** Type

**Source:** [`atloria-monorepo/libs/agent-core/src/session/types.ts`](https://github.com/sherkety/atloria/blob/main/atloria-monorepo/libs/agent-core/src/session/types.ts#L25)

Callback invoked after context compaction. Receives recently accessed file paths.
Returns file contents to inject as synthetic context items.
This enables "hard rehydration" — automatically restoring working context
after compaction, matching Claude Code's behavior.

## Definition

```ts
(recentFiles: string[]) => Promise<RehydrationItem[]> | RehydrationItem[]
```