DiskBackend

reference

1 min readUpdated 2026-07-29

Kind: Class

Source: atloria-monorepo/libs/agent-core/src/context/checkpoint-backend.ts

Implements: CheckpointBackend

Methods

Method	Signature	Returns
`save`	`save(snap: Snapshot)`	`void`
`load`	`load(relPath: string)`	`Snapshot[]`
`loadLatest`	`loadLatest(relPath: string)`	`Snapshot
`deleteFile`	`deleteFile(relPath: string)`	`void`
`deleteFrom`	`deleteFrom(relPath: string, fromIndex: number)`	`void`
`getTrackedFiles`	`getTrackedFiles()`	`string[]`
`getTotalCount`	`getTotalCount()`	`number`
`getSnapshotCount`	`getSnapshotCount(relPath: string)`	`number`
`clear`	`clear()`	`void`
`evictOldest`	`evictOldest()`	`boolean`
`flush`	`flush()`	`void`

Properties

Property	Type
`sessionId`	`string`
`sessionDir`	`string`

Where it refuses work

DiskBackend stops the work with an early return when !snaps || snaps.length === 0, in 2 places.
DiskBackend stops the work with an early return when !snaps, in 2 places.
DiskBackend stops the work with an early return when fromIndex < 0 || fromIndex >= snaps.length.

When something fails

DiskBackend handles failure in 13 places: it discards it silently in 10, turns it into a return value in 2, and logs it and continues in 1.

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