## List memory versions

`client.beta.memoryStores.memoryVersions.list(stringmemoryStoreID, MemoryVersionListParamsparams?, RequestOptionsoptions?): PageCursor<BetaManagedAgentsMemoryVersion>`

**get** `/v1/memory_stores/{memory_store_id}/memory_versions`

List memory versions

### Parameters

- `memoryStoreID: string`

- `params: MemoryVersionListParams`

  - `api_key_id?: string`

    Query param: Query parameter for api_key_id

  - `"created_at[gte]"?: string`

    Query param: Return versions created at or after this time (inclusive).

  - `"created_at[lte]"?: string`

    Query param: Return versions created at or before this time (inclusive).

  - `limit?: number`

    Query param: Query parameter for limit

  - `memory_id?: string`

    Query param: Query parameter for memory_id

  - `operation?: BetaManagedAgentsMemoryVersionOperation`

    Query param: Query parameter for operation

    - `"created"`

    - `"modified"`

    - `"deleted"`

  - `page?: string`

    Query param: Query parameter for page

  - `session_id?: string`

    Query param: Query parameter for session_id

  - `view?: BetaManagedAgentsMemoryView`

    Query param: Query parameter for view

    - `"basic"`

    - `"full"`

  - `betas?: Array<AnthropicBeta>`

    Header param: Optional header to specify the beta version(s) you want to use.

    - `(string & {})`

    - `"message-batches-2024-09-24" | "prompt-caching-2024-07-31" | "computer-use-2024-10-22" | 25 more`

      - `"message-batches-2024-09-24"`

      - `"prompt-caching-2024-07-31"`

      - `"computer-use-2024-10-22"`

      - `"computer-use-2025-01-24"`

      - `"pdfs-2024-09-25"`

      - `"token-counting-2024-11-01"`

      - `"token-efficient-tools-2025-02-19"`

      - `"output-128k-2025-02-19"`

      - `"files-api-2025-04-14"`

      - `"mcp-client-2025-04-04"`

      - `"mcp-client-2025-11-20"`

      - `"dev-full-thinking-2025-05-14"`

      - `"interleaved-thinking-2025-05-14"`

      - `"code-execution-2025-05-22"`

      - `"extended-cache-ttl-2025-04-11"`

      - `"context-1m-2025-08-07"`

      - `"context-management-2025-06-27"`

      - `"model-context-window-exceeded-2025-08-26"`

      - `"skills-2025-10-02"`

      - `"fast-mode-2026-02-01"`

      - `"output-300k-2026-03-24"`

      - `"user-profiles-2026-03-24"`

      - `"advisor-tool-2026-03-01"`

      - `"managed-agents-2026-04-01"`

      - `"cache-diagnosis-2026-04-07"`

      - `"thinking-token-count-2026-05-13"`

      - `"server-side-fallback-2026-06-01"`

      - `"fallback-credit-2026-06-01"`

### Returns

- `BetaManagedAgentsMemoryVersion`

  A `memory_version` object: one immutable, attributed row in a memory's append-only history. Every non-no-op mutation to a memory produces a new version. Versions belong to the store (not the individual memory) and persist after the memory is deleted. Retrieving a redacted version returns 200 with `content`, `path`, `content_size_bytes`, and `content_sha256` set to `null`; branch on `redacted_at`, not HTTP status.

  - `id: string`

    Unique identifier for this version (a `memver_...` value).

  - `created_at: string`

    A timestamp in RFC 3339 format

  - `memory_id: string`

    ID of the memory this version snapshots (a `mem_...` value). Remains valid after the memory is deleted; pass it as `memory_id` to [List memory versions](/docs/en/api/beta/memory_stores/memory_versions/list) to retrieve the full lineage including the `deleted` row.

  - `memory_store_id: string`

    ID of the memory store this version belongs to (a `memstore_...` value).

  - `operation: BetaManagedAgentsMemoryVersionOperation`

    The kind of mutation a `memory_version` records. Every non-no-op mutation to a memory appends exactly one version row with one of these values.

    - `"created"`

    - `"modified"`

    - `"deleted"`

  - `type: "memory_version"`

    - `"memory_version"`

  - `content?: string | null`

    The memory's UTF-8 text content as of this version. `null` when `view=basic`, when `operation` is `deleted`, or when `redacted_at` is set.

  - `content_sha256?: string | null`

    Lowercase hex SHA-256 digest of `content` as of this version (64 characters). `null` when `redacted_at` is set or `operation` is `deleted`. Populated regardless of `view` otherwise.

  - `content_size_bytes?: number | null`

    Size of `content` in bytes as of this version. `null` when `redacted_at` is set or `operation` is `deleted`. Populated regardless of `view` otherwise.

  - `created_by?: BetaManagedAgentsActor`

    Identifies who performed a write or redact operation. Captured at write time on the `memory_version` row. The API key that created a session is not recorded on agent writes; attribution answers who made the write, not who is ultimately responsible. Look up session provenance separately via the [Sessions API](/docs/en/api/sessions-retrieve).

    - `BetaManagedAgentsSessionActor`

      Attribution for a write made by an agent during a session, through the mounted filesystem at `/mnt/memory/`.

      - `session_id: string`

        ID of the session that performed the write (a `sesn_...` value). Look up the session via [Retrieve a session](/docs/en/api/sessions-retrieve) for further provenance.

      - `type: "session_actor"`

        - `"session_actor"`

    - `BetaManagedAgentsAPIActor`

      Attribution for a write made directly via the public API (outside of any session).

      - `api_key_id: string`

        ID of the API key that performed the write. This identifies the key, not the secret.

      - `type: "api_actor"`

        - `"api_actor"`

    - `BetaManagedAgentsUserActor`

      Attribution for a write made by a human user through the Anthropic Console.

      - `type: "user_actor"`

        - `"user_actor"`

      - `user_id: string`

        ID of the user who performed the write (a `user_...` value).

  - `path?: string | null`

    The memory's path at the time of this write. `null` if and only if `redacted_at` is set.

  - `redacted_at?: string | null`

    A timestamp in RFC 3339 format

  - `redacted_by?: BetaManagedAgentsActor`

    Identifies who performed a write or redact operation. Captured at write time on the `memory_version` row. The API key that created a session is not recorded on agent writes; attribution answers who made the write, not who is ultimately responsible. Look up session provenance separately via the [Sessions API](/docs/en/api/sessions-retrieve).

### Example

```typescript
import Anthropic from '@anthropic-ai/sdk';

const client = new Anthropic({
  apiKey: process.env['ANTHROPIC_API_KEY'], // This is the default and can be omitted
});

// Automatically fetches more pages as needed.
for await (const betaManagedAgentsMemoryVersion of client.beta.memoryStores.memoryVersions.list(
  'memory_store_id',
)) {
  console.log(betaManagedAgentsMemoryVersion.id);
}
```

#### Response

```json
{
  "data": [
    {
      "id": "id",
      "created_at": "2019-12-27T18:11:19.117Z",
      "memory_id": "memory_id",
      "memory_store_id": "memory_store_id",
      "operation": "created",
      "type": "memory_version",
      "content": "content",
      "content_sha256": "content_sha256",
      "content_size_bytes": 0,
      "created_by": {
        "session_id": "x",
        "type": "session_actor"
      },
      "path": "path",
      "redacted_at": "2019-12-27T18:11:19.117Z",
      "redacted_by": {
        "session_id": "x",
        "type": "session_actor"
      }
    }
  ],
  "next_page": "next_page"
}
```
