Anthropic Knowledge Hub

List memory versions ​

get /v1/memory_stores/{memory_store_id}/memory_versions

List memory versions

Path Parameters ​

  • memory_store_id: string

Query Parameters ​

  • api_key_id: optional string

    Query parameter for api_key_id

  • "created_at[gte]": optional string

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

  • "created_at[lte]": optional string

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

  • limit: optional number

    Query parameter for limit

  • memory_id: optional string

    Query parameter for memory_id

  • operation: optional BetaManagedAgentsMemoryVersionOperation

    Query parameter for operation

    • "created"

    • "modified"

    • "deleted"

  • page: optional string

    Query parameter for page

  • session_id: optional string

    Query parameter for session_id

  • view: optional BetaManagedAgentsMemoryView

    Query parameter for view

    • "basic"

    • "full"

Header Parameters ​

  • "anthropic-beta": optional array of AnthropicBeta

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

    • string

    • "message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 22 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"

Returns ​

  • data: optional array of BetaManagedAgentsMemoryVersion

    One page of memory_version objects, ordered by created_at descending (newest first), with id as tiebreak.

    • 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 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: optional string

      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: optional string

      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: optional number

      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: optional 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.

      • BetaManagedAgentsSessionActor object { session_id, type }

        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 for further provenance.

        • type: "session_actor"

          • "session_actor"

      • BetaManagedAgentsAPIActor object { api_key_id, type }

        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 object { type, user_id }

        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: optional string

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

    • redacted_at: optional string

      A timestamp in RFC 3339 format

    • redacted_by: optional 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.

  • next_page: optional string

    Opaque cursor for the next page (a page_... value), or null if there are no more results. Pass as page on the next request.

Example ​

http
curl https://api.anthropic.com/v1/memory_stores/$MEMORY_STORE_ID/memory_versions \
    -H 'anthropic-version: 2023-06-01' \
    -H 'anthropic-beta: managed-agents-2026-04-01' \
    -H "X-Api-Key: $ANTHROPIC_API_KEY"

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"
}