Retrieve a memory version

get /v1/memory_stores/{memory_store_id}/memory_versions/{memory_version_id}

Retrieve a memory version

Path Parameters

• memory_store_id: string

• memory_version_id: string

Query Parameters

• 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

• BetaManagedAgentsMemoryVersion object { id, created_at, memory_id, 10 more }

  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 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.

Example

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

Response

{
  "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"
  }
}

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