Beta › Memory Stores › Memory Versions

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).

  format: date-time

• "created_at[lte]": optional string

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

  format: date-time

• limit: optional number

  Query parameter for limit

  format: int32

• 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

• service_account_id: optional string

  Query parameter for service_account_id

• session_id: optional string

  Query parameter for session_id

• view: optional BetaManagedAgentsMemoryView

  Query parameter for view

  • "basic"

  • "full"

Headers

• "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 42 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"

    • "user-profiles-2026-08-18"

    • "user-profiles-2026-09-04"

    • "advisor-tool-2026-03-01"

    • "managed-agents-2026-04-01"

    • "cache-diagnosis-2026-04-07"

    • "dreaming-2026-04-21"

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

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

    • "server-side-fallback-2026-07-01"

    • "fallback-credit-2026-06-01"

    • "fallback-credit-2026-07-01"

    • "agent-memory-2026-07-22"

    • "mid-conversation-tool-changes-2026-07-01"

    • "compact-2026-01-12"

    • "computer-use-2025-11-24"

    • "mcp-tunnels-2026-06-22"

    • "structured-outputs-2025-11-13"

    • "task-budgets-2026-03-13"

    • "thinking-display-updates-2026-08-18"

    • "ce-user-management-2026-07-13"

    • "mid-conversation-output-config-2026-07-01"

    • "thinking-binding-controls-2026-08-01"

    • "mid-conversation-system-clear-at-2026-08-21"

• "anthropic-workspace-id": optional string

Returns

• data: optional array of BetaManagedAgentsMemoryVersion

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

  • type: "memory_version"

  • id: string

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

  • created_at: string

    A timestamp in RFC 3339 format

    format: date-time

  • 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 memory's retained versions, including the deleted row while the lineage is retained.

  • 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"

  • content: optional string or 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: optional string or 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: optional number or 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.

    format: int32

  • 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

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

      • type: "session_actor"

      • 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.

        minLength: 1

    • BetaManagedAgentsAPIActor object

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

      • type: "api_actor"

      • api_key_id: string

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

        minLength: 1

    • BetaManagedAgentsUserActor object

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

      • type: "user_actor"

      • user_id: string

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

        minLength: 1

    • BetaManagedAgentsServiceAccountActor object

      Attribution for a write made by a workload authenticated as a service account, for example via Workload Identity Federation.

      • type: "service_account_actor"

      • service_account_id: string

        ID of the service account that performed the write (a svac_... value).

        minLength: 1

  • path: optional string or null

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

  • redacted_at: optional string or null

    A timestamp in RFC 3339 format

    format: date-time

  • 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 or null

  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

curl https://api.anthropic.com/v1/memory_stores/$MEMORY_STORE_ID/memory_versions \
    -H 'anthropic-version: 2023-06-01' \
    -H 'anthropic-beta: agent-memory-2026-07-22' \
    -H "X-Api-Key: $ANTHROPIC_API_KEY"

Response (200)

{
  "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"
}

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"

Headers

• "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 42 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"

    • "user-profiles-2026-08-18"

    • "user-profiles-2026-09-04"

    • "advisor-tool-2026-03-01"

    • "managed-agents-2026-04-01"

    • "cache-diagnosis-2026-04-07"

    • "dreaming-2026-04-21"

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

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

    • "server-side-fallback-2026-07-01"

    • "fallback-credit-2026-06-01"

    • "fallback-credit-2026-07-01"

    • "agent-memory-2026-07-22"

    • "mid-conversation-tool-changes-2026-07-01"

    • "compact-2026-01-12"

    • "computer-use-2025-11-24"

    • "mcp-tunnels-2026-06-22"

    • "structured-outputs-2025-11-13"

    • "task-budgets-2026-03-13"

    • "thinking-display-updates-2026-08-18"

    • "ce-user-management-2026-07-13"

    • "mid-conversation-output-config-2026-07-01"

    • "thinking-binding-controls-2026-08-01"

    • "mid-conversation-system-clear-at-2026-08-21"

• "anthropic-workspace-id": optional string

Returns

• BetaManagedAgentsMemoryVersion object

  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 are not deleted with the memory; each version is retained for at least the version retention period after it was written, unless the store itself 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.

  • type: "memory_version"

  • id: string

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

  • created_at: string

    A timestamp in RFC 3339 format

    format: date-time

  • 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 memory's retained versions, including the deleted row while the lineage is retained.

  • 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"

  • content: optional string or 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: optional string or 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: optional number or 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.

    format: int32

  • 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

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

      • type: "session_actor"

      • 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.

        minLength: 1

    • BetaManagedAgentsAPIActor object

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

      • type: "api_actor"

      • api_key_id: string

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

        minLength: 1

    • BetaManagedAgentsUserActor object

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

      • type: "user_actor"

      • user_id: string

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

        minLength: 1

    • BetaManagedAgentsServiceAccountActor object

      Attribution for a write made by a workload authenticated as a service account, for example via Workload Identity Federation.

      • type: "service_account_actor"

      • service_account_id: string

        ID of the service account that performed the write (a svac_... value).

        minLength: 1

  • path: optional string or null

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

  • redacted_at: optional string or null

    A timestamp in RFC 3339 format

    format: date-time

  • 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: agent-memory-2026-07-22' \
    -H "X-Api-Key: $ANTHROPIC_API_KEY"

Response (200)

{
  "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"
  }
}

Redact a memory version

POST /v1/memory_stores/\{memory_store_id\}/memory_versions/\{memory_version_id\}/redact

Redact a memory version

Path parameters

• memory_store_id: string

• memory_version_id: string

Headers

• "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 42 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"

    • "user-profiles-2026-08-18"

    • "user-profiles-2026-09-04"

    • "advisor-tool-2026-03-01"

    • "managed-agents-2026-04-01"

    • "cache-diagnosis-2026-04-07"

    • "dreaming-2026-04-21"

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

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

    • "server-side-fallback-2026-07-01"

    • "fallback-credit-2026-06-01"

    • "fallback-credit-2026-07-01"

    • "agent-memory-2026-07-22"

    • "mid-conversation-tool-changes-2026-07-01"

    • "compact-2026-01-12"

    • "computer-use-2025-11-24"

    • "mcp-tunnels-2026-06-22"

    • "structured-outputs-2025-11-13"

    • "task-budgets-2026-03-13"

    • "thinking-display-updates-2026-08-18"

    • "ce-user-management-2026-07-13"

    • "mid-conversation-output-config-2026-07-01"

    • "thinking-binding-controls-2026-08-01"

    • "mid-conversation-system-clear-at-2026-08-21"

• "anthropic-workspace-id": optional string

Returns

• BetaManagedAgentsMemoryVersion object

  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 are not deleted with the memory; each version is retained for at least the version retention period after it was written, unless the store itself 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.

  • type: "memory_version"

  • id: string

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

  • created_at: string

    A timestamp in RFC 3339 format

    format: date-time

  • 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 memory's retained versions, including the deleted row while the lineage is retained.

  • 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"

  • content: optional string or 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: optional string or 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: optional number or 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.

    format: int32

  • 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

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

      • type: "session_actor"

      • 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.

        minLength: 1

    • BetaManagedAgentsAPIActor object

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

      • type: "api_actor"

      • api_key_id: string

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

        minLength: 1

    • BetaManagedAgentsUserActor object

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

      • type: "user_actor"

      • user_id: string

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

        minLength: 1

    • BetaManagedAgentsServiceAccountActor object

      Attribution for a write made by a workload authenticated as a service account, for example via Workload Identity Federation.

      • type: "service_account_actor"

      • service_account_id: string

        ID of the service account that performed the write (a svac_... value).

        minLength: 1

  • path: optional string or null

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

  • redacted_at: optional string or null

    A timestamp in RFC 3339 format

    format: date-time

  • 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/redact \
    -X POST \
    -H 'anthropic-version: 2023-06-01' \
    -H 'anthropic-beta: agent-memory-2026-07-22' \
    -H "X-Api-Key: $ANTHROPIC_API_KEY"

Response (200)

{
  "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"
  }
}