List memory versions

beta.memory_stores.memory_versions.list(memory_store_id, **kwargs) -> PageCursor<BetaManagedAgentsMemoryVersion>

GET/v1/memory_stores/{memory_store_id}/memory_versions

Parameters

memory_store_id: String⁠Path

The ID of the memory store whose version history to list (memstore_...).

api_key_id: String⁠Query

Return only versions written with the API key that has this ID.

created_at_gte: Time⁠Query

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

formatdate-time

created_at_lte: Time⁠Query

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

formatdate-time

limit: Integer⁠Query

The maximum number of versions to return per page. Defaults to 20.

formatint32

memory_id: String⁠Query

Return only versions of the memory with this ID (mem_...).

The filter still works after the memory is deleted. The results then include the version whose operation is deleted.

operation: BetaManagedAgentsMemoryVersionOperation⁠Query

Return only versions that record this kind of change.

One of the following:

:created

The memory was created. The first version in any memory's lineage.

:modified

The memory's content, path, or both were changed via update. Writes the agent makes through the filesystem mount also appear as modified.

:deleted

The memory was deleted. The content, content_size_bytes, and content_sha256 fields are null on this version. The preceding version, while it is retained, records the deleted content's size and hash.

page: String⁠Query

The next_page value from a previous response, to get the next page. Omit it to get the first page.

service_account_id: String⁠Query

Return only versions written by the service account with this ID (svac_...).

session_id: String⁠Query

Return only versions written by the session with this ID.

view: BetaManagedAgentsMemoryView⁠Query

Selects which projection of a memory or memory_version the server returns. basic returns the object with content set to null; full populates content. When omitted, the default is endpoint-specific: retrieve operations default to full; list, create, and update operations default to basic. Listing with view=full caps limit at 20.

One of the following:

:basic

Return the object with content set to null. The content_size_bytes and content_sha256 fields remain populated, so sync clients can diff without fetching content.

:full

Return the object with content populated. On list endpoints, view=full caps limit at 20.

betas: Array[AnthropicBeta]⁠Header

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

One of the following:

String = String

:"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"

:"compact-2026-09-04"

:"inline-tools-2026-09-15"

:"mcp-client-2026-09-15"

:"ce-plugins-2026-09-01"

:"spend-limit-reads-2026-09-26"

workspace_id: String⁠Header

Optional header to select the Workspace for this request. The value is a Workspace ID (for example, wrkspc_011CZkZaBF1tNoB5wlCeusgy).

Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace.

Returns

class BetaManagedAgentsMemoryVersion { type: :memory_version, id, created_at, 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 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.

List memory versions

require "anthropic"

anthropic = Anthropic::Client.new(api_key: "my-anthropic-api-key")

page = anthropic.beta.memory_stores.memory_versions.list("memory_store_id")

puts(page)

Response 200

{
  "data": [
    {
      "id": "memver_011CZkZBJq5dWxk9fVLNcPht",
      "created_at": "2026-03-15T10:00:00Z",
      "memory_id": "mem_011CZkZ9X2dpNyB6YbtxvB6e",
      "memory_store_id": "memstore_01Wf3kQ8tZxB2mVr7HcJ4aNd",
      "operation": "created",
      "type": "memory_version",
      "content": null,
      "content_sha256": "ba7936d94c84d948a2232088f78228f175df6a8353b2d5bc9228eee5794a0024",
      "content_size_bytes": 28,
      "created_by": {
        "session_id": "sesn_011CZkZAtmR3yMPDzynEDxu7",
        "type": "session_actor"
      },
      "path": "/preferences/formatting.md",
      "redacted_at": null,
      "redacted_by": {
        "session_id": "x",
        "type": "session_actor"
      }
    }
  ],
  "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo="
}

Returns Examples

Response 200

{
  "data": [
    {
      "id": "memver_011CZkZBJq5dWxk9fVLNcPht",
      "created_at": "2026-03-15T10:00:00Z",
      "memory_id": "mem_011CZkZ9X2dpNyB6YbtxvB6e",
      "memory_store_id": "memstore_01Wf3kQ8tZxB2mVr7HcJ4aNd",
      "operation": "created",
      "type": "memory_version",
      "content": null,
      "content_sha256": "ba7936d94c84d948a2232088f78228f175df6a8353b2d5bc9228eee5794a0024",
      "content_size_bytes": 28,
      "created_by": {
        "session_id": "sesn_011CZkZAtmR3yMPDzynEDxu7",
        "type": "session_actor"
      },
      "path": "/preferences/formatting.md",
      "redacted_at": null,
      "redacted_by": {
        "session_id": "x",
        "type": "session_actor"
      }
    }
  ],
  "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo="
}