## Update a memory layer

`memory_layers.update(id, **kwargs) -> MemoryLayer`

**patch** `/v1/workspaces/{workspaceId}/memory_layers/{id}`

Updates a memory layer in the workspace

### Parameters

- `workspace_id: String`

- `id: String`

- `metadata: UpdateResourceMetadata`

  UpdateResourceMetadata contains the user-provided fields for updating
  a workspace-scoped resource. Read-only fields (id, account_id, workspace_id, profile_id,
  created_at) are excluded since they are set by the server.

  - `name: String`

    Human-readable name for the resource (e.g., "Customer Support Agent", "Email Tool")

  - `bundle_key: String`

    Optional bundle ownership key. See ResourceMetadata.bundle_key.

  - `external_id: String`

    External ID for the resource (e.g., a workflow ID from an external system)

  - `labels: Hash[Symbol, String]`

    Arbitrary key-value pairs for categorization and filtering
    Examples: {"environment": "production", "team": "platform", "version": "v2"}

- `spec: MemoryLayerSpec`

  - `type: :MEMORY_LAYER_TYPE_UNSPECIFIED | :MEMORY_LAYER_TYPE_EPISODIC | :MEMORY_LAYER_TYPE_SKILLS`

    - `:MEMORY_LAYER_TYPE_UNSPECIFIED`

    - `:MEMORY_LAYER_TYPE_EPISODIC`

    - `:MEMORY_LAYER_TYPE_SKILLS`

  - `description: String`

    Human-readable description of the layer's purpose. Encouraged for
    user-created layers; system-managed layers may have a generated description.

  - `expires_at: Time`

    For layers with a finite lifetime (e.g., episodic), the time at which the
    layer becomes eligible for cleanup. Set by the system; unset for
    persistent layers.

  - `system_managed: bool`

    Server-set. True for layers managed by the system (e.g., episodic layers
    created automatically when an objective uses an episodic_key). System-managed
    layers cannot be assigned to objective stacks via the API and cannot be
    mutated by clients — their lifecycle is controlled entirely by the runtime.

- `update_mask: String`

### Returns

- `class MemoryLayer`

  MemoryLayer is a named container of memory entries that can be composed into
  an objective's memory stack. Layers are workspace-scoped resources. The layer
  type controls how its entries participate in the agent loop — see
  MemoryLayerType for details.

  See "Memory stack composition" above for how layers compose at lookup time.

  - `metadata: ResourceMetadata`

    Standard metadata for persistent, named resources (e.g., agents, tools, prompts)

    - `id: String`

      Unique identifier for the resource (prefixed ULID, e.g., "agent_01HXK...")

    - `account_id: String`

      Account this resource belongs to for multi-tenant isolation (prefixed ULID)

    - `created_at: Time`

      Timestamp when this resource was created

    - `name: String`

      Human-readable name for the resource (e.g., "Customer Support Agent", "Email Tool")
      Required for resources that users interact with directly

    - `profile_id: String`

      ID of the actor (user or service account) that created this resource

    - `workspace_id: String`

      Workspace this resource belongs to for organizational grouping (prefixed ULID)

    - `bundle_key: String`

      Optional bundle ownership key. When set, indicates the resource is
      managed by a configuration bundle identified by this key. Used by
      BulkWorkspaceResources.Apply to track which resources belong to which
      bundle for reconciliation / soft-delete on re-apply.

    - `external_id: String`

      External ID for the resource (e.g., a workflow ID from an external system)

    - `labels: Hash[Symbol, String]`

      Arbitrary key-value pairs for categorization and filtering
      Examples: {"environment": "production", "team": "platform", "version": "v2"}

  - `spec: MemoryLayerSpec`

    - `type: :MEMORY_LAYER_TYPE_UNSPECIFIED | :MEMORY_LAYER_TYPE_EPISODIC | :MEMORY_LAYER_TYPE_SKILLS`

      - `:MEMORY_LAYER_TYPE_UNSPECIFIED`

      - `:MEMORY_LAYER_TYPE_EPISODIC`

      - `:MEMORY_LAYER_TYPE_SKILLS`

    - `description: String`

      Human-readable description of the layer's purpose. Encouraged for
      user-created layers; system-managed layers may have a generated description.

    - `expires_at: Time`

      For layers with a finite lifetime (e.g., episodic), the time at which the
      layer becomes eligible for cleanup. Set by the system; unset for
      persistent layers.

    - `system_managed: bool`

      Server-set. True for layers managed by the system (e.g., episodic layers
      created automatically when an objective uses an episodic_key). System-managed
      layers cannot be assigned to objective stacks via the API and cannot be
      mutated by clients — their lifecycle is controlled entirely by the runtime.

  - `info: MemoryLayerInfo`

    - `created_by: Profile`

      A profile identifies a user or non-human principal (such as an API key)
      at the account level. Profiles are account-scoped and can be granted access
      to multiple workspaces.

      - `metadata: AccountResourceMetadata`

        AccountResourceMetadata is used to represent a resource that is associated to an account but not to a workspace.

        - `id: String`

          Unique identifier for the resource (prefixed ULID, e.g., "apikey_01HXK...")

        - `account_id: String`

          Account this resource belongs to for multi-tenant isolation (prefixed ULID)

        - `name: String`

          Human-readable name for the resource (e.g., "Customer Support Agent", "Email Tool")
          Required for resources that users interact with directly

        - `profile_id: String`

        - `external_id: String`

          External ID for the resource (e.g., a workflow ID from an external system)

        - `labels: Hash[Symbol, String]`

          Arbitrary key-value pairs for categorization and filtering
          Examples: {"environment": "production", "team": "platform", "version": "v2"}

      - `spec: ProfileSpec`

        Configuration for a profile.

        - `type: :PROFILE_TYPE_UNSPECIFIED | :PROFILE_TYPE_USER | :PROFILE_TYPE_API_KEY | :PROFILE_TYPE_SYSTEM`

          Whether this profile represents a human user, an API key, or a system
          principal.

          - `:PROFILE_TYPE_UNSPECIFIED`

          - `:PROFILE_TYPE_USER`

          - `:PROFILE_TYPE_API_KEY`

          - `:PROFILE_TYPE_SYSTEM`

        - `email: String`

          Email address of the profile. Required and unique within an account for
          user profiles.

        - `name: String`

          Display name (e.g., "Bobby Tables").

    - `entry_count: Integer`

      Number of entries currently in this layer.

    - `last_used_at: Time`

      Timestamp of the most recent objective that resolved against this layer.
      Useful for surfacing unused layers in the dashboard.

### Example

```ruby
require "cadenya"

cadenya = Cadenya::Client.new(api_key: "My API Key")

memory_layer = cadenya.memory_layers.update("id", workspace_id: "workspaceId")

puts(memory_layer)
```

#### Response

```json
{
  "metadata": {
    "id": "id",
    "accountId": "accountId",
    "createdAt": "2019-12-27T18:11:19.117Z",
    "name": "name",
    "profileId": "profileId",
    "workspaceId": "workspaceId",
    "bundleKey": "bundleKey",
    "externalId": "externalId",
    "labels": {
      "foo": "string"
    }
  },
  "spec": {
    "type": "MEMORY_LAYER_TYPE_UNSPECIFIED",
    "description": "description",
    "expiresAt": "2019-12-27T18:11:19.117Z",
    "systemManaged": true
  },
  "info": {
    "createdBy": {
      "metadata": {
        "id": "id",
        "accountId": "accountId",
        "name": "name",
        "profileId": "profileId",
        "externalId": "externalId",
        "labels": {
          "foo": "string"
        }
      },
      "spec": {
        "type": "PROFILE_TYPE_UNSPECIFIED",
        "email": "email",
        "name": "name"
      }
    },
    "entryCount": 0,
    "lastUsedAt": "2019-12-27T18:11:19.117Z"
  }
}
```