## Update a memory layer

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

Updates a memory layer in the workspace

### Path Parameters

- `id: string`

### Body Parameters

- `metadata: optional 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")

  - `externalId: optional string`

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

  - `labels: optional map[string]`

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

- `spec: optional MemoryLayerSpec`

  - `type: "MEMORY_LAYER_TYPE_UNSPECIFIED" or "MEMORY_LAYER_TYPE_EPISODIC" or "MEMORY_LAYER_TYPE_SKILLS"`

    - `"MEMORY_LAYER_TYPE_UNSPECIFIED"`

    - `"MEMORY_LAYER_TYPE_EPISODIC"`

    - `"MEMORY_LAYER_TYPE_SKILLS"`

  - `description: optional string`

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

  - `expiresAt: optional string`

    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.

  - `systemManaged: optional boolean`

    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.

- `updateMask: optional string`

### Returns

- `MemoryLayer = object { metadata, spec, info }`

  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.

  Memory stacks are LIFO: when an objective resolves a key, layers are walked
  from the top of the stack downward, and the first matching entry wins.

  - `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...")

    - `accountId: string`

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

    - `createdAt: string`

      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

    - `profileId: string`

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

    - `workspaceId: string`

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

    - `externalId: optional string`

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

    - `labels: optional map[string]`

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

  - `spec: MemoryLayerSpec`

    - `type: "MEMORY_LAYER_TYPE_UNSPECIFIED" or "MEMORY_LAYER_TYPE_EPISODIC" or "MEMORY_LAYER_TYPE_SKILLS"`

      - `"MEMORY_LAYER_TYPE_UNSPECIFIED"`

      - `"MEMORY_LAYER_TYPE_EPISODIC"`

      - `"MEMORY_LAYER_TYPE_SKILLS"`

    - `description: optional string`

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

    - `expiresAt: optional string`

      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.

    - `systemManaged: optional boolean`

      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: optional MemoryLayerInfo`

    - `createdBy: optional Profile`

      Profile represents a human user at the account level.
      Profiles are account-scoped resources that can be associated with multiple workspaces
      through the Actor model. Authentication for profiles is handled via SSO/OAuth (WorkOS).

      - `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...")

        - `accountId: 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

        - `profileId: string`

        - `externalId: optional string`

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

        - `labels: optional map[string]`

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

      - `spec: ProfileSpec`

        ProfileSpec contains the profile-specific fields

        - `type: "PROFILE_TYPE_USER" or "PROFILE_TYPE_API_KEY" or "PROFILE_TYPE_SYSTEM"`

          Type is the type of profile. User's are humans, API keys are computers. You know the deal.

          - `"PROFILE_TYPE_USER"`

          - `"PROFILE_TYPE_API_KEY"`

          - `"PROFILE_TYPE_SYSTEM"`

        - `email: optional string`

          Email address of the user (required, unique per account)

        - `name: optional string`

          Display name for the user (e.g., "Bobby Tables")

    - `entryCount: optional number`

      Number of entries currently in this layer.

    - `lastUsedAt: optional string`

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

### Example

```http
curl https://api.cadenya.com/v1/memory_layers/$ID \
    -X PATCH \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer $CADENYA_API_KEY" \
    -d '{}'
```

#### Response

```json
{
  "metadata": {
    "id": "id",
    "accountId": "accountId",
    "createdAt": "2019-12-27T18:11:19.117Z",
    "name": "name",
    "profileId": "profileId",
    "workspaceId": "workspaceId",
    "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_USER",
        "email": "email",
        "name": "name"
      }
    },
    "entryCount": 0,
    "lastUsedAt": "2019-12-27T18:11:19.117Z"
  }
}
```