# List surfaces across catalogs

`GET /platform/v1/surfaces`

List surfaces of every catalog the caller may see, narrowed by organization and / or tag. To list one catalog's surfaces use `GET /platform/v1/catalogs/{catalog_id}/surfaces`. Results are ordered by catalog_id, then id.

## Request example

```bash
curl --request GET \
  --url 'https://api.eu1.luigisbox.ai/platform/v1/surfaces?organization_id=lbo_a1b2c3&tag_id=lbt_a1b2c3&page=1&size=20' \
  --header 'Authorization: Bearer <access_token>'
```

## Query Parameters

| Name | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `organization_id` | `anyOf(string, null)` | No | Restrict to surfaces of this organization's catalogs. | — |
| `tag_id` | `anyOf(string, null)` | No | Restrict to members of this surface-dimension tag. Every tagged surface response carries the `lbt_` id it accepts under `tags[].id`. A tag that does not exist, belongs to another organization, or groups another dimension simply matches nothing. | — |
| `page` | `integer` | No | 1-based page number. | >= 1 |
| `size` | `integer` | No | Number of items per page. | >= 1; <= 100 |

## Responses

| Status | Description | Content |
|---|---|---|
| `200` | Successful Response | application/json: object |
| `401` | Missing or invalid credentials | application/json: object |
| `403` | Authenticated but not permitted | application/json: object |
| `422` | Request validation failed | application/json: object |

### 200

Successful Response

#### application/json

Schema: `object`

##### Attributes

| Attribute | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `items` | `Array<object>` | Yes | The items on this page. | — |
| `items[].catalog_id` | `string` | Yes | Catalog Id | — |
| `items[].created_at` | `string` | Yes | Created At | format: date-time |
| `items[].default_version` | `anyOf(integer, null)` | Yes | Default Version | — |
| `items[].id` | `string` | Yes | Id | — |
| `items[].input_type` | `anyOf(string, null)` | Yes | Catalog object type of the anchor objects this surface is queried with — what a recommender request names in `anchor_ids`. Required for `recommender` surfaces and rejected for every other kind, which take no anchor. | — |
| `items[].intent` | `string` | Yes | The kind of discovery this Surface performs — it fixes which Discovery API endpoint serves the Surface and what input a request must supply (`search` a query, `recommender` anchor objects, `collection` a scope). It is the contract, not the algorithm: a `search` Surface may retrieve lexically, semantically or both. Immutable — it is the middle slot of the surface id `lbs_<intent>_<slug>`, so changing it means a new Surface. | allowed values: search, recommender, collection |
| `items[].output_types` | `Array<string>` | Yes | Catalog object types this surface may answer with. Non-empty; duplicates collapse and input order is preserved. Acts as an allowlist: a request asking for a type absent from this list is rejected rather than answered with fewer results. It is a property of the surface, not of its kind — a recommender declares whatever it recommends, so a category recommender carries `category`. | — |
| `items[].slug` | `string` | Yes | Slug | — |
| `items[].tags` | `Array<object>` | Yes | The surface-dimension tags this surface belongs to, ordered by name, each carrying both its id and its name — the `id` is what the `tag_id` filter takes, the `name` is what a person reads, and neither needs a further request. Read-only here: membership is changed through `POST /platform/v1/tags`, or `PATCH /platform/v1/tags/{tag_id}` with `add_members` / `remove_members`, which carry `{catalog_id, surface_id}` pairs. A surface belongs to at most 20 tags. | — |
| `items[].tags[].id` | `string` | Yes | The tag's id — what `tag_id` filters and the tag writes take. | — |
| `items[].tags[].name` | `string` | Yes | Tag name as `namespace:value`, lowercased on write (`intent:SEARCH` is stored as `intent:search`). The `intent`, `language` and `recommender` namespaces are platform-managed: writing one requires `platform:reserved-tags:write` and deleting one requires `platform:reserved-tags:delete`. | <= 256 characters; /^[a-z][a-z0-9_-]{0,63}:[^\s:]{1,191}$/ |
| `items[].updated_at` | `string` | Yes | Updated At | format: date-time |
| `page` | `integer` | Yes | 1-based page number. | — |
| `size` | `integer` | Yes | Number of items per page. | — |
| `total` | `integer` | Yes | Total number of items across all pages. | — |

##### Response example

```json
{
  "items": [
    {
      "catalog_id": "example",
      "created_at": "2026-04-15T12:00:00Z",
      "default_version": 1,
      "id": "example",
      "input_type": "example",
      "intent": "search",
      "output_types": [
        "example"
      ],
      "slug": "example",
      "tags": [
        {
          "id": "example",
          "name": "example"
        }
      ],
      "updated_at": "2026-04-15T12:00:00Z"
    }
  ],
  "page": 1,
  "size": 1,
  "total": 1
}
```

### 401

Missing or invalid credentials

#### application/json

Schema: `object`

##### Attributes

| Attribute | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `exception_details` | `object` | No | Machine-readable error context; empty object when there is nothing to add. | — |
| `exception_details.error_code` | `string` | No | Stable machine code naming why a well-formed request was refused: snake_case, prefixed by its domain — e.g. `filter_unknown_field` or `cursor_mismatch`. Safe to branch on; `reason` is not. Absent when the status code says all there is to say. | — |
| `exception_details.validation_errors` | `Array<object>` | No | Every field-level problem found in the request, when validation is what failed. Absent when the rejection is not about a specific value. | — |
| `exception_details.validation_errors[].loc` | `Array<anyOf(string, integer)>` | Yes | Path to the offending value from the request root, e.g. `["body", "filters", 0, "operator"]`. | — |
| `exception_details.validation_errors[].msg` | `string` | Yes | What is wrong with the value at `loc`. | — |
| `exception_details.validation_errors[].type` | `string` | Yes | Stable machine code for the problem, e.g. `missing` or `string_too_short`. | — |
| `exception_details.*` | `any` | No | Additional property. | — |
| `reason` | `string` | Yes | Human-readable, actionable error message. | — |
| `request_id` | `anyOf(string, null)` | No | Request correlation ID (matches the X-Request-Id response header). | — |

##### Response example

```json
{
  "exception_details": {
    "error_code": "example",
    "validation_errors": [
      {
        "loc": [
          "example"
        ],
        "msg": "example",
        "type": "example"
      }
    ]
  },
  "reason": "example",
  "request_id": "example"
}
```

### 403

Authenticated but not permitted

#### application/json

Schema: `object`

##### Attributes

| Attribute | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `exception_details` | `object` | No | Machine-readable error context; empty object when there is nothing to add. | — |
| `exception_details.error_code` | `string` | No | Stable machine code naming why a well-formed request was refused: snake_case, prefixed by its domain — e.g. `filter_unknown_field` or `cursor_mismatch`. Safe to branch on; `reason` is not. Absent when the status code says all there is to say. | — |
| `exception_details.validation_errors` | `Array<object>` | No | Every field-level problem found in the request, when validation is what failed. Absent when the rejection is not about a specific value. | — |
| `exception_details.validation_errors[].loc` | `Array<anyOf(string, integer)>` | Yes | Path to the offending value from the request root, e.g. `["body", "filters", 0, "operator"]`. | — |
| `exception_details.validation_errors[].msg` | `string` | Yes | What is wrong with the value at `loc`. | — |
| `exception_details.validation_errors[].type` | `string` | Yes | Stable machine code for the problem, e.g. `missing` or `string_too_short`. | — |
| `exception_details.*` | `any` | No | Additional property. | — |
| `reason` | `string` | Yes | Human-readable, actionable error message. | — |
| `request_id` | `anyOf(string, null)` | No | Request correlation ID (matches the X-Request-Id response header). | — |

##### Response example

```json
{
  "exception_details": {
    "error_code": "example",
    "validation_errors": [
      {
        "loc": [
          "example"
        ],
        "msg": "example",
        "type": "example"
      }
    ]
  },
  "reason": "example",
  "request_id": "example"
}
```

### 422

Request validation failed

#### application/json

Schema: `object`

##### Attributes

| Attribute | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `exception_details` | `object` | No | Machine-readable error context; empty object when there is nothing to add. | — |
| `exception_details.error_code` | `string` | No | Stable machine code naming why a well-formed request was refused: snake_case, prefixed by its domain — e.g. `filter_unknown_field` or `cursor_mismatch`. Safe to branch on; `reason` is not. Absent when the status code says all there is to say. | — |
| `exception_details.validation_errors` | `Array<object>` | No | Every field-level problem found in the request, when validation is what failed. Absent when the rejection is not about a specific value. | — |
| `exception_details.validation_errors[].loc` | `Array<anyOf(string, integer)>` | Yes | Path to the offending value from the request root, e.g. `["body", "filters", 0, "operator"]`. | — |
| `exception_details.validation_errors[].msg` | `string` | Yes | What is wrong with the value at `loc`. | — |
| `exception_details.validation_errors[].type` | `string` | Yes | Stable machine code for the problem, e.g. `missing` or `string_too_short`. | — |
| `exception_details.*` | `any` | No | Additional property. | — |
| `reason` | `string` | Yes | Human-readable, actionable error message. | — |
| `request_id` | `anyOf(string, null)` | No | Request correlation ID (matches the X-Request-Id response header). | — |

##### Response example

```json
{
  "exception_details": {
    "error_code": "example",
    "validation_errors": [
      {
        "loc": [
          "example"
        ],
        "msg": "example",
        "type": "example"
      }
    ]
  },
  "reason": "example",
  "request_id": "example"
}
```