<!-- Extension API v0 — pre-1.0. Interfaces may change without notice until P2 seals the custom-code format. First-party extensions track HEAD. -->

# `catalog.collection.create`

Create a collection (handle derived from title when omitted).

- **scope**: `catalog:write`
- **storefront-visible** (bumps the catalog generation): yes
- **destructive**: no

## Payload

| field | type | required | notes |
|---|---|---|---|
| `title` | string (≤120 chars) | yes |  |
| `handle` | string (/^[a-z0-9](?:[a-z0-9-]{0,62}[a-z0-9])?$/, ≤64 chars) | no |  |
| `descriptionMd` | string (≤20000 chars) | no |  |
| `imageMediaId` | string (/^med_[a-zA-Z0-9]{1,32}$/) | no |  |
| `imageAlt` | string (≤200 chars) | no |  |

### JSON Schema

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "title": {
      "type": "string",
      "minLength": 1,
      "maxLength": 120
    },
    "handle": {
      "type": "string",
      "maxLength": 64,
      "pattern": "^[a-z0-9](?:[a-z0-9-]{0,62}[a-z0-9])?$"
    },
    "descriptionMd": {
      "type": "string",
      "maxLength": 20000
    },
    "imageMediaId": {
      "type": "string",
      "pattern": "^med_[a-zA-Z0-9]{1,32}$"
    },
    "imageAlt": {
      "type": "string",
      "maxLength": 200
    }
  },
  "required": [
    "title"
  ],
  "additionalProperties": false
}
```