> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.twelvelabs.io/v1.3/api-reference/knowledge-store-items/item-collections/create/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.twelvelabs.io/_mcp/server.

# Create an item collection

POST https://api.twelvelabs.io/v1.3/knowledge-stores/{knowledge_store_id}/item-collections
Content-Type: application/json

Creates an item collection in the specified knowledge store. An item collection is a named collection of items. Use item collections to organize and reference subsets of items together.


Reference: https://docs.twelvelabs.io/api-reference/knowledge-store-items/item-collections/create

## Authentication

- `x-api-key` header (required) — Your API key. You can find your API key on the API Keys page.

## Request

### Path parameters

- `knowledge_store_id` (string, required) — The unique identifier of the knowledge store.

### Body (application/json)

This endpoint expects an object.

- `name` (string, required) — The name of the item collection. Must be unique within the knowledge store.
- `description` (string, optional) — An optional description of the item collection.
- `metadata` (map from string to KnowledgeStoreMetadataValue, optional) — Custom metadata for the item collection, as user-defined key-value pairs. Up to 10 pairs, keys up to 128 characters, string values up to 2048 characters. Keys are strings; values can be a string, a number, a boolean, or an array of strings. A nested object, an array containing anything other than strings, and a null value are rejected. An integer must fit in 53 bits (-9007199254740991 to 9007199254740991). Send a wider integer, or an identifier that must be preserved verbatim, as a string.

## Response

### 201

The item collection has been successfully created.

- `_id` (string, optional) — The unique identifier of the item collection.
- `knowledge_store_id` (string, optional) — The unique identifier of the knowledge store this collection belongs to.
- `name` (string, optional) — The name of the item collection.
- `description` (string, optional) — The description of the item collection.
- `metadata` (map from string to KnowledgeStoreMetadataValue, optional) — Custom metadata for the item collection. Keys are strings; each value is a string, a number, a boolean, or an array of strings.
- `member_count` (integer, optional) — The number of items in the collection.
- `created_at` (string, optional) — The date and time when the item collection was created, in the RFC 3339 format.
- `updated_at` (string, optional) — The date and time when the item collection was last updated, in the RFC 3339 format.

## Errors

### 400 Bad Request Error

The request has failed.

- `code` (string, optional) — A string representing the code associated with the error. See the [Error codes](/v1.3/api-reference/error-codes) page for details.
- `message` (string, optional) — A human-readable string describing the error, intended to be suitable for display in a user interface.

## Types

### KnowledgeStoreMetadataValue

A single custom-metadata value: a string, a number, a boolean, or an array of strings. The value keeps the JSON type sent; a nested object, an array containing anything other than strings, and a null value are rejected. An integer must fit in 53 bits (-9007199254740991 to 9007199254740991). A wider integer, or an identifier that must be preserved verbatim, must be sent as a string.

## Examples

**Request**

```json
{
  "name": "Q1 highlights"
}
```

**Response**

```json
{
  "_id": "ksic_069e9870-3c4d-7abc-9012-3456789abcde",
  "knowledge_store_id": "ks_069e9869-1ea3-7481-8000-dae72bf6be6e",
  "name": "Q1 highlights",
  "description": "Highlight clips selected for the Q1 review",
  "metadata": {},
  "member_count": 12,
  "created_at": "2024-01-15T09:30:00Z",
  "updated_at": "2024-01-15T09:30:00Z"
}
```

**SDK Code**

```python
import requests

url = "https://api.twelvelabs.io/v1.3/knowledge-stores/ks_069e9869-1ea3-7481-8000-dae72bf6be6e/item-collections"

payload = { "name": "Q1 highlights" }
headers = {
    "x-api-key": "<apiKey>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'https://api.twelvelabs.io/v1.3/knowledge-stores/ks_069e9869-1ea3-7481-8000-dae72bf6be6e/item-collections';
const options = {
  method: 'POST',
  headers: {'x-api-key': '<apiKey>', 'Content-Type': 'application/json'},
  body: '{"name":"Q1 highlights"}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.twelvelabs.io/v1.3/knowledge-stores/ks_069e9869-1ea3-7481-8000-dae72bf6be6e/item-collections"

	payload := strings.NewReader("{\n  \"name\": \"Q1 highlights\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("x-api-key", "<apiKey>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.twelvelabs.io/v1.3/knowledge-stores/ks_069e9869-1ea3-7481-8000-dae72bf6be6e/item-collections")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<apiKey>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"Q1 highlights\"\n}"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.twelvelabs.io/v1.3/knowledge-stores/ks_069e9869-1ea3-7481-8000-dae72bf6be6e/item-collections")
  .header("x-api-key", "<apiKey>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"Q1 highlights\"\n}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.twelvelabs.io/v1.3/knowledge-stores/ks_069e9869-1ea3-7481-8000-dae72bf6be6e/item-collections', [
  'body' => '{
  "name": "Q1 highlights"
}',
  'headers' => [
    'Content-Type' => 'application/json',
    'x-api-key' => '<apiKey>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.twelvelabs.io/v1.3/knowledge-stores/ks_069e9869-1ea3-7481-8000-dae72bf6be6e/item-collections");
var request = new RestRequest(Method.POST);
request.AddHeader("x-api-key", "<apiKey>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"name\": \"Q1 highlights\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "x-api-key": "<apiKey>",
  "Content-Type": "application/json"
]
let parameters = ["name": "Q1 highlights"] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.twelvelabs.io/v1.3/knowledge-stores/ks_069e9869-1ea3-7481-8000-dae72bf6be6e/item-collections")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```