> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.simplified.com/api-reference/platform/brand-context/create-context-document/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.simplified.com/_mcp/server.

# API · Context · Create a context document

POST https://api.simplified.com/api/v1/brandkit/{brand_id}/context-documents
Content-Type: application/json

Create a new context document and link it to the brand kit.

**Two creation modes:**
1. **Link existing:** Provide `document_id` to link an existing KnowledgeDoc.
2. **Inline creation:** Provide `doc_type` and `name` (plus optional `description`,
   `data`, `content`) to create a new KnowledgeDoc and link it automatically.

**Singleton constraint:** For predefined types (brand_voice, icps, usps, etc.),
only one document per type per brandkit is allowed. Attempting to create a
duplicate will return a 400 error.

The `canonical_key` is auto-set from `doc_type` if it matches a predefined type.


Reference: https://docs.simplified.com/api-reference/platform/brand-context/create-context-document

## Authentication

- `Authorization` header (required) (prefixed with ` Api-Key   `) — Header authentication of the form `Api-Key  <token>`
- `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer <token>`, where token is your auth token.

## Request

### Path parameters

- `brand_id` (string, required) — Brand kit UUID

### Body (application/json)

This endpoint expects a ContextDocumentCreateRequest.

- `document_id` (string, optional) — Link an existing KnowledgeDoc by ID (mutually exclusive with inline fields)
- `doc_type` (string, optional) — Document type key for inline creation (e.g. brand_voice, style_guide)
- `name` (string, optional) — Document name for inline creation
- `description` (string, optional) — Document description (optional, defaults to empty)
- `data` (map from string to any, optional) — Structured JSON data (optional, defaults to empty object)
- `content` (string, optional) — Markdown content (optional, defaults to empty)

## Response

### 201

Context document created

- `any`

## Errors

### 400 Bad Request Error

Validation error. Common causes: - Neither `document_id` nor `doc_type` provided - Singleton violation (predefined type already exists for this brandkit)

- `any`

### 401 Unauthorized Error

Unauthorized

- `any`

### 404 Not Found Error

Brand kit not found

- `any`

## Examples

### Create new document inline

**Request**

```json
{
  "doc_type": "brand_voice",
  "name": "Brand Voice & Messaging",
  "data": {
    "formality": 60,
    "tone": "professional"
  },
  "content": "# Brand Voice\n\nOur brand speaks with confidence and warmth..."
}
```

**SDK Code**

```python Create new document inline
import requests

url = "https://api.simplified.com/api/v1/brandkit/brand_id/context-documents"

payload = {
    "doc_type": "brand_voice",
    "name": "Brand Voice & Messaging",
    "data": {
        "formality": 60,
        "tone": "professional"
    },
    "content": "# Brand Voice

Our brand speaks with confidence and warmth..."
}
headers = {
    "Authorization": "Api-Key  <apiKey>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript Create new document inline
const url = 'https://api.simplified.com/api/v1/brandkit/brand_id/context-documents';
const options = {
  method: 'POST',
  headers: {Authorization: 'Api-Key  <apiKey>', 'Content-Type': 'application/json'},
  body: '{"doc_type":"brand_voice","name":"Brand Voice & Messaging","data":{"formality":60,"tone":"professional"},"content":"# Brand Voice\n\nOur brand speaks with confidence and warmth..."}'
};

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

```go Create new document inline
package main

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

func main() {

	url := "https://api.simplified.com/api/v1/brandkit/brand_id/context-documents"

	payload := strings.NewReader("{\n  \"doc_type\": \"brand_voice\",\n  \"name\": \"Brand Voice & Messaging\",\n  \"data\": {\n    \"formality\": 60,\n    \"tone\": \"professional\"\n  },\n  \"content\": \"# Brand Voice\\n\\nOur brand speaks with confidence and warmth...\"\n}")

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

	req.Header.Add("Authorization", "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 Create new document inline
require 'uri'
require 'net/http'

url = URI("https://api.simplified.com/api/v1/brandkit/brand_id/context-documents")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Api-Key  <apiKey>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"doc_type\": \"brand_voice\",\n  \"name\": \"Brand Voice & Messaging\",\n  \"data\": {\n    \"formality\": 60,\n    \"tone\": \"professional\"\n  },\n  \"content\": \"# Brand Voice\\n\\nOur brand speaks with confidence and warmth...\"\n}"

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

```java Create new document inline
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.simplified.com/api/v1/brandkit/brand_id/context-documents")
  .header("Authorization", "Api-Key  <apiKey>")
  .header("Content-Type", "application/json")
  .body("{\n  \"doc_type\": \"brand_voice\",\n  \"name\": \"Brand Voice & Messaging\",\n  \"data\": {\n    \"formality\": 60,\n    \"tone\": \"professional\"\n  },\n  \"content\": \"# Brand Voice\\n\\nOur brand speaks with confidence and warmth...\"\n}")
  .asString();
```

```php Create new document inline
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.simplified.com/api/v1/brandkit/brand_id/context-documents', [
  'body' => '{
  "doc_type": "brand_voice",
  "name": "Brand Voice & Messaging",
  "data": {
    "formality": 60,
    "tone": "professional"
  },
  "content": "# Brand Voice\\n\\nOur brand speaks with confidence and warmth..."
}',
  'headers' => [
    'Authorization' => 'Api-Key  <apiKey>',
    'Content-Type' => 'application/json',
  ],
]);

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

```csharp Create new document inline
using RestSharp;

var client = new RestClient("https://api.simplified.com/api/v1/brandkit/brand_id/context-documents");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Api-Key  <apiKey>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"doc_type\": \"brand_voice\",\n  \"name\": \"Brand Voice & Messaging\",\n  \"data\": {\n    \"formality\": 60,\n    \"tone\": \"professional\"\n  },\n  \"content\": \"# Brand Voice\\n\\nOur brand speaks with confidence and warmth...\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift Create new document inline
import Foundation

let headers = [
  "Authorization": "Api-Key  <apiKey>",
  "Content-Type": "application/json"
]
let parameters = [
  "doc_type": "brand_voice",
  "name": "Brand Voice & Messaging",
  "data": [
    "formality": 60,
    "tone": "professional"
  ],
  "content": "# Brand Voice

Our brand speaks with confidence and warmth..."
] as [String : Any]

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

let request = NSMutableURLRequest(url: NSURL(string: "https://api.simplified.com/api/v1/brandkit/brand_id/context-documents")! 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()
```

### Link an existing KnowledgeDoc

**Request**

```json
{
  "document_id": "d1e2f3a4-b5c6-7890-abcd-000000000001"
}
```

**SDK Code**

```python Link an existing KnowledgeDoc
import requests

url = "https://api.simplified.com/api/v1/brandkit/brand_id/context-documents"

payload = { "document_id": "d1e2f3a4-b5c6-7890-abcd-000000000001" }
headers = {
    "Authorization": "Api-Key  <apiKey>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript Link an existing KnowledgeDoc
const url = 'https://api.simplified.com/api/v1/brandkit/brand_id/context-documents';
const options = {
  method: 'POST',
  headers: {Authorization: 'Api-Key  <apiKey>', 'Content-Type': 'application/json'},
  body: '{"document_id":"d1e2f3a4-b5c6-7890-abcd-000000000001"}'
};

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

```go Link an existing KnowledgeDoc
package main

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

func main() {

	url := "https://api.simplified.com/api/v1/brandkit/brand_id/context-documents"

	payload := strings.NewReader("{\n  \"document_id\": \"d1e2f3a4-b5c6-7890-abcd-000000000001\"\n}")

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

	req.Header.Add("Authorization", "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 Link an existing KnowledgeDoc
require 'uri'
require 'net/http'

url = URI("https://api.simplified.com/api/v1/brandkit/brand_id/context-documents")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Api-Key  <apiKey>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"document_id\": \"d1e2f3a4-b5c6-7890-abcd-000000000001\"\n}"

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

```java Link an existing KnowledgeDoc
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.simplified.com/api/v1/brandkit/brand_id/context-documents")
  .header("Authorization", "Api-Key  <apiKey>")
  .header("Content-Type", "application/json")
  .body("{\n  \"document_id\": \"d1e2f3a4-b5c6-7890-abcd-000000000001\"\n}")
  .asString();
```

```php Link an existing KnowledgeDoc
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.simplified.com/api/v1/brandkit/brand_id/context-documents', [
  'body' => '{
  "document_id": "d1e2f3a4-b5c6-7890-abcd-000000000001"
}',
  'headers' => [
    'Authorization' => 'Api-Key  <apiKey>',
    'Content-Type' => 'application/json',
  ],
]);

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

```csharp Link an existing KnowledgeDoc
using RestSharp;

var client = new RestClient("https://api.simplified.com/api/v1/brandkit/brand_id/context-documents");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Api-Key  <apiKey>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"document_id\": \"d1e2f3a4-b5c6-7890-abcd-000000000001\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift Link an existing KnowledgeDoc
import Foundation

let headers = [
  "Authorization": "Api-Key  <apiKey>",
  "Content-Type": "application/json"
]
let parameters = ["document_id": "d1e2f3a4-b5c6-7890-abcd-000000000001"] as [String : Any]

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

let request = NSMutableURLRequest(url: NSURL(string: "https://api.simplified.com/api/v1/brandkit/brand_id/context-documents")! 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()
```