> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.basement.chat/pt-br/api-reference/api-do-gateway/files/write/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.basement.chat/_mcp/server.

# Upload a file or a new version of it

POST https://mcp.basement.chat/v1/tools/write_file
Content-Type: application/json

Upload a file of up to 5 MB. Give text in content or binary data in contentBase64 (one of them is required). A new file goes to the General folder unless you give a folderId. To upload a new version of a file, pass its fileId. Basement then replaces only the content and ignores name, kind, tags and folderId. To change only a part of a text file, use edit_file. Requires write access.

Reference: https://docs.basement.chat/pt-br/api-reference/api-do-gateway/files/write

## Authentication

- `Authorization` header (bearer token, required) — A Basement key (bsmt_...), from Agents, Connect in the app.

## Request

### Body (application/json)

This endpoint expects an object.

- `name` (string, required) — File name with extension
- `content` (string, optional) — Text content
- `contentBase64` (string, optional) — Binary content, base64-encoded
- `mimeType` (string, optional) — MIME type (default text/plain for content, application/octet-stream for contentBase64)
- `kind` (enum, optional) — File kind (default asset)
  - Allowed values: `asset`, `logo`, `pdf`, `mcp_file`, `other`
- `tags` (list of string, optional) — Optional tags
- `fileId` (string, optional) — Optional existing file ID to update
- `folderId` (string, optional) — Optional folder for a new file, from list_folders. You must have write access to it

## Response

### 200

The tool's answer.

- `id` (string, optional) — The new file's ID (when a file was created)
- `versionCount` (integer, optional) — The file's new version (when a file was replaced)

## Errors

### 400 Bad Request Error

The arguments are not valid, or the tool refused them.

- `error` (ErrorResponseError, required)

### 401 Unauthorized Error

The API key is missing, wrong, revoked or expired.

- `error` (ErrorResponseError, required)

### 403 Forbidden Error

The key's access level does not allow this call.

- `error` (ErrorResponseError, required)

### 429 Too Many Requests Error

Too many calls in a minute. Wait and try again.

- `error` (ErrorResponseError, required)

### 500 Internal Server Error

Basement failed to complete the call.

- `error` (ErrorResponseError, required)

## Types

### ErrorResponseError

- `code` (string, required) — unauthorized, forbidden, invalid_request, not_found, rate_limited, service_error or internal_error
- `message` (string, required) — What went wrong, in English

## Examples

**Request**

```json
{
  "name": "string"
}
```

**Response**

```json
{
  "id": "string",
  "versionCount": 1
}
```

**SDK Code**

```python
import requests

url = "https://mcp.basement.chat/v1/tools/write_file"

payload = { "name": "string" }
headers = {
    "Authorization": "Bearer <apiKey>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript
const url = 'https://mcp.basement.chat/v1/tools/write_file';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <apiKey>', 'Content-Type': 'application/json'},
  body: '{"name":"string"}'
};

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://mcp.basement.chat/v1/tools/write_file"

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

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

	req.Header.Add("Authorization", "Bearer <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://mcp.basement.chat/v1/tools/write_file")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <apiKey>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"string\"\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://mcp.basement.chat/v1/tools/write_file")
  .header("Authorization", "Bearer <apiKey>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"string\"\n}")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://mcp.basement.chat/v1/tools/write_file', [
  'body' => '{
  "name": "string"
}',
  'headers' => [
    'Authorization' => 'Bearer <apiKey>',
    'Content-Type' => 'application/json',
  ],
]);

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

```csharp
using RestSharp;

var client = new RestClient("https://mcp.basement.chat/v1/tools/write_file");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <apiKey>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"name\": \"string\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <apiKey>",
  "Content-Type": "application/json"
]
let parameters = ["name": "string"] as [String : Any]

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

let request = NSMutableURLRequest(url: NSURL(string: "https://mcp.basement.chat/v1/tools/write_file")! 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()
```