> ## Documentation Index
> Fetch the complete documentation index at: https://docs.shinzo.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Update File

> Replace the contents of an existing file in an agent's workspace.

## Authentication

Requires JWT token or Platform API key.

<ParamField path="agentId" type="string" required>Agent UUID</ParamField>
<ParamField path="path" type="string" required>File path within the agent workspace (wildcard segment)</ParamField>
<ParamField body="content" type="string" required>New file content</ParamField>
<ParamField body="encoding" type="string" default="utf-8">Content encoding (`utf-8` or `base64`)</ParamField>

## Example Request

```bash theme={null}
curl -X PUT "https://api.app.shinzo.ai/v1/agent/agt_abc123/filesystem/files/workspace/config.json" \
  -H "Authorization: Bearer <jwt_token>" \
  -H "Content-Type: application/json" \
  -d '{
    "content": "{\"debug\": false, \"log_level\": \"warn\"}",
    "encoding": "utf-8"
  }'
```

## Response

```json theme={null}
{
  "path": "/workspace/config.json",
  "size": 40,
  "updated_at": "2025-01-20T12:30:00Z"
}
```

## Response Fields

| Field        | Type   | Description                       |
| ------------ | ------ | --------------------------------- |
| `path`       | string | Absolute path of the updated file |
| `size`       | number | New file size in bytes            |
| `updated_at` | string | Update timestamp (ISO 8601)       |

## Status Codes

| Code  | Description               |
| ----- | ------------------------- |
| `200` | File updated successfully |
| `400` | Invalid request body      |
| `401` | Invalid authentication    |
| `403` | Access denied             |
| `404` | Agent or file not found   |