> For the complete documentation index, see [llms.txt](https://docs.testvibe.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.testvibe.com/testvibe-api/api-reference/files/write_file.md).

# write\_file

Create or overwrite a project file. The write takes effect on the **next** run or generation.

{% hint style="warning" %}
**The allowlist is strict.** Only paths under `Features/` or `Configurations/` are writable, no `..` segments, content ≤ 256 KB. Generated specs and template scaffolding are owned by the pipeline and can't be written. See [Files & configurations](/testvibe-api/core-concepts/files-and-configurations.md).
{% endhint %}

## Request

```
PUT /api/v1/ops/projects/{project}/files/content
```

| Parameter | In   | Type   | Required | Description                                            |
| --------- | ---- | ------ | -------- | ------------------------------------------------------ |
| `project` | path | string | yes      | The project's public id.                               |
| `path`    | body | string | yes      | The file path, e.g. `Configurations/Mobile.config.js`. |
| `content` | body | string | yes      | The full file content (writes are whole-file).         |

{% tabs %}
{% tab title="cURL" %}

```bash
curl -X PUT -H "Authorization: Bearer $TESTVIBE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"path": "Configurations/Mobile.config.js", "content": "module.exports = { … };"}' \
  "$TESTVIBE_SERVER/api/v1/ops/projects/$PROJECT/files/content"
```

{% endtab %}

{% tab title="CLI" %}

```bash
testvibe files put Configurations/Mobile.config.js --file ./mobile.config.js
```

{% endtab %}

{% tab title="MCP" %}
Tool **`write_file`** — `{ "path": "Configurations/Mobile.config.js", "content": "…" }`.
{% endtab %}
{% endtabs %}

## Response

```json
{ "ok": true }
```

## Errors

| HTTP                  | When                                                                                        |
| --------------------- | ------------------------------------------------------------------------------------------- |
| `400 invalid_request` | Path missing, outside `Features/`/`Configurations/`, contains `..`, or content over 256 KB. |
| `404 not_found`       | No such project in this workspace.                                                          |


---

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```
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