---
title: Telemetry
description: What the CLI collects, why, and how to disable it.
---
`@c15t/cli` collects anonymous usage data to help us prioritise features and find rough edges in workflows. It is fully optional — the CLI works the same with telemetry disabled.

## What we collect

* Which command was run (e.g. `setup`, `codemods`, `self-host migrate`).
* Whether the run succeeded or failed.
* Which framework was detected (React, Next.js, vanilla).
* The CLI version and Node.js version.
* A randomly generated, anonymous machine ID (rotates if you reset config).

## What we do **not** collect

* Source code, file contents, or file paths.
* Environment variables or secrets.
* Configuration values from your `c15t.config`.
* Personally identifiable information.

## How to disable

Per-run:

```bash
pnpm dlx @c15t/cli setup --no-telemetry
```

Permanently for your user:

```bash
export C15T_TELEMETRY_DISABLED=1
```

Add the export to your shell profile (`.zshrc`, `.bashrc`, etc.) to make it persistent.

## Source

The telemetry implementation is open source — see [`packages/cli/src/utils/telemetry.ts`](https://github.com/c15t/c15t/blob/main/packages/cli/src/utils/telemetry.ts) for the exact event names and payloads.