Privacy Policy

Last updated: May 2025

1. Overview

MCP Playground is a no-login developer tool. Our philosophy is simple: we collect and store as little data as technically possible. This policy explains exactly what happens with your data when you use the playground.

2. What We Do Not Collect

  • No accounts, no logins. You do not need to create an account or provide any identifying information to use the playground.
  • No personal data. We do not collect names, email addresses, passwords, or any personally identifiable information.
  • No API keys stored. Your AI provider API keys are sent with each request and never persisted on our servers.
  • No tracking. We do not use analytics cookies, tracking scripts, or third-party trackers on the playground.
  • No advertising. We do not serve ads or share data with advertising networks.

3. What We Do Store (Per-Session)

To make the playground work, we temporarily store the following in a per-session Durable Object instance on Cloudflare's edge:

  • Session identifier. A randomly generated string stored in your browser's localStorage to associate you with your Durable Object instance.
  • Chat conversation history. The messages you exchange with AI models are stored in SQLite within your DO instance so you can continue conversations across page refreshes.
  • MCP server connection state. URLs and connection metadata for MCP servers you connect to.
  • Scheduled tasks. If you use the scheduling feature, task descriptions and metadata are stored until the task executes.

This data is isolated per session. One user cannot access another user's conversations. Durable Object instances are ephemeral and may be evicted after periods of inactivity.

4. AI Provider Data

When you chat with AI models, your messages and tool call data are sent to your chosen AI provider (via Cloudflare AI Gateway). Each provider has its own privacy policy and data handling practices. We do not control how third-party AI providers use your data. Review the policies of your AI provider:

5. Cloudflare AI Gateway

All AI provider requests pass through Cloudflare AI Gateway, which may log request metadata (model, token count, duration, cache status) for operational purposes. Cloudflare AI Gateway does not log request bodies or API keys. See Cloudflare's Privacy Policy for details on their data handling.

6. MCP Server Connections

When you connect to an external MCP server, tool discovery requests and tool execution calls are routed through our infrastructure to the MCP server you specify. We do not log, store, or inspect the content of MCP tool calls beyond what is necessary for the playground's operation (displaying tool results in your chat). The MCP server you connect to may log or process your requests according to its own policies.

7. Cookies and Local Storage

We use localStorage (not cookies) to store your session identifier. This is technically required for the playground to function — it allows you to reconnect to the same Durable Object instance after a page refresh. No other data is stored in your browser. We do not use tracking cookies or third-party cookies.

8. Data Retention

Per-session data (conversations, MCP connections, scheduled tasks) is stored in Durable Object SQLite instances on Cloudflare's edge. This data is retained as long as the Durable Object instance is active. Instances may be evicted after extended periods of inactivity. There is no long-term archival or backup of session data.

9. Your Rights

Since we do not collect personal data or require accounts, there is no personal data to access, correct, or delete. If you have concerns about data associated with a specific session, you can clear it by removing the session ID from your browser's localStorage (use the “Clear Session” option in the playground) or by clearing your browser data.

10. Changes to This Policy

We may update this policy as the service evolves. Changes will be posted at this URL. We do not send notifications about policy changes since we have no way to contact you (no accounts, no email collection).

11. Contact

Questions or concerns about this privacy policy? Contact us at contact@mcpsplayground.com.