Zapier MCP tools return "not found" (404) errors

If Zapier MCP tools start returning 404 errors after working previously, the server URL stored by your AI client has likely expired. This issue only affects AI clients that save the server URL in their configuration.

Symptom

Your MCP tools stop working and return 404 (not found) errors when your AI client tries to use them.

Causes

The server URL stored in your AI client's configuration is no longer valid. The URL contains a secret key that can become invalid over time, particularly after long periods of inactivity or after a security event. Once the key is invalid, the saved URL can no longer authenticate tool calls.

How to fix it

If your AI client supports updating the server URL in its configuration, generate a new URL and replace the saved one:

1. Go to the Zapier MCP dashboard and select your server.
2. Select the Connect tab.
3. Click the Rotate token button to generate a new server URL. This is only available if your client supports it.
4. Update the URL in your AI client's configuration.
5. Restart your AI client.

Note

Your MCP server URL is like a password. Do not share it, as anyone with the URL can run your actions and access your data. If you believe your URL has been exposed, rotate it immediately.

Still need help?

If this article did not fix the issue:

• Ask in the Zapier Community for advice from experienced Zapier users.
• Contact the Zapier MCP team for feedback or help.
• Learn more about getting help and support with Zapier.