Connect Devin to PrompTessor MCP

Add PrompTessor as a custom remote HTTP server in Devin. OAuth is completed in the browser after the configuration is saved; do not use a PrompTessor REST API key as an authentication header.

Open Settings > Connections > MCP servers and select Add a custom MCP.

1. 1

   Open MCP servers

   In Devin, go to Settings > Connections > MCP servers. Adding and authenticating a custom server requires the Manage MCP Servers permission.

2. 2

   Create a custom server

   Select Add a custom MCP. Enter PrompTessor as the server name and add a short description such as “Prompt generation and management tools.”

3. 3

   Choose HTTP transport

   Select HTTP (Streamable HTTP), paste the Server URL shown below, and choose OAuth as the authentication method.

4. 4

   Save before testing

   Save the configuration. The Test listing tools action remains disabled until the custom server has been saved.

5. 5

   Authorize and test

   Select Test listing tools, open the authorization URL, sign in to PrompTessor, and approve the requested scopes.

6. 6

   Verify in a session

   Start a Devin session and ask it to check your PrompTessor usage. A get_usage result confirms the integration.

Server name

PrompTessor

Server URL

https://mcp.promptessor.com/mcp

Transport

HTTP

Authentication

OAuth

Headers

None