Hey Damien Mesgard I usually go through pipedrive to create new MCP tool, pipedrive takes care of the authentification. To be honest, I am not sure how to create it using Atlassian link. My guess is that you'd need to add authentication to the url. I don't know about the specifics though.
If you need more hand on help, feel free to reach out to support@dust.tt. The team will probably be better positioned to help 😊