Can't Authenticate Linear MCP in Automation cloud agents

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Background Agent (GitHub, Slack, Web, Linear)

Describe the Bug

When trying to add the Linear MCP to an automation agent, after clicking on Authenticate the url that I land on (https://mcp.linear.app/authorize…) prints the error “Invalid redirect URI. The redirect URI provided does not match any registered URI for this client.”

Steps to Reproduce

Create a an automation on https://cursor.com/automations
In the Tools section add the Linear MCP Server

Expected Behavior

Should open the linear auth modal

Operating System

MacOS

Version Information

Agent on the hosted cursor. com app

Additional Information

From what i see the redirect_uri param in the Auth url is https://www.cursor.com/agents/mcp/oauth/callback

I saw that someone already reported a similar issue that seems be fixed Linear MCP auth fails with “Invalid redirect URI” (cursor://anysphere.cursor-mcp/oauth/callback) (Worked fine for me in the macOS app)

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

5

Hey, thanks for the report and for finding the related thread. It’s the same class of bug, but in the automation/cloud agent context a different redirect URI is used: https://www.cursor.com/agents/mcp/oauth/callback, and Linear still doesn’t accept it on their side. That’s why it works on desktop, but not in automations.

We’re already tracking the issue, but I can’t share an exact ETA yet. Once we roll out a fix, I’ll reply in the thread.

If you need a workaround in the meantime, you can temporarily run Linear MCP locally via a self-hosted runtime, but for the native cursor.com/automations flow you’ll need to wait for the fix.