MCP open_url stays glued to the active Rig project — no more opening another project’s localhost just because a port is already in use.
Shipped 7 Aug 2026 · Full changelog · Download for Mac

Added

• Agent guidance explicitly covers hub port vs project ports, and always passing project_id to open_url

Fixed

• MCP open_url requires a Rig project_id (or project-scoped token) and prefers that project’s live detectedPort
• Refuses localhost URLs owned by a different project’s pid/cwd instead of opening the wrong app

Posted by Rig when this build hit userig.app/changelog. Feedback welcome in Bugs / Feature ideas — private tickets still go to Support.