Unofficial reconstructed notes, not a Cursor changelog. Some surfaces in a desktop build are gated and may not be live yet.
v3.17.21
stablePublished Aug 25, 2026
✦NEW4⛨SECURITY1
Changelog
Features
- Sidebar now can render nested rows in the file tree.
- Publish button now can hide on a cloud agent and offer reconnect when the session drops.
- Cloud MCP now runs an auth flow before the agent uses a connected MCP server.
- Cloud agent now knows when it is on the base branch before you publish.
Notes
- Feature gates still hide some of these surfaces; they shipped in the 3.17.21 desktop build but may not be live yet.