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backstage release v3.20.0

Oct 22, 2026 Developer Portal backstage v3.20.0

Added

(agent-platform) The agent’s default workspace in the agent form and the session pickers by @teemow — More options in the agent form has Default workspace, also shown on the agent’s page. Starting a session with the agent preselects it, unless you last picked another workspace with that agent in this browser. Needs agent-manager 2.11.0 or later.

Fixed

(muster) The inbox’s first read waits for the MCP sign-in status to settle by @teemow — When a connector waits for your MCP sign-in as the portal opens, the notification inbox shows its summary toast again, which v3.19.0 had lost.

Full Changelog: https://github.com/giantswarm/backstage/compare/v3.19.1...v3.20.0