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backstage release v0.135.0

Jun 11, 2026 Developer Portal backstage v0.135.0

Added

Muster: support muster MCP servers behind per-user auth (authProvider entries in aiChat.mcp). The muster frontend now forwards the user’s OAuth token to the muster backend proxy, which opens per-user MCP sessions. Previously such servers were reported as unconfigured and the Workflows page failed with a 503.

Changed

The shared MCP client cache moved from the AI chat backend plugin to @giantswarm/backstage-plugin-gs-node and is reused by the muster backend plugin.

Fixed

Muster: an aiChat.mcp entry without a name no longer crashes plugin registration; execution fetch errors are surfaced in the workflow detail UI instead of being silently swallowed; duplicate workflow step ids no longer drop nodes from the graph; query parameter validation rejects empty and repeated values. See ./docs/releases/v0.135.0-changelog.md for more information.