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backstage release v0.135.3

Jun 11, 2026 Developer Portal backstage v0.135.3

Fixed

Muster: fix the Workflows page failing with “tool not found” against real muster servers. The muster aggregator only exposes its meta-tools over MCP, so the workflow proxy now invokes the core workflow tools through the call_tool meta-tool and unwraps its result envelope. See ./docs/releases/v0.135.3-changelog.md for more information.