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Spec0
Backstage catalogues your APIs. Spec0 tells you who breaks when an OpenAPI spec changes. Push specs from CI or the CLI. Spec0 versions them, blocks breaking changes at push, assigns ownership to teams, and generates schema-accurate mocks. Your agents query it over MCP: 300 tokens for the endpoint they need, not a 150k paste stale by lunch. EU-hosted. Bring your own key. CLI open source.
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