Where a secure build environment and process exist, the deploy stage can require that the artifact (for example a container image) being deployed was generated by that secure build, verified through the signed attestations; there is evidence that the image was scanned for vulnerabilities, with attestation of the scan, and deployment can be allowed or blocked according to organisation-defined policies applied to that evidence.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.