{"preview":true,"note":"Response shape only. The paid GET /mcp-registry-remote-drift takes a registry server name, reads its declared remote endpoints and probes each with an MCP initialize handshake. A refusal carrying a WWW-Authenticate challenge is reported separately from a bare refusal. Unreachable is reported as unknown, never as closed. Demand for this route is not measured.","example":{"query":"inference","server_name":"ac.inference.sh/mcp","posture_undeclared":true,"remotes":[{"server_name":"ac.inference.sh/mcp","url":"https://sh.inference.ac","transport":"streamable-http","http_status":401,"www_authenticate":"Bearer realm=\"mcp\"","posture":"auth_required_spec","note":"Refuses with a WWW-Authenticate challenge."},{"server_name":"ac.inference.sh/mcp","url":"https://api.inference.sh/mcp","transport":"streamable-http","http_status":200,"www_authenticate":null,"posture":"open","note":"Answered the initialize handshake without credentials."}],"actionable":true,"detail":"2 remote endpoints probed; 1 requires credentials. The registry entry says nothing about authentication, so a client discovers this only by trying.","checked_at":"2026-08-16T00:30:00.000Z"}}