Detects a Model Context Protocol server exposing the Streamable HTTP transport that completes the JSON-RPC 2.0 `initialize` handshake without any credentials. The MCP lifecycle requires `initialize` to be the first interaction on a connection, and a spec-compliant server answers it with an InitializeResult carrying `protocolVersion`, `capabilities` and `serverInfo`. Receiving that result from an unauthenticated POST shows the endpoint performs no authorization before entering the operation phase, so any caller can go on to enumerate and invoke the tools, resources and prompts the server exposes.
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