Mcp Surface

Whether the tool surface actually built, and how wide it is.

The failure the owner suspected all day and nothing could confirm or deny: a registry that came up empty after a deploy would serve an MCP endpoint with no tools on it, and every client would report that its tools had vanished — which is exactly what he was seeing, for an unrelated reason. Nothing reported the registry's size, so the suspicion could not be settled.

In-process and free: it counts what this container imported at startup. A count of zero is our fault and says so with a 503, because a surface with no tools is not a surface.