The MCP now reports structure and mate health for 129 to 500 node assemblies in read-only mode, where before it lost the whole report past the 128-node write limit. They spell out that an empty candidate list means no search ran, not that no mates are missing. Conveyor sub-assemblies are still blocked by external modelling references. A real lift module read 150 nodes and 30 root mates across 3 sub-assembly instances. Agents in CAD hit hard limits on how much of an assembly they can safely act on.