A SolidWorks MCP tool for assembly mates. On a real column assembly (2 nodes, 6 mates) native error count was 0, but 3 mates had references that couldn't be read. On an 18-node frame with 51 mates, also 0 errors, but 4 unresolved references. The PR says a native error count of 0 can't be read as complete references or as safe to write, so the tool now stays read-only with all_mates_sufficient left as null. 804 offline tests, 803 pass. PR is in Chinese.