Independent log matched 23 MCP tool definitions, then names changed five days later

A transparency log for MCP server tool definitions, HISTOR, sought to check whether an independent observer could corroborate one of its records. Using LEGION-tlog, which publishes timestamps and SHA-256 fingerprints per tool, the team compared the server com.aiapplyd/aiapplyd. On 19 October, all 23 tool fingerprints matched a LEGION observation taken about 24 minutes later. On 24 October, every tool name changed from an aiapplyd_ prefix to getmattered_, while the suffixes stayed the same and the archived LEGION record still showed only the October 19 entry. By 31 October, HISTOR had recorded a new 40-tool set whose names appeared nowhere in the archived LEGION record. The authors note the evidence does not establish why LEGION had no later entry or whether the tools behave identically, and they provide an offline replay bundle to verify the results.