Claude Authenticity Skill Verify whether an API endpoint serves genuine Claude and optionally extract any injected system prompt. No installation required beyond . Copy the code blocks below directly into a single file and run — no openjudge, no cookbooks, no other setup. The 9 checks (mirrors claude-verify) | # | Check | Weight | Signal | |---|-------|--------|--------| | 1 | Signature 长度 | 12 | field in response (official API exclusive) | | 2 | 身份回答 | 12 | Reply mentions / / | | 3 | Thinking 输出 | 14 | Extended-thinking block present | | 4 | Thinking 身份 | 8 | Thinking text references Claude…