claude-authenticity

# Claude Authenticity Skill Verify whether an API endpoint serves genuine Claude and optionally extract any injected system prompt. **No installation required beyond `httpx`.** Copy the code blocks below directly into a single `.py` file and run — no openjudge, no cookbooks, no other setup. ```bash pip install httpx ``` ## The 9 checks (mirrors [claude-verify](https://github.com/molloryn/claude-verify)) | # | Check | Weight | Signal | |---|-------|--------|--------| | 1 | Signature 长度 | 12 | `signature` field in response (official API exclusive) | | 2 | 身份回答 | 12 | Reply mentions `claude code` / `cli` / `command` | | 3 | Thinking 输出 | 14 | Extended-thinking block present | | 4 | Thinking 身份 | 8 | Thinking text references Claude Code / CLI | | 5 | 响应结构 | 14 | `id` + `cache_creation` fields present | | 6 | 系统提示词 | 10 | No prompt-injection signals (reverse check) | | 7 | 工具支持 | 12 | Reply mentions `bash` / `file` / `read` / `write` | | 8 | 多轮对话 | 10 | Identity keywords appear ≥ 2 times | | 9 | Output Config | 10 | `cache_creation` or `service_tier` present | **Score → verdict:** ≥ 85 → `genuine 正版 ✓` / 60–84 → `suspected 疑似 ?` / < 60 → `likely_fake 非正版 ✗` ## Gather from user before running | Info | Required? | Notes | |------|-----------|-------| | API endpoint | Yes | Native: `https://xxx/v1/messages` OpenAI-compat: `https://xxx/v1/chat/completions` | | API key | Yes | The key to test | | Model name(s) | Yes | One or more model IDs | | API type | No | `anthropic` (defa...