claude-authenticity
Detect whether an API endpoint is backed by genuine Claude (not a wrapper, proxy, or impersonator) using 9 weighted rule-based checks that mirror the claude-verify project. Also extracts injected system prompts from providers that override Claude's identity. Fully self-contained — copy the code below and run, no extra packages beyond httpx. Use when the user wants to verify a Claude API key or endpoint, check if a third-party Claude service is authentic, audit API providers for Claude authenticity, test multiple models in parallel, or discover what system prompt a provider has injected.
Profile →npx skills add agentscope-ai/OpenJudge --skill claude-authenticity --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# 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 ru
- Gather from user before running
- Self-contained script
- Interpreting results
- Score patterns
- Why APITYPE = "anthropic" matters
- Extracting injected system prompts
- Troubleshooting
- HTTP 400 — maxtokens must be greater than thinking.budgettokens
- All replies are "I can't discuss that."
- Score is low despite using the official API
pip install httpx python claude_authenticity.py
What does the claude-authenticity skill do?
Detect whether an API endpoint is backed by genuine Claude (not a wrapper, proxy, or impersonator) using 9 weighted rule-based checks that mirror the claude-verify project. Also extracts injected system prompts from providers that override Claude's identity. Fully self-contained — copy the code below and run, no extra packages beyond httpx. Use when the user wants to verify a Claude API key or endpoint, check if a third-party Claude service is authentic, audit API providers for Claude authenticity, test multiple models in parallel, or discover what system prompt a provider has injected.
How do I install it?
Run `npx skills add agentscope-ai/OpenJudge --skill claude-authenticity --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From agentscope-ai/OpenJudge, a repository with 764 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.