Detect AI
AI-content scorer that requires a paid HumanizerAI subscription to return anything.
Test report
- Verdict
- Tested · Didn't pass
- Tested
- Jul 15, 2026
- Environment
- Claude Code 2.x (agent harness)
- Upstream re-checked
- Aug 10, 2026 · 7c74412
Live-tested the documented API call with no key set: got a 401 'API key required' from https://humanizerai.com/api/v1/detect, and the site's own pricing page shows no free tier (plans start at $10-35/mo). The repo's own README table lists detect-ai as 'Free' while its Setup section requires subscribing to Pro/Business to generate the key — a direct contradiction confirmed by the live 401.
Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works
- Installs cleanly 5/5
- Triggers reliably 5/5
- Output vs. baseline 3/10
- Docs & honesty 1/5
What Detect AI does
Calls the HumanizerAI hosted API to score text 0-100 for likelihood of AI authorship, with sub-metrics like perplexity and burstiness. Triggers when checking content before publishing, but is non-functional without a HUMANIZERAI_API_KEY, which requires a paid Pro ($19.99/mo) or Business ($49.99/mo) subscription despite the README listing it as 'Free'.
How to install Detect AI
git clone https://github.com/humanizerai/agent-skills
cd agent-skills
mkdir -p ~/.claude/skills
cp -r skills/detect-ai ~/.claude/skills/detect-ai
Skills live in ~/.claude/skills/ (global) or .claude/skills/
(per-project). Restart Claude Code after installing.
Commands — how to trigger Detect AI
-
/detect-aiAI-content scorer that requires a paid HumanizerAI subscription to return anything.
It also activates on plain-language prompts like these:
-
score this marketing paragraph for how likely it is AI written -
check this blog post for AI content signals before I publish it -
run this draft through an AI detector and give me a score
Frequently asked questions
- Is the Detect AI skill free?
- Yes. The skill itself is free from humanizerai/agent-skills. SkillProof publishes the install command and an independent test verdict at no cost.
- Does Detect AI work with Claude Code?
- We tested it with Claude Code 2.x (agent harness) on Jul 15, 2026. Verdict: Tested · Didn't pass. Live-tested the documented API call with no key set: got a 401 'API key required' from https://humanizerai.com/api/v1/detect, and the site's own pricing page shows no free tier (plans start at $10-35/mo). The repo's own README table lists detect-ai as 'Free' while its Setup section requires subscribing to Pro/Business to generate the key — a direct contradiction confirmed by the live 401.
- How do I install Detect AI?
- Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
- Can I use Detect AI with Cursor, Copilot, Gemini CLI, Codex or other AI tools?
- The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.