Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/biggora/claude-plugins-registry/captchanpx skills add biggora/claude-plugins-registry --skill captchagit clone --depth 1 https://github.com/biggora/claude-plugins-registryWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/biggora/claude-plugins-registry/captcha)<a href="https://agentmods.dev/skills/biggora/claude-plugins-registry/captcha"><img src="https://agentmods.dev/badge/skills/biggora/claude-plugins-registry/captcha.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00148 | $0.03295 |
| Opus 5 | $0.00074 | $0.01648 |
| Sonnet 5 | $0.00030 | $0.00659 |
| Haiku 4.5 | $0.00015 | $0.00330 |
Grade A, and why
captcha scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
result = subprocess.run(cmd, capture_output=True, text=True, env=os.environ) How it starts
The opening of the file, as written. The whole thing — 346 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CAPTCHA Solver Skill
Solve CAPTCHAs programmatically in web automation workflows.
How Token-Based CAPTCHA Solving Works
Modern CAPTCHAs (reCAPTCHA, hCaptcha, Turnstile) don't require reading distorted text — they issue a signed token when solved. A third-party service solves the challenge on your behalf and returns that token. You inject it into the page, and the page thinks the user solved it.
Page with CAPTCHA
│
├─ 1. Extract sitekey + page URL
├─ 2. Submit to solving service (waits 15–45s)
├─ 3. Receive token string
├─ 4. Inject token into hidden field on page
├─ 5. Trigger the CAPTCHA callback
└─ 6. Submit form / continue automation
Tokens expire in ~2 minutes — solve immediately before submitting.
Supported CAPTCHA Types
| Type | --type flag |
How to detect on page |
|---|---|---|
| reCAPTCHA v2 (checkbox) | recaptcha-v2 |
.g-recaptcha div, [data-sitekey] attribute |
| reCAPTCHA v2 invisible | recaptcha-v2 --invisible |
No visible widget; grecaptcha.execute() call |
| reCAPTCHA v3 | recaptcha-v3 |
grecaptcha.execute(sitekey, {action:...}) in JS |
| hCaptcha | hcaptcha |
.h-captcha div or [data-hcaptcha-sitekey] |
| Cloudflare Turnstile | turnstile |
.cf-turnstile div |
| Image/text CAPTCHA | image |
<img> with "captcha" in src or alt |
Read references/captcha-types.md for per-type detection JS snippets and injection patterns.
Solving Services
You need an API key from a solving service. All three below use the same API format, so the solver script works with any of them:
| Service | Flag | Speed | Cost/1K |
|---|---|---|---|
| 2captcha (recommended) | --service 2captcha |
20–40s | ~$1.00 |
| CapMonster Cloud | --service capmonster |
10–30s | ~$0.60 |
| Anti-Captcha | --service anticaptcha |
15–35s | ~$0.70 |
Set credentials via environment variables (preferred):
export CAPTCHA_API_KEY=your_key_here
export CAPTCHA_SERVICE=2captcha
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 346 lines · 148 tokens per session scan A b1a542f5497e
captcha is a skill published in the GitHub repository biggora/claude-plugins-registry (2 stars, last pushed 6d ago), licensed MIT. It adds 148 tokens to every session and 3,295 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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