Borrowing it
Nothing to install: this file belongs to Captcha-Sonic/Agent-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Captcha-Sonic/Agent-skills/main/CLAUDE.mdgit clone --depth 1 https://github.com/Captcha-Sonic/Agent-skillsWrote 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/instructions/captcha-sonic/agent-skills/claude-md)<a href="https://agentmods.dev/instructions/captcha-sonic/agent-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/captcha-sonic/agent-skills/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/captcha-sonic/agent-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/captcha-sonic/agent-skills/claude-md.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00400 | $0.00400 |
| Opus 5.5 | $0.00160 | $0.00160 |
| Sonnet 5.5 | $0.00080 | $0.00080 |
| Haiku 4.5 | $0.00040 | $0.00040 |
Grade A, and why
Agent-skills CLAUDE.md scanned grade A with 0 findings 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 2mo 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
CaptchaSonic Plugin for Claude Code
What This Plugin Does
This plugin gives you the ability to solve any CAPTCHA using the CaptchaSonic API. It provides an MCP server with 3 tools and 3 skills for guided workflows.
MCP Tools Available
| Tool | Description | API Key |
|---|---|---|
health_check |
Check if the CaptchaSonic API is online | Not needed |
get_balance |
Check account balance in USD | Required |
solve_captcha |
Solve any CAPTCHA type from image or URL | Required |
Setup
The MCP server is auto-configured via .mcp.json. Set your API key:
claude mcp add sonic --env SONIC_API_KEY=sonic_xxxx -- npx -y @captchasonic/mcp-server
Get your key at https://captchasonic.com (starts with sonic_).
Skills
/captchasonic:captchasonic-solve— Solve any CAPTCHA (reCAPTCHA, Turnstile, Geetest, OCR, etc.)/captchasonic:captchasonic-balance— Check account balance/captchasonic:captchasonic-setup— First-time setup and verification
Supported CAPTCHA Types
PopularCaptcha, reCAPTCHA v2/v3, Cloudflare Turnstile, Geetest (slide/click/nine), AWS WAF, TikTok, Binance, OCR, Audio, and generic sliders.
Solution Types
grid→ tile indices [0, 3, 5] (click these tiles)text→ ["abc123"] (type this text)slide→ x=42 (drag 42px right)click→ [{x,y}] (click at coordinates)single→ [true, false] (select true tiles)
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.
- 2mo ago First seen · 44 lines · 400 tokens per session scan A 8f67e89090a7
Agent-skills CLAUDE.md is an instructions file published in the GitHub repository Captcha-Sonic/Agent-skills (1 stars, last pushed 4mo ago), licensed MIT. It adds 400 tokens to every session, about $0.0016 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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