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 skills add nikhilreddy3888/public-api-toolkit --skill url_checkgit clone --depth 1 https://github.com/nikhilreddy3888/public-api-toolkitWrote 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/nikhilreddy3888/public-api-toolkit/url_check)<a href="https://agentmods.dev/skills/nikhilreddy3888/public-api-toolkit/url_check"><img src="https://agentmods.dev/badge/skills/nikhilreddy3888/public-api-toolkit/url_check/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/skills/nikhilreddy3888/public-api-toolkit/url_check"><img src="https://agentmods.dev/badge/skills/nikhilreddy3888/public-api-toolkit/url_check.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 | $0.00034 | $0.00367 |
| Opus 5 | $0.00017 | $0.00183 |
| Sonnet 5 | $0.00007 | $0.00073 |
| Haiku 4.5 | $0.00003 | $0.00037 |
Grade A, and why
url_check 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 8d 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
URL Check
Scan and analyze URLs for malware, phishing, and security threats.
APIs
urlscan.io
- Endpoint:
https://urlscan.io/api/v1/scan/ - Method: POST
- Auth: API key required (free registration)
- Docs: https://docs.urlscan.io/
- Search API:
https://urlscan.io/api/v1/search/
ContrastAPI (free, no key)
- Endpoint:
https://api.contrastcyber.com/v1/threat/{domain} - Method: GET
- Auth: None (100/hour)
- Docs: https://api.contrastcyber.com/
| Parameter | Type | Description |
|---|---|---|
| url | string | URL to scan |
| visibility | string | public/unlisted/private |
Example Queries
- "Check if this URL is safe: https://example.com"
- "Scan for malware: suspicious-link.net"
- "Check domain reputation for company.io"
Response
{
"verdicts": {
"overall": "malicious",
"engines": {
"malicious": 5,
"suspicious": 2,
"harmless": 10
}
}
}
Use Cases
- Validate suspicious links
- Brand protection / phishing detection
- Security research
- Link preview generation
Token Savings
20-40x vs LLM analysis of security threats.
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.
- 8d ago First seen · 62 lines · 34 tokens per session scan A 1148da6026aa
url_check is a skill published in the GitHub repository nikhilreddy3888/public-api-toolkit (2 stars, last pushed 4mo ago), licensed MIT. It adds 34 tokens to every session and 367 once invoked, about $0.0002 per session on Opus 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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