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/nexus-substrate/nexus-agents/security-scanningnpx skills add nexus-substrate/nexus-agents --skill security-scanninggit clone --depth 1 https://github.com/nexus-substrate/nexus-agentsWrote 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/nexus-substrate/nexus-agents/security-scanning)<a href="https://agentmods.dev/skills/nexus-substrate/nexus-agents/security-scanning"><img src="https://agentmods.dev/badge/skills/nexus-substrate/nexus-agents/security-scanning.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 5.1 | $0.00051 | $0.01880 |
| Opus 5 | $0.00026 | $0.00940 |
| Sonnet 5 | $0.00010 | $0.00376 |
| Haiku 4.5 | $0.00005 | $0.00188 |
Grade A, and why
security-scanning 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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Security Scanning Skill
Trigger Conditions
Run when ANY occur:
- System review (Phase 4 integration)
- New CodeQL alerts appear after CI
- Secret scanning alert notification
- Manual request ("check security alerts")
Phase 1: Triage Alerts
# Check CodeQL alerts (open only)
gh api repos/{owner}/{repo}/code-scanning/alerts \
--jq '[.[] | select(.state == "open")] | length'
# Check secret scanning alerts
gh api repos/{owner}/{repo}/secret-scanning/alerts \
--jq '[.[] | select(.state == "open")] | length'
Categorize by severity: critical > high > medium > low.
Phase 2: CodeQL Fixes
Priority order for CodeQL alert categories:
| Category | Fix Pattern |
|---|---|
js/shell-command-constructed-from-input |
Use execFile() or validate inputs |
js/insecure-randomness |
Replace Math.random() with crypto.randomInt() |
js/biased-cryptographic-random |
Use crypto.randomInt() or rejection sampling |
js/polynomial-redos |
Bound quantifiers, use [ \t]* not \s* |
js/incomplete-sanitization |
Single-quote shell escaping |
js/incomplete-multi-character-sanitization |
Loop-based stripping for unclosed tags |
js/missing-rate-limiting |
Add rate limiter middleware |
js/incomplete-url-scheme-check |
Zod .refine() for HTTP/HTTPS only |
For each alert:
- Read the affected file and understand the context
- Write a test that reproduces the vulnerability
- Apply the fix
- Run tests to verify no regressions
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.
- 6d ago First seen · 173 lines · 51 tokens per session scan A 95cb8da9bb2f
security-scanning is a skill published in the GitHub repository nexus-substrate/nexus-agents (18 stars, last pushed yesterday), licensed MIT. It adds 51 tokens to every session and 1,880 once invoked, about $0.0003 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 2026-08-30.
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