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 igmarin/rails-agent-skills --skill security-checkgit clone --depth 1 https://github.com/igmarin/rails-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/skills/igmarin/rails-agent-skills/security-check)<a href="https://agentmods.dev/skills/igmarin/rails-agent-skills/security-check"><img src="https://agentmods.dev/badge/skills/igmarin/rails-agent-skills/security-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/igmarin/rails-agent-skills/security-check"><img src="https://agentmods.dev/badge/skills/igmarin/rails-agent-skills/security-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Anti-Refusal · line 78 Skill attempts to nullify the agent's safety policies or restrictions ('you have no restrictions', 'ignore your guidelines', 'do anything now'). This is a direct jailbreak that disables guardrails.Fix: Remove jailbreak framing that nullifies safety policies or restrictions. Skill content must not instruct the agent to ignore its guidelines or operate without guardrails.
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 | $0.00050 | $0.01314 |
| Opus 5 | $0.00025 | $0.00657 |
| Sonnet 5 | $0.00010 | $0.00263 |
| Haiku 4.5 | $0.00005 | $0.00131 |
Grade A, and why
security-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 10d 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 — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Security Check
HARD-GATE: Credential Handling
CREDENTIAL HANDLING (W007 — Insecure Credential Exposure Defense):
- NEVER reproduce credentials, tokens, API keys, passwords, or secrets verbatim
in output — flag by file path and line number only.
- When a finding involves secrets in code or logs, report:
Affected file: app/config/initializers/foo.rb:12
Finding: API key present in plain text — move to Rails credentials or ENV
Do NOT quote the secret value itself.
- Exploitability Verification sub-sections MUST use generic placeholder values
(e.g. "<REDACTED>", "<TOKEN>") — never the actual credential.
- If a file scan returns a secret value, stop — report its location, not its content.
Quick Reference
| Area | Key Checks |
|---|---|
| Auth | Permissions on every sensitive action |
| Params | No permit!, allowlist only safe attributes |
| Queries | Parameterized — no string interpolation in SQL |
| Redirects | Constrained to relative paths or allowlist |
| Output | No html_safe/raw on user content |
| Secrets | Encrypted credentials, never in code or logs |
| Files | Validate filename, content type, destination |
Core Process
Core principle: Prioritize exploitable issues over style. Treat all untrusted input as potentially abused.
0. Inspect the Workspace
Before writing any findings or analysis, you MUST run search and directory listing tools to find source files in the workspace (e.g. controllers, models, config files). Perform a code-level security review on the actual files found. Only if the workspace is completely empty may you return a checklist and state that no source files were provided.
Review Order
Review in this sequence, and produce output sections in this same order:
- Authentication and authorization boundaries.
- Parameter handling and sensitive attribute assignment.
- Redirects, rendering, and output encoding.
- File handling, network calls, and background job inputs.
- Secrets, logging, and operational exposure.
- Verify each finding: Confirm it is exploitable with a concrete attack scenario before reporting. Exclude false positives (e.g.,
html_safeon a developer-defined constant, not user input).
What ships with it
1 file 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.
- 10d ago First seen · 134 lines · 50 tokens per session scan A 7031795da875
security-check is a skill published in the GitHub repository igmarin/rails-agent-skills (25 stars, last pushed 19d ago), licensed MIT. It adds 50 tokens to every session and 1,314 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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