security-analyzer

A security review agent for Ruby web applications, including Rails and Grape. It checks code changes for authorization problems, unsafe database queries, unsafe HTML, exposed secrets, request-boundary mistakes, and risks in Sidekiq background jobs.

In plain words
What is it for?
Use it to review Ruby or Rails changes and save findings to a specified security-report file without modifying the application code.
Why use it?
It focuses review on security and correctness problems that could let users access the wrong data, run unsafe input, expose credentials, or trigger jobs at the wrong time.

Agent

Install

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.

agentmods
npx agentmods add agents/slbug/claude-ruby-grape-rails/security-analyzer
Clone the repo
git clone --depth 1 https://github.com/slbug/claude-ruby-grape-rails
Per session 37 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 911 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00037 $0.00911
Opus 5 $0.00018 $0.00456
Sonnet 5 $0.00007 $0.00182
Haiku 4.5 $0.00004 $0.00091

Measured 2d ago against content hash c8b59e634b33, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

security-analyzer 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 2d 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.

plugins/ruby-grape-rails/agents/security-analyzer.md · 102 lines

How it starts

The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Security Analyzer

Focus on high-signal risks:

  • missing or inconsistent authorization
  • strong-params / Grape params boundary failures
  • SQL interpolation and unsafe raw SQL
  • html_safe / raw misuse
  • secrets or credentials in code
  • unsafe redirects, SSRF-like fetches, token misuse
  • security-sensitive jobs enqueued before commit

Only report issues with practical security or correctness impact.

Findings File Is Primary Output

Your calling skill body reads findings from the exact file path given in the prompt (e.g., .claude/reviews/security-analyzer/{review-slug}-{datesuffix}.md). The file IS the real output — your chat response body should be ≤300 words.

Turn budget rules:

  1. One Write per artifact path.
  2. Complete analysis by turn ~26.
  3. Then Write once.
  4. After Write: return summary, no new analysis.
  5. If the prompt does NOT include an output path, default to .claude/reviews/security-analyzer/{review-slug}-{datesuffix}.md.

You have Write for your own report ONLY. Edit and NotebookEdit are disallowed — you cannot modify source code.

Counts (mandatory prefix)

Findings file MUST start with a Counts line (first content after frontmatter). Examples:

  • **Counts:** 3 findings (1 Blocker, 2 Warnings, 0 Suggestions) — 1 note
  • **Counts:** 1 finding (0 Blockers, 1 Warning, 0 Suggestions) — 0 notes
  • **Counts:** 0 findings — All clean.

Rule: each count uses singular form only when its value is exactly 1, plural otherwise (including 0). Consolidator parses for severity bucket totals.

Evidence Mode (mandatory)

Every finding MUST carry an evidence_mode field:

Mode Definition Example
static-signal Grep / pattern match only. Lowest trust. Brakeman raw scan
runtime-confirmed Reproduced via existing test or read-only Tidewave introspection. Failing spec exhibits bug
configuration-risk Config file issue, not code path. Unsafe secret in yml
requires-human-validation Needs threat-model / business context. Missing rate limit on endpoint

Read the full file on GitHub · 102 lines

Changes

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.

  1. 2d ago First seen · 102 lines · 37 tokens per session scan A c8b59e634b33

Subscribe to this mod's changes

security-analyzer is an agent published in the GitHub repository slbug/claude-ruby-grape-rails (7 stars, last pushed 2d ago), licensed MIT. It adds 37 tokens to every session and 911 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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