A code-scanning guide for finding leaked secrets such as API keys, passwords, tokens, database connection strings, and private keys. It uses Betterleaks and can check both current files and Git history.

Use it to scan a project, ignore known findings with a baseline, validate detected credentials, or inspect the Git history for leaks.

It helps catch credentials that could be exposed through source code, configuration files, or past commits.

rb:secrets — Skill for Claude Code by slbug/claude-ruby-grape-rails

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.

Any agent

npx skills add slbug/claude-ruby-grape-rails --skill secrets-scan

Clone the repo

git clone --depth 1 https://github.com/slbug/claude-ruby-grape-rails

Made for: Claude Code.

Or install ruby-grape-rails, the plugin that ships this one along with the rest of its 52 skills, 19 agents, 17 hooks.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/secrets-scan/github.svg)](https://agentmods.dev/skills/slbug/claude-ruby-grape-rails/secrets-scan)

Your own site

<a href="https://agentmods.dev/skills/slbug/claude-ruby-grape-rails/secrets-scan"><img src="https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/secrets-scan/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/slbug/claude-ruby-grape-rails/secrets-scan"><img src="https://agentmods.dev/badge/skills/slbug/claude-ruby-grape-rails/secrets-scan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 483 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00036	$0.00483
Opus 5.5	$0.00014	$0.00193
Sonnet 5.5	$0.00007	$0.00097
Haiku 4.5	$0.00004	$0.00048

Measured 1mo ago against content hash d6194089fb51, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

rb:secrets scanned grade B with 1 finding 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 1mo 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

- Linux: `sudo dnf install betterleaks`

plugins/ruby-grape-rails/skills/secrets-scan/SKILL.md · 81 lines

What it actually says

Secrets Scan

Detect leaked secrets in your codebase using betterleaks.

Requirements

Requires betterleaks to be installed:

macOS: brew install betterleaks
Linux: sudo dnf install betterleaks
Or download from the betterleaks releases page

Usage

/rb:secrets                           # Scan current directory
/rb:secrets app/                      # Scan specific path
/rb:secrets --baseline leaks.json     # Use baseline to ignore known issues
/rb:secrets --validate                # Validate secrets against live APIs
/rb:secrets --git                     # Scan git history

What It Scans

API keys (GitHub, AWS, Stripe, etc.)
Database connection strings
Passwords and tokens
Private keys
Environment files (.env)
Configuration files

Iron Laws

Never commit .env files - Add to .gitignore
Use Rails credentials - Rails.application.credentials
No secrets in code - Use environment variables
Rotate exposed keys immediately - If found, rotate them

Output

Returns findings with severity:

## Secrets Scan Results

### Critical
- config/database.yml: Contains production password
- .env.staging: AWS access key exposed

### High
- app/services/stripe.rb: Hardcoded API key

### Recommendations
- Move secrets to Rails credentials
- Add .env* to .gitignore
- Rotate exposed API keys

Configuration

Create .betterleaks.toml in project root for custom rules:

[[rules]]
id = "custom-api-key"
description = "Custom API key pattern"
regex = '''api-key-[a-zA-Z0-9]{32}'''
keywords = ["api-key"]

[[allowlists]]
description = "Test fixtures"
paths = ['''test/fixtures/.*''']

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.

1mo ago First seen · 81 lines · 36 tokens per session scan B d6194089fb51

Subscribe to this mod's changes

rb:secrets is a skill published in the GitHub repository slbug/claude-ruby-grape-rails (7 stars, last pushed 16d ago), licensed MIT. It adds 36 tokens to every session and 483 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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