secret-scan

secret-scan is a skill for Claude Code from berkcangumusisik/claude-code-practices. It costs 18 tokens per session (391 once invoked), scanned A, original, MIT.

A code scanner that looks for accidentally committed passwords, API keys, tokens, and private keys, including secrets in current and older Git history.

In plain words
What is it for?
Use it to inspect source files and Git history, review possible leaks, and identify credentials that should be rotated and removed.
Why use it?
It helps detect credentials that could let someone access services or data.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to inspect source files and Git history, review possible leaks, and identify credentials that should be rotated and removed.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/berkcangumusisik/claude-code-practices/secret-scan
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 berkcangumusisik/claude-code-practices --skill secret-scan
Clone the repo
git clone --depth 1 https://github.com/berkcangumusisik/claude-code-practices

Made for: Claude Code.

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.

agentmods badge for secret-scan

README.md
[![agentmods](https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/secret-scan/github.svg)](https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/secret-scan)
Your own site
<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/secret-scan"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/secret-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.

agentmods 80×15 button for secret-scan

Your own site · 80×15
<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/secret-scan"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/secret-scan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 391 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00018 $0.00391
Opus 5 $0.00009 $0.00196
Sonnet 5 $0.00004 $0.00078
Haiku 4.5 $0.00002 $0.00039

Measured 6d ago against content hash 0509b85eb57c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

secret-scan 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.

skills/secret-scan/SKILL.md · 39 lines

What it actually says

Secret Scanner

# Common secret patterns
grep -rn \
  -e "password\s*=\s*['\"][^'\"]\+" \
  -e "secret\s*=\s*['\"][^'\"]\+" \
  -e "api_key\s*=\s*['\"][^'\"]\+" \
  -e "token\s*=\s*['\"][^'\"]\+" \
  -e "sk-[a-zA-Z0-9]\{20,\}" \
  -e "ghp_[a-zA-Z0-9]\{36\}" \
  -e "AKIA[0-9A-Z]\{16\}" \
  -e "-----BEGIN.*PRIVATE KEY-----" \
  --include="*.ts" --include="*.js" --include="*.env*" --include="*.json" \
  --exclude-dir=node_modules --exclude-dir=dist \
  . 2>/dev/null | grep -v "\.test\." | grep -v "example\|placeholder\|your_key_here"

Also check:

git log --all --full-history -- "*.env" | head -10
git log --diff-filter=D --summary | grep ".env" | head -10

For each finding:

  • Show file, line, and the leaked value (partially redacted)
  • Confirm if it's a real secret or a false positive
  • If real: advise rotating the credential immediately, then removing from git history

Note: Rotate first, remove from history second - a removed commit is not the same as a revoked token.

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. 6d ago First seen · 39 lines · 18 tokens per session scan A 0509b85eb57c

Subscribe to this mod's changes

secret-scan is a skill published in the GitHub repository berkcangumusisik/claude-code-practices (10 stars, last pushed 4mo ago), licensed MIT. It adds 18 tokens to every session and 391 once invoked, about $0.0001 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 2026-09-03.