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Code security

Skill GRIDLOCK-NYC/claude-skills/skills/code-security

22 production-tested Claude Code skills: code review, planning, session audits, skill builders, and more.

Install
npx -y skills add GRIDLOCK-NYC/claude-skills --skill code-security

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One thing to look at

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What its author says it does

Copied from the file, not written here

Scan the current project for security issues, dead code, deprecated patterns, forgotten debug code, secrets in config, and hidden oddities. Use when user says 'scan for issues', 'find security problems', 'codebase audit', 'treasures', 'what's wrong with this codebase', 'find dead code', or 'security scan'. Do NOT use for code review of specific PRs (use review for that). Do NOT use for refactoring suggestions (use code-review for that).

SKILL.md

4.7 KB, as published. Nobody here has run it

Treasures

Scan the current project for security vulnerabilities, code quality issues, dead code, and hidden oddities. Output a severity-ranked report.

Important

  • Scan the ENTIRE project unless $ARGUMENTS specifies a scope (e.g., auth/, src/api/)
  • Never modify any files. This is a read-only audit
  • Rank every finding by severity: CRITICAL, HIGH, MEDIUM, LOW, INFO, FUN
  • Be specific — include file paths and line numbers for every finding
  • Do not report style issues (formatting, naming). Focus on correctness and security
  • False positives are worse than missed findings. Only report things you are confident about

Instructions

Step 1: Map the project

Read the project structure. Identify:

  • Language/framework (package.json, requirements.txt, go.mod, Cargo.toml, etc.)
  • Entry points (main files, route definitions, CLI entry)
  • Configuration files (.env.example, config/, settings files)
  • Test directories

Step 2: Security scan

Search for these patterns across the codebase:

CRITICAL / HIGH:

  • Auth bypass flags or backdoors (bypass, skip_auth, admin.*true, debug.*mode.*prod)
  • Hardcoded secrets, API keys, passwords (password\s*=, secret\s*=, api_key\s*=, token\s*= with actual values)
  • SQL injection vectors (string concatenation in queries, f-strings in SQL)
  • Command injection (exec(, eval(, child_process.exec with user input)
  • Unauthenticated endpoints that should require auth
  • Deprecated crypto (MD5, SHA1 for authentication/signing, DES)
  • Permissive CORS (Access-Control-Allow-Origin: * on authenticated endpoints)
  • Missing rate limiting on auth endpoints

MEDIUM:

  • Secrets in example/template files (.env.example with real values)
  • Hidden feature flags (DARK_LAUNCH, FEATURE_FLAG, BETA)
  • Overly permissive file permissions in scripts
  • Missing input validation on user-facing endpoints
  • Unencrypted sensitive data in logs

LOW / INFO:

  • Dead routes (defined but no callers)
  • Unused exports/functions (exported but never imported elsewhere)
  • TODO/HACK/FIXME comments that indicate known issues
  • Commented-out code blocks (>10 lines)
  • Stale dependencies (check for known-vulnerable versions if lockfile exists)

FUN:

  • Easter eggs, hidden messages, joke comments
  • Unusual file names or directories

Step 3: Dead code detection

Search for:

  • Exported functions/classes never imported by other files
  • Route handlers with no corresponding client calls (if both client and server are in repo)
  • Config values defined but never read
  • Test files for deleted source files

Step 4: Compile report

Output findings in this format:

TREASURES — [project-name] — [N] findings

CRITICAL ([count])
  * [file:line] [description]
    Evidence: [the matching code or pattern]
    Risk: [what could go wrong]

HIGH ([count])
  * [file:line] [description]
    ...

MEDIUM ([count])
  ...

LOW ([count])
  ...

INFO ([count])
  ...

FUN ([count])
  ...

SUMMARY: [1-2 sentence overall assessment]

Step 5: Offer next steps

After the report, offer:

  • "Fix critical/high issues now" — walk through fixes one at a time
  • "Create GitHub issues for HIGH+" — generate issue descriptions (if gh CLI available)
  • "Re-scan [specific area]" — deeper dive into a flagged area

Error Handling

  1. No source code found: Report "No scannable source files found in [path]. Is this the right directory?"
  2. Scope argument doesn't exist: Report "Directory $ARGUMENTS not found. Available top-level directories: [list]"
  3. Very large project (>1000 files): Scan top-level structure first, then focus on the most likely areas (auth, API, config, database)

Examples

Example 1: Full project scan

Input: /code-security Process: Scans entire project, finds 3 HIGH issues in auth module, 2 MEDIUM in config, 1 FUN easter egg Output: Severity-ranked report with file:line references

Example 2: Scoped scan

Input: /code-security src/auth/ Process: Deep scan of auth directory only Output: Focused report on auth-related findings

Example 3: Clean project

Input: /code-security Output: "TREASURES — acme-api — 0 critical/high findings. 2 LOW items (stale TODOs). Looking solid."

Keep looking

Skills are one crate of 328,083. Ordering is by how many stacks a row turns up in, so the top of any crate is what has actually been picked rather than what has the most stars.