tachi: Skill for Claude Code

/security — SAST/SCA Security Scan

Purpose: Analyze code files and dependency manifests changed on the feature branch for OWASP Top 10 vulnerabilities and known CVE patterns. Write permanent audit artifacts. Block on CRITICAL/HIGH findings until acknowledged or fixed.

When invoked from /aod.build: Called as the Security Scan step (Step 7) via the Skill tool. --no-security flag in /aod.build bypasses this skill entirely.

When invoked standalone: Run directly as /security from any project directory. security-scan.md is written to specs/{NNN}-*/ if inside an AOD project, or to the current working directory otherwise.

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Step 0: Parse Arguments

If invoked standalone, parse optional flags from arguments:

1. --no-security: If present (standalone invocation context), output "Security scan skipped (--no-security)" and exit cleanly. This flag is normally handled by /aod.build Step 0 before invoking this skill; if present here in standalone mode, honor it.

2. Feature number extraction: Detect current feature number from branch name (git branch --show-current → extract leading digits) or from specs/*/ directory listing. Used for output path resolution.

3. Output path resolution:

   • If inside an AOD project (specs/{NNN}-*/ exists): write security-scan.md to specs/{NNN}-*/security-scan.md
   • Otherwise: write security-scan.md to current working directory

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Step 1: File Detection

Detect all files changed on the feature branch relative to main.

1a: SAST File Detection (FR-004)

Run: git diff --name-only main...HEAD

Filter the output to code files by including only these extensions: .py .js .ts .jsx .tsx .sh .go .rs .java .rb .swift .kt .php .cs .cpp .c .h

Exclude these patterns from the result:

• Generated files: *.lock, *.min.js, *.min.css, *.map, *.generated.*
• Directories: vendor/, dist/, build/, node_modules/, .aod/, docs/

Store result as code_files list. Count as code_file_count.