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.
npx agentmods add skills/davidmatousek/tachi/securitynpx skills add davidmatousek/tachi --skill securitygit clone --depth 1 https://github.com/davidmatousek/tachiWrote 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.
[](https://agentmods.dev/skills/davidmatousek/tachi/security)<a href="https://agentmods.dev/skills/davidmatousek/tachi/security"><img src="https://agentmods.dev/badge/skills/davidmatousek/tachi/security.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00165 | $0.08338 |
| Opus 5 | $0.00082 | $0.04169 |
| Sonnet 5 | $0.00033 | $0.01668 |
| Haiku 4.5 | $0.00016 | $0.00834 |
Grade A, and why
security scanned grade A 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 3d 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
- Command Injection: `os.system(var)`, `subprocess.call(f"cmd {var}")`, `exec(user_input)` Copies of this mod
1 near-identical copy found in the catalogue:
- security — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 818 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/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.
Step 0: Parse Arguments
If invoked standalone, parse optional flags from arguments:
-
--no-security: If present (standalone invocation context), output "Security scan skipped (--no-security)" and exit cleanly. This flag is normally handled by/aod.buildStep 0 before invoking this skill; if present here in standalone mode, honor it. -
Feature number extraction: Detect current feature number from branch name (
git branch --show-current→ extract leading digits) or fromspecs/*/directory listing. Used for output path resolution. -
Output path resolution:
- If inside an AOD project (
specs/{NNN}-*/exists): writesecurity-scan.mdtospecs/{NNN}-*/security-scan.md - Otherwise: write
security-scan.mdto current working directory
- If inside an AOD project (
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.
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.
- 3d ago First seen · 818 lines · 165 tokens per session scan A c4e86f44ad04
security is a skill published in the GitHub repository davidmatousek/tachi (90 stars, last pushed 21d ago), licensed Apache-2.0. It adds 165 tokens to every session and 8,338 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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