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/jotjunior/cstk/owasp-securitynpx skills add JotJunior/cstk --skill owasp-securitygit clone --depth 1 https://github.com/JotJunior/cstkWrote 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/jotjunior/cstk/owasp-security)<a href="https://agentmods.dev/skills/jotjunior/cstk/owasp-security"><img src="https://agentmods.dev/badge/skills/jotjunior/cstk/owasp-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 | $0.00109 | $0.06811 |
| Opus 5 | $0.00055 | $0.03406 |
| Sonnet 5 | $0.00022 | $0.01362 |
| Haiku 4.5 | $0.00011 | $0.00681 |
Grade A, and why
owasp-security scanned grade A with 2 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 5d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
6. **Standard Library:** Historic CVEs in std libs (Python urllib, Java XML, Ruby OpenSSL). Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
os.system(f"convert {filename} output.png") How it starts
The opening of the file, as written. The whole thing — 678 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OWASP Security Best Practices Skill
Apply these security standards when writing or reviewing code.
Scope & limits. This skill is a checklist-guided review assistant over the standards below — useful for sweeping a diff or PR and surfacing high-signal findings. It is not, and does not replace, a formal audit, pentest, or certification: the breadth of the catalog (10+ frameworks) means checklist coverage, not exhaustive verification. Use it to raise the security floor and to prioritize; treat findings as starting points, not verdicts.
Deep references
This file is the operational entry point — quick checklists and code patterns. For deep coverage of any topic below, open the matching file in references/:
| Topic | File |
|---|---|
| LLM Top 10:2025 + Agentic 2026 deep dive + MCP security + modern prompt injection + MAESTRO | references/llm-agentic.md |
| OWASP API Security Top 10:2023 + OWASP CI/CD Top 10 (PPE, OIDC federation, signing) | references/api-cicd.md |
| NIST SP 800-63B-4 + WebAuthn/Passkeys + OAuth 2.1 + FAPI 2.0 | references/auth-modern.md |
| Post-quantum crypto (FIPS 203/204/205) + crypto agility + 2026 secrets management | references/crypto-modern.md |
| CWE Top 25:2025 + Mobile Top 10:2024 + Kubernetes/Docker Top 10 + EU AI Act mapping | references/extras.md |
The full historical reference document with deeper background on Top 10:2025, ASVS 5.0, and Agentic 2026 is in OWASP-2025-2026-Report.md.
Quick Reference: OWASP Top 10:2025
| # | Vulnerability | Key Prevention |
|---|---|---|
| A01 | Broken Access Control | Deny by default, enforce server-side, verify ownership |
| A02 | Security Misconfiguration | Harden configs, disable defaults, minimize features |
| A03 | Supply Chain Failures | Lock versions, verify integrity, audit dependencies |
| A04 | Cryptographic Failures | TLS 1.2+, AES-256-GCM, Argon2/bcrypt for passwords |
| A05 | Injection | Parameterized queries, input validation, safe APIs |
| A06 | Insecure Design | Threat model, rate limit, design security controls |
| A07 | Auth Failures | MFA, check breached passwords, secure sessions |
| A08 | Integrity Failures | Sign packages, SRI for CDN, safe serialization |
| A09 | Logging Failures | Log security events, structured format, alerting |
| A10 | Exception Handling | Fail-closed, hide internals, log with context |
What ships with it
7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago First seen · 678 lines · 109 tokens per session scan A 3eddd13f2180
owasp-security is a skill published in the GitHub repository JotJunior/cstk (23 stars, last pushed yesterday), licensed MIT. It adds 109 tokens to every session and 6,811 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 2 findings (makes network calls, 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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