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 skills add scholarly360/owasp-top10-web-skills --skill insecure-designgit clone --depth 1 https://github.com/scholarly360/owasp-top10-web-skillsWrote 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/scholarly360/owasp-top10-web-skills/insecure-design)<a href="https://agentmods.dev/skills/scholarly360/owasp-top10-web-skills/insecure-design"><img src="https://agentmods.dev/badge/skills/scholarly360/owasp-top10-web-skills/insecure-design/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.
<a href="https://agentmods.dev/skills/scholarly360/owasp-top10-web-skills/insecure-design"><img src="https://agentmods.dev/badge/skills/scholarly360/owasp-top10-web-skills/insecure-design.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00161 | $0.02131 |
| Opus 5 | $0.00081 | $0.01066 |
| Sonnet 5 | $0.00032 | $0.00426 |
| Haiku 4.5 | $0.00016 | $0.00213 |
Grade A, and why
insecure-design 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 244 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OWASP A06:2025 — Insecure Design
What This Skill Does
Guides detection, analysis, and remediation of Insecure Design vulnerabilities — architecture-level failures where security controls are absent or structurally inadequate. Unlike implementation bugs, insecure design cannot be fixed by patching code alone; it requires redesigning the flow or adding missing control layers.
OWASP 2025 position: #6 (down from #4 in 2021, as threat modeling adoption has improved)
CWEs covered: 39 | Avg incidence: 1.86%
Key CWEs: CWE-434, CWE-269, CWE-362, CWE-799, CWE-602
Core Concepts
Design vs. Implementation
| Insecure Design (A06) | Implementation Bug (other categories) |
|---|---|
| Rate limiting never architected into login flow | Rate limiter present but misconfigured |
| File upload stored in web root by design | Upload handler missing extension check |
| No tenant isolation in multi-tenant DB schema | Query missing WHERE clause |
| Business logic allows negative quantities | Missing server-side input validation |
A design flaw requires adding a new control or refactoring the architecture, not just patching existing code.
Testing Checklist for FastAPI / Flask
1. Rate Limiting (CWE-799)
Verify that login, registration, password reset, and high-value transaction endpoints enforce rate limits.
FastAPI — SlowAPI:
from slowapi import Limiter
from slowapi.util import get_remote_address
limiter = Limiter(key_func=get_remote_address)
@app.post("/login")
@limiter.limit("5/minute")
async def login(request: Request, ...): ...
Flask — Flask-Limiter:
from flask_limiter import Limiter
limiter = Limiter(app, key_func=get_remote_address)
@app.route("/login", methods=["POST"])
@limiter.limit("5 per minute")
def login(): ...
Red flags to flag in review:
- Login,
/register,/reset-password,/checkoutroutes with no rate-limiting decorator RATELIMIT_ENABLED = Falseor limiter initialized without being applied to sensitive routes- Rate limits too permissive (e.g.,
1000/minuteon auth endpoints)
What ships with it
2 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.
- 12d ago First seen · 244 lines · 161 tokens per session scan A 4b68d91daab4
insecure-design is a skill published in the GitHub repository scholarly360/owasp-top10-web-skills (22 stars, last pushed 5mo ago), licensed MIT. It adds 161 tokens to every session and 2,131 once invoked, about $0.0008 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 2026-08-30.
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