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/mamamou/ai-coding-skills/secure-by-design-codingnpx skills add mamamou/ai-coding-skills --skill secure-by-design-codinggit clone --depth 1 https://github.com/mamamou/ai-coding-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/mamamou/ai-coding-skills/secure-by-design-coding)<a href="https://agentmods.dev/skills/mamamou/ai-coding-skills/secure-by-design-coding"><img src="https://agentmods.dev/badge/skills/mamamou/ai-coding-skills/secure-by-design-coding.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 5.1 | $0.00205 | $0.07760 |
| Opus 5 | $0.00102 | $0.03880 |
| Sonnet 5 | $0.00041 | $0.01552 |
| Haiku 4.5 | $0.00020 | $0.00776 |
Grade C, and why
secure-by-design-coding scanned grade C with 4 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.
Strips warnings and disclaimerslowAnti-refusal
Omitting safety caveats hides risk from the user and is a common jailbreak preamble.
- **Explain the why once** — when applying a security pattern, briefly explain why (one line). Don't lecture. Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Asks for rootlowPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
- Never run as root in containers Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Cloud metadata endpointmediumServer-side request forgery
One request to 169.254.169.254 can return temporary IAM credentials.
response = requests.get(url) # attacker: http://169.254.169.254/latest/meta-data/ Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
response = requests.get(url) # attacker: http://169.254.169.254/latest/meta-data/ The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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 · 891 lines · 205 tokens per session scan C da23aa605ab8
secure-by-design-coding is a skill published in the GitHub repository mamamou/ai-coding-skills (16 stars, last pushed 2mo ago), with no licence file. It adds 205 tokens to every session and 7,760 once invoked, about $0.0010 per session on Opus 5. A static security scan graded it C with 4 findings (strips warnings and disclaimers, asks for root, cloud metadata endpoint). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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