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 instructions/ehmo/platform-design-skills/agents-mdgit clone --depth 1 https://github.com/ehmo/platform-design-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/instructions/ehmo/platform-design-skills/agents-md)<a href="https://agentmods.dev/instructions/ehmo/platform-design-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/ehmo/platform-design-skills/agents-md.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 | $0.00215 | $0.00215 |
| Opus 5 | $0.00108 | $0.00108 |
| Sonnet 5 | $0.00043 | $0.00043 |
| Haiku 4.5 | $0.00021 | $0.00021 |
Grade A, and why
platform-design-skills AGENTS.md 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 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.
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.
What it actually says
Platform Design Skills
Agent skills for building and evaluating apps against official platform design guidelines.
Each skill in skills/ follows the Agent Skills format:
SKILL.md— Full guidelines with YAML frontmattermetadata.json— Version, references, abstractrules/— Contains_sections.md, a rule index/overview grouping all rules by category with IDsAGENTS.md— Quick agent context
Platforms
| Skill | Platform | Source |
|---|---|---|
ios |
iPhone | Apple HIG |
ipados |
iPad | Apple HIG |
macos |
Mac | Apple HIG |
watchos |
Apple Watch | Apple HIG |
visionos |
Apple Vision Pro | Apple HIG |
tvos |
Apple TV | Apple HIG |
android |
Android | Material Design 3 |
web |
Web | WCAG 2.2 + MDN |
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 · 23 lines · 215 tokens per session scan A 0077afd90a97
platform-design-skills AGENTS.md is an instructions file published in the GitHub repository ehmo/platform-design-skills (520 stars, last pushed 5mo ago), licensed MIT. It adds 215 tokens to every session, about $0.0011 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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