What is platform-design-skills AGENTS.md?

A collection of design-review and development guidelines for Apple platforms, Android, and the web, based on official platform standards.

It supports building and evaluating interfaces for iPhone, iPad, Mac, Apple Watch, Apple Vision Pro, Apple TV, Android, and websites.

It helps developers check whether an app follows the conventions and accessibility expectations of its target platform.

How ehmo/platform-design-skills configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to ehmo/platform-design-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/ehmo/platform-design-skills/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/ehmo/platform-design-skills

Made for: Codex, OpenCode.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/ehmo/platform-design-skills/agents-md/github.svg)](https://agentmods.dev/instructions/ehmo/platform-design-skills/agents-md)

Your own site

<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/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.

Your own site · 80×15

<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="Reviewed on agentmods" width="80" height="20"></a>

Per session 215 This file is loaded in full into every session.

When invoked 215 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00215	$0.00215
Opus 5.5	$0.00086	$0.00086
Sonnet 5.5	$0.00043	$0.00043
Haiku 4.5	$0.00021	$0.00021

Measured 2mo ago against content hash 0077afd90a97, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo 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.

AGENTS.md · 23 lines

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 frontmatter
metadata.json — Version, references, abstract
rules/ — Contains _sections.md, a rule index/overview grouping all rules by category with IDs
AGENTS.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

Changes

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.

2mo ago First seen · 23 lines · 215 tokens per session scan A 0077afd90a97

Subscribe to this mod's changes

platform-design-skills AGENTS.md is an instructions file published in the GitHub repository ehmo/platform-design-skills (638 stars, last pushed 7mo ago), licensed MIT. It adds 215 tokens to every session, about $0.0009 per session on Opus 5.5. 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.

Design and UX

platform-design-skills AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
platform-design-skills AGENTS.mdehmo/platform-design-skills	Instructions file	638	7mo ago	MIT	A	215	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

platform-design-skills: Instructions file for Codex