agent-platforms

agent-platforms is a skill for Claude Code, Codex from gmh5225/awesome-skills. It costs 33 tokens per session (769 once invoked), scanned A, original, MIT.

A guide to making Skills work across different AI coding assistants, including Claude Code, Codex, Gemini CLI, Cursor, and GitHub Copilot. It compares the folders and file conventions each assistant uses.

In plain words
What is it for?
Use it to check platform compatibility, choose project or user installation paths, and convert Skills between supported agents.
Why use it?
It removes uncertainty when the same Skill needs to be installed or adapted for more than one coding assistant.

Skill for Claude CodeCodex

Written for Claude Code and Codex: installed under .claude/, but also reads ~/.codex or $CODEX_HOME. Also seen: reads .claude/ paths; mentions Claude Code; mentions Codex.

Good fit Use it to check platform compatibility, choose project or user installation paths, and convert Skills between supported agents.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/gmh5225/awesome-skills/platforms
Install

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.

Any agent
npx skills add gmh5225/awesome-skills --skill platforms
Clone the repo
git clone --depth 1 https://github.com/gmh5225/awesome-skills

Made for: Claude Code, Codex.

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.

agentmods badge for agent-platforms

README.md
[![agentmods](https://agentmods.dev/badge/skills/gmh5225/awesome-skills/platforms/github.svg)](https://agentmods.dev/skills/gmh5225/awesome-skills/platforms)
Your own site
<a href="https://agentmods.dev/skills/gmh5225/awesome-skills/platforms"><img src="https://agentmods.dev/badge/skills/gmh5225/awesome-skills/platforms/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.

agentmods 80×15 button for agent-platforms

Your own site · 80×15
<a href="https://agentmods.dev/skills/gmh5225/awesome-skills/platforms"><img src="https://agentmods.dev/badge/skills/gmh5225/awesome-skills/platforms.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 769 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Agent Snooping · line 71
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
How audits are shown
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00033 $0.00769
Opus 5 $0.00016 $0.00385
Sonnet 5 $0.00007 $0.00154
Haiku 4.5 $0.00003 $0.00077

Measured 10d ago against content hash 7e2d71824911, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

agent-platforms 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 10d 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.

.claude/skills/platforms/SKILL.md · 89 lines

How it starts

The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Multi-Platform Agent Skills

Scope

Use this skill when:

  • Ensuring skills work across multiple platforms
  • Understanding platform-specific conventions
  • Converting skills between platforms

Platform Compatibility Matrix

Platform Skill Format Project Path Global Path
Amp SKILL.md .agents/skills/ ~/.config/agents/skills/
Antigravity SKILL.md .agent/skills/ ~/.gemini/antigravity/skills/
Claude Code SKILL.md .claude/skills/ ~/.claude/skills/
Codex SKILL.md .codex/skills/ ~/.codex/skills/
Cursor SKILL.md .cursor/skills/ ~/.cursor/skills/
Gemini CLI SKILL.md .gemini/skills/ ~/.gemini/skills/
GitHub Copilot SKILL.md .github/skills/ ~/.copilot/skills/
Goose SKILL.md .goose/skills/ ~/.config/goose/skills/
OpenCode SKILL.md .opencode/skills/ ~/.config/opencode/skills/
Windsurf SKILL.md .windsurf/skills/ ~/.codeium/windsurf/skills/

Universal SKILL.md Format

All platforms use YAML frontmatter:

---
name: skill-name
description: When to use this skill
---

# Instructions here...

Cross-Platform Installation

Most tools auto-discover skills in .agent/skills/:

# Universal installation (works with most tools)
git clone https://github.com/user/skills .agent/skills

Platform-Specific Notes

Claude Code

  • Auto-discovers from .claude/skills/ and ~/.claude/skills/
  • Supports /init command for context bootstrapping

Codex (OpenAI)

  • Supports multiple scopes: REPO, USER, ADMIN, SYSTEM
  • Built-in $skill-creator and $skill-installer
  • Restart required after installing new skills

GitHub Copilot

  • Skills in .github/skills/ directory
  • Uses SKILL.md with name and description required
  • Copilot auto-activates based on description match

Gemini CLI

  • Use @ symbol to attach skill files to prompts
  • Place skills in .gemini/skills/ or .agent/skills/

Read the full file on GitHub · 89 lines

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.

  1. 10d ago First seen · 89 lines · 33 tokens per session scan A 7e2d71824911

Subscribe to this mod's changes

agent-platforms is a skill published in the GitHub repository gmh5225/awesome-skills (48 stars, last pushed 2d ago), licensed MIT. It adds 33 tokens to every session and 769 once invoked, about $0.0002 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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