What files are required for a Claude Code plugin?

Claude Code requires a marketplace.json to index plugins and a plugin.json manifest located within the .claude-plugin directory.

What is the Agent Skills specification?

It is a standardized format using Markdown and frontmatter to define AI capabilities that work across different agent platforms like Claude Code and Pi.

Can I use one skill for both Claude Code and Pi?

Yes, by following this authoring guide, you can structure your files so a single SKILL.md file serves multiple platforms with zero duplication.

How do I test my custom skill locally?

You can test locally by running 'claude --plugin-dir .' for Claude Code or 'pi --skill ./path/to/skill' for the Pi agent.

Cross-Platform Skill Authoring

Name: Cross-Platform Skill Authoring
Author: circlesac

bycirclesac

0•

Developer Tools

Standardizes the creation and management of AI agent skill packages compatible with Claude Code, Pi, and OpenClaw.

This skill provides a comprehensive framework and set of best practices for developers looking to build portable agent capabilities. By following the Agent Skills specification, authors can write their logic once in a SKILL.md file and deploy it across multiple AI coding platforms with zero duplication. It guides users through repository structuring, manifest configuration for marketplace discovery, and platform-specific packaging requirements, ensuring that custom AI tools are easily installable and maintainable across the emerging agent ecosystem.

Key Features

01Seamless integration with Pi and OpenClaw via package.json mapping

020 GitHub stars

03Automated configuration for marketplace.json and plugin.json manifests

04Universal SKILL.md frontmatter support following the Agent Skills specification

05Standardized slash command invocation across different agent platforms

06Support for multi-plugin monorepos with independent installation paths

Use Cases

01Managing a repository containing multiple independently toggleable agent capabilities

02Creating a single skill package that works natively in both Claude Code and Pi

03Restructuring existing developer utilities into discoverable AI agent plugins

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add circlesac/skills authoring

For use in Claude.ai and ChatGPT

Download Skill