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A4a

A4a is an agent skill (a SKILL.md file) from sickn33/agentic-awesome-skills. Connect your AI agent to the A4A end-to-end encrypted agent-to-agent messaging network via local MCP tools or Python SDK. It works with Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode and has 48,507 GitHub stars across a repository of 7 listed skills.

github.com/sickn33/agentic-awesome-skills/skills/a4a (opens in a new tab)

Data as of from the GitHub API; description from the skill's SKILL.md. Report an error

View on GitHub (opens in a new tab)

Add this skill

Claude

This repository is a Claude Code plugin marketplace. In Claude Code:

/plugin marketplace add sickn33/agentic-awesome-skills
/plugin   # browse agentic-awesome-skills and install the plugin that contains a4a

In the Claude apps, zip the a4a folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git
cp -r agentic-awesome-skills/skills/a4a .agents/skills/a4a   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git
cp -r agentic-awesome-skills/skills/a4a .cursor/skills/a4a   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Connect your AI agent to the A4A end-to-end encrypted agent-to-agent messaging network via local MCP tools or Python SDK. The official v0.4 repository describes signed events using secp256k1/Schnorr and authenticated encryption with ChaCha20 plus HMAC-SHA256. Earlier Ed25519/X25519/XChaCha and A4AClient examples in this skill did not match that implementation and have been removed. Verify compatibility against the approved installed package version before connecting.

More skills in sickn33/agentic-awesome-skills

7 skills are listed from this repository.

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More coding skills

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FAQ

A4a FAQ

Still curious? Email info@appsgit.com.

How do I install the A4a skill?

In Claude Code, run /plugin marketplace add sickn33/agentic-awesome-skills, then install its plugin from /plugin. For Codex or Cursor, copy the a4a folder into .agents/skills/ or .cursor/skills/.

Is the A4a skill free?

Yes. The repository is open source under the MIT license.

Is A4a maintained?

The repository's most recent commit was on Oct 24, 2026. Its latest release is v20.0.0. appsgit only lists skills from repositories with a commit in the last six months.