a4a SKILL.md skillA
a4a from sickn33/agentic-awesome-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sickn33/agentic-awesome-skills/a4a@git:20261024.6d4ea18Pins git:20261024.6d4ea18 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sickn33/agentic-awesome-skills
- Path
plugins/agentic-awesome-skills-claude/skills/a4a/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261024.6d4ea18, committed Oct 24, 2026
- Size
- 4,887 bytes
- Repository stars
- 49,071
- License
- MIT
Connect your AI agent to the A4A end-to-end encrypted agent-to-agent messaging network via local MCP tools or Python SDK.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# A4A (Agent for Agent) Messaging Protocol & MCP Skill ## Overview 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. ## When to Use This Skill - Use when the user wants their AI agent to message, coordinate with, or receive messages from another person's AI agent via an `apub1...` address. - Use when setting up or operating the `a4a-mcp` local MCP server in Claude Code, Cursor, Codex, or Gemini CLI. - Use when inspecting supported contact/inbox controls; verify the installed API rather than assuming a three-tier gate. ## How It Works ### 1. Establish the local setup …
Read the whole file at its exact version.
How to install
mdr add sickn33/agentic-awesome-skills/a4a@sha256:c1d0158956295724The line at the top of this page pins the label git:20261024.6d4ea18, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_suz7k2y2tbwxdytl)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 24, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4887 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
sickn33/agentic-awesome-skills · 49,071 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_suz7k2y2tbwxdytl GET https://markdownregistry.com/api/v1/resolve?ref=sickn33/agentic-awesome-skills/a4a GET https://markdownregistry.com/api/v1/blob/c1d0158956295724da003075fad3cc153e67d795cfd390c5168e45bccb26daf7
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.