a2a-protocol SKILL.md skillA
a2a-protocol from akillness/jeo-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add akillness/jeo-skills/a2a-protocol@git:20260920.2a2b733Pins git:20260920.2a2b733 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- akillness/jeo-skills
- Path
.agent-skills/a2a-protocol/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260920.2a2b733, committed Sep 20, 2026
- First version recorded
- Sep 19, 2026
- Size
- 3,869 bytes
- Repository stars
- 52
- License
- none declared
Agent-to-Agent horizontal messaging — Linux Foundation AAIF 2026 standard. Use when multiple agents across systems/vendors need to exchange tasks, results, or capabilities without sharing a runtime.
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
# A2A Protocol
## Overview
MCP exposes *tools* to an agent. A2A connects *agents* to *agents*. The 2026 Linux Foundation AAIF specification standardizes capability cards, task envelopes, and the negotiation handshake — so a Claude agent can hand work to a Codex agent (or a third-party vendor agent) without bespoke glue.
## When to use
- Two agents need to collaborate across runtime/vendor boundaries
- You're tired of writing custom HTTP wrappers between agent systems
- Cross-org agent collaboration (your billing agent ↔ vendor support agent)
- Mesh / federated agent systems
## Don't use when
- Both agents share a runtime (just call a function or use orchestrator)
- One-direction tool call → use MCP (`mcp-builder`)
## Core concepts
| Concept | What |
|---------|------|
| **Agent Card** | Public manifest — capabilities, endpoint, auth, SLAs |
| **Task Envelope** | Job description + inputs + budget + deadline |
| **Artifact** | Typed output a task produces |
| **Stream** | Long-running task progress channel (SSE) |
| **Negotiation** | Optional capability/SLA agreement before send |
## Agent Card example
```json
{
"name": "acme-research-agent",
"version": "0.4.1",
…Read the whole file at its exact version.
How to install
mdr add akillness/jeo-skills/a2a-protocol@sha256:afc69c4bc714498fThe line at the top of this page pins the label git:20260920.2a2b733, 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_h5vkonft2muqlkl7)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Sep 19, 2026 and Sep 20, 2026, about one every day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260920.2a2b733 latest | 2026-09-20 | 2a2b733 | 3,869 B | A | view · diff |
| git:20260919.9f2a908 | 2026-09-19 | 9f2a908 | 3,875 B | A | view |
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 (3869 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
akillness/jeo-skills · 52 stars · license none declared · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_h5vkonft2muqlkl7 GET https://markdownregistry.com/api/v1/resolve?ref=akillness/jeo-skills/a2a-protocol GET https://markdownregistry.com/api/v1/blob/afc69c4bc714498facb8fba69fdf5802869981f12f2f49438d23924f4b0b057f
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.