A2a Gateway

Organization

opencrabs

a2a-gateway

Agent-to-Agent (A2A) protocol gateway reference. JSON-RPC 2.0 peer-to-peer agent communication. (/a2a-gateway, a2a, agent protocol)

Overview

Publisher	opencrabs
Repository	`opencrabs`
Skill name	`a2a-gateway`
Stars	981
Forks	105
Bundled files	Instructions only
License	MIT
Links	Skill source Repository Homepage

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
Self-contained
Everything the model needs lives in the instructions — no extra files to sync.
Open source
Published by opencrabs on GitHub. Read the source before you install it.

Installation

Install the A2a Gateway AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/opencrabs/opencrabs/tree/main/src/docs/reference/templates/skills/a2a-gateway
Enable the skill in any chat where you want it available.

Store

Installed

Skills

Add skills

Import one or more skills from a public GitHub folder or a local .skill or .zip archive, or SKILL.md file.

From GitHub URLFrom .skill, .zip, or SKILL.md

GitHub repo or folder

https://github.com/opencrabs/opencrabs/tree/main/src/docs/reference/templates/skills/a2a-gateway

Points to a single skill folder, or any folder that contains multiple skills. Public repos only.

CancelContinue

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/opencrabs/opencrabs.git /tmp/opencrabs
mkdir -p .claude/skills
cp -r /tmp/opencrabs/src/docs/reference/templates/skills/a2a-gateway .claude/skills/a2a-gateway

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable A2a Gateway in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads A2a Gateway on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so A2a Gateway is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

A2A Gateway Reference

OpenCrabs exposes an A2A Protocol HTTP gateway for peer-to-peer agent communication.

What it does

Other A2A-compatible agents send tasks via JSON-RPC 2.0. OpenCrabs processes them using its full tool suite and returns results.

Endpoints

GET /.well-known/agent.json — Agent Card discovery (skills, capabilities)
POST /a2a/v1 — JSON-RPC 2.0 (message/send, tasks/get, tasks/cancel)
GET /a2a/health — Health check

Setup

Enable in ~/.opencrabs/config.toml:

toml
[a2a]
enabled = true
bind = "127.0.0.1"
port = 18790

Bee Colony Debate

Multi-agent structured debate with knowledge-enriched context from QMD memory search. Configurable rounds, confidence-weighted consensus based on ReConcile (ACL 2024).

Tool: a2a_send

Param	Required	What
`action`	Yes	`discover`, `send`, `get`, `cancel`
`url`	Yes	Base URL of remote agent (e.g. http://127.0.0.1:18790)
`message`	For `send`	Text to send
`task_id`	For `get`/`cancel`	Task ID to check/cancel
`context_id`	Optional	Continue a conversation
`api_key`	Optional	Bearer token for authenticated endpoints

Frequently asked questions

What does the A2a Gateway AI skill do?

Agent-to-Agent (A2A) protocol gateway reference. JSON-RPC 2.0 peer-to-peer agent communication. (/a2a-gateway, a2a, agent protocol)

Why use A2a Gateway on TypingMind?

Because you install it once and use it with any model. A2a Gateway is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install A2a Gateway in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/opencrabs/opencrabs/tree/main/src/docs/reference/templates/skills/a2a-gateway. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use A2a Gateway?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with A2a Gateway?

As many as you like. As long as a model supports skills, you can use A2a Gateway with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the A2a Gateway AI skill free?

Yes. It is published on GitHub by opencrabs under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Instructions

View

Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

A2A Gateway Reference

What it does

Endpoints

Setup

Bee Colony Debate

Tool: a2a_send

Frequently asked questions

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