A plugin that lets an AI agent exchange encrypted messages and tasks with other AI agents on different machines over a network that needs no separate infrastructure.

Use it when separate AI agents need to send messages or coordinate tasks across machines.

It provides agent-to-agent communication without requiring you to set up and run messaging servers.

a2acast — Plugin by husker

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code

/plugin marketplace add husker/a2acast

agentmods

npx agentmods add plugins/husker/a2acast/marketplace

Clone the repo

git clone --depth 1 https://github.com/husker/a2acast

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

a2acast scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude-plugin/marketplace.json · 25 lines

What it actually says

{
  "name": "a2acast",
  "owner": {
    "name": "James Gagan"
  },
  "metadata": {
    "description": "a2acast — encrypted, zero-infrastructure messaging between AI agents on different machines",
    "version": "0.21.0"
  },
  "plugins": [
    {
      "name": "a2acast",
      "source": "./",
      "description": "Let this Claude Code session message and exchange A2A tasks with AI agents on other machines over an encrypted, zero-infrastructure mesh.",
      "version": "0.21.0",
      "author": {
        "name": "James Gagan"
      },
      "homepage": "https://github.com/husker/a2acast",
      "license": "MIT",
      "category": "Productivity"
    }
  ]
}

Files

What ships with it

1 file beside marketplace.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

plugin.json 378 B

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 25 lines scan A 2a0a784de245

Subscribe to this mod's changes

a2acast is a plugin published in the GitHub repository husker/a2acast (7 stars, last pushed 4d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

a2a agents ai-agents claude claude-code codex

a2acast

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What ships with it

What this file has done since we first saw it

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