A local messaging tool for sending messages between AI coding sessions running at the same time, even in different clients. It uses MCP, a standard way for AI tools to communicate with external services.

Use it to coordinate parallel AI coding sessions, pass updates between agents, and share work across supported clients.

It lets separate coding sessions share information without setting up a separate messaging service or other infrastructure.

yaac — Plugin by amyodov

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 amyodov/yet-another-agentic-chat

agentmods

npx agentmods add plugins/amyodov/yet-another-agentic-chat/plugin

Clone the repo

git clone --depth 1 https://github.com/amyodov/yet-another-agentic-chat

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

yaac 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 yesterday.

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.

plugin/.claude-plugin/plugin.json · 21 lines

What it actually says

{
  "name": "yaac",
  "displayName": "YAAC",
  "version": "0.5.2",
  "description": "Messaging between concurrent AI coding sessions, across clients, over MCP. Zero infrastructure. (YAAC: Yet Another Agentic Chat.)",
  "author": {
    "name": "Alex Myodov",
    "email": "[email protected]"
  },
  "homepage": "https://github.com/amyodov/yet-another-agentic-chat",
  "repository": "https://github.com/amyodov/yet-another-agentic-chat",
  "license": "MIT",
  "keywords": [
    "mcp",
    "chat",
    "messaging",
    "agents",
    "zeromq"
  ]
}

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.

yesterday First seen · 21 lines scan A 219dacebeef8

Subscribe to this mod's changes

yaac is a plugin published in the GitHub repository amyodov/yet-another-agentic-chat (4 stars, last pushed 2d 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.

agent-communication agent-orchestration agents ai-agents communication mcp

yaac

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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