A communication add-on that lets separate Gemini CLI sub-agents exchange messages in real time. Sub-agents are smaller assistant processes working on parts of a larger task.

Use it when coordinating Gemini CLI sub-agents that need to pass updates or findings to one another during a task.

It helps multiple agents share information while they work instead of operating as isolated processes.

agent-relay — Plugin for Gemini CLI by AgentWorkforce/relay

About the project

Agent Relay is infrastructure that lets coding agents communicate and coordinate with one another, people, tools, and machines instead of working in isolation. Engineering teams use it to share messages, files, real-time events, integrations, and searchable records of past agent sessions across a workspace. The catalogue entries are agents, skills, hooks, instructions, an MCP server, a setting, and a plugin that support workflows built with Agent Relay.

AgentWorkforce/relay · 1,094 stars · on GitHub · agentrelay.com

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.

Clone the repo

git clone --depth 1 https://github.com/AgentWorkforce/relay

Made for: Gemini CLI.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/agentworkforce/relay/gemini-relay-extension/github.svg)](https://agentmods.dev/plugins/agentworkforce/relay/gemini-relay-extension)

Your own site

<a href="https://agentmods.dev/plugins/agentworkforce/relay/gemini-relay-extension"><img src="https://agentmods.dev/badge/plugins/agentworkforce/relay/gemini-relay-extension/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/agentworkforce/relay/gemini-relay-extension"><img src="https://agentmods.dev/badge/plugins/agentworkforce/relay/gemini-relay-extension.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

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. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

agent-relay 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 2mo ago.

The scan reads gemini-extension.json. This mod also ships 8 executable files (hooks/after-agent-inbox.sh, hooks/after-tool-inbox.sh, hooks/before-model-inject.sh, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

plugins/gemini-relay-extension/gemini-extension.json · 26 lines

What it actually says

{
  "name": "agent-relay",
  "version": "0.1.0",
  "description": "Lets your Gemini CLI sub-agents communicate with each other in real time",
  "contextFileName": "GEMINI.md",
  "mcpServers": {
    "agent-relay": {
      "command": "node",
      "args": ["${extensionPath}${/}relay-server.js"],
      "cwd": "${extensionPath}"
    }
  },
  "permissions": {
    "autoApprove": [
      {
        "toolName": "agent-relay.*",
        "reason": "Allow real-time agent-to-agent communication"
      },
      {
        "toolName": "mcp_agent_relay_*",
        "reason": "Allow real-time agent-to-agent communication (compat)"
      }
    ]
  }
}

Files

What ships with it

19 files beside gemini-extension.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.

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.

2mo ago First seen · 26 lines scan A 670c78c111d5

Subscribe to this mod's changes

agent-relay is a plugin published in the GitHub repository AgentWorkforce/relay (1,094 stars, last pushed yesterday), licensed Apache-2.0. 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 2026-09-06.

Building agents agent agent-collaboration agent-communication agentic-ai agents real-time

agent-relay next to 6 plugins from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
agent-relayAgentWorkforce/relay	Plugin	1.1k	yesterday	Apache-2.0	A	—	Gemini CLI
adealvin-reyes/better-agentic-ide	Plugin	45	2d ago	MIT	A	—	Claude Code
humanizerblader/humanizer	Plugin	65k	9d ago	MIT	A	—	Claude Code
claude-plugins-official marketplaceanthropics/claude-plugins-official	Plugin	46k	yesterday	Apache-2.0	A	—	Claude Code
nextjsvercel/next.js	Plugin	143k	yesterday	MIT	A	—	Claude Code
themes-examplegoogle-gemini/gemini-cli	Plugin	109k	yesterday	Apache-2.0	A	—	Gemini CLI
knowledge-work-plugins marketplaceanthropics/knowledge-work-plugins	Plugin	35k	2d ago	Apache-2.0	A	—	Claude Code