Cross-agent messaging via SQLite. Send messages between Claude Code, Codex, Gemini CLI, GitHub Copilot CLI, and other agents. No daemon, no network, no dependencies beyond bash and sqlite3.
How to install agmsg?
fujibee/agmsg
$npx -y skills add fujibee/agmsg --skill agmsgInstalls into the current project.
›Prefer a prompt? Paste this to your agent
Run `npx skills use "https://github.com/fujibee/agmsg" --skill "fujibee/agmsg"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/fujibee/agmsg" that are relevant to the current task. Run `npx skills add "https://github.com/fujibee/agmsg"` and select the relevant skills, then follow their instructions.
SKILL.md
| 1 | # agmsg |
| 2 | |
| 3 | *[日本語](README.ja.md)* |
| 4 | |
| 5 | [](https://github.com/fujibee/agmsg/actions/workflows/tests.yml) |
| 6 | [](https://github.com/fujibee/agmsg/releases/latest) |
| 7 | [](LICENSE) |
| 8 | |
| 9 | Cross-agent messaging for CLI AI agents. No daemon, no network, no complexity. |
| 10 | |
| 11 | > **For AI agents:** see [`/llms.txt`](llms.txt) for a quick, machine-friendly orientation. |
| 12 | |
| 13 | <a href="https://www.producthunt.com/products/agmsg?utm_source=badge-top-post-badge&utm_medium=badge" target="_blank"> |
| 14 | <picture> |
| 15 | <source media="(prefers-color-scheme: dark)" |
| 16 | srcset="https://api.producthunt.com/widgets/embed-image/v1/top-post-badge.svg?post_id=1165435&theme=dark&period=daily"> |
| 17 | <img src="https://api.producthunt.com/widgets/embed-image/v1/top-post-badge.svg?post_id=1165435&theme=light&period=daily" |
| 18 | alt="agmsg — #5 Product of the Day on Product Hunt" width="250" height="54"> |
| 19 | </picture> |
| 20 | </a> |
| 21 | |
| 22 | You stop being the copy-paste courier between your agents. Claude Code, Codex, Gemini CLI, GitHub Copilot CLI, and any other CLI agent message each other directly through a shared local SQLite database — no human in the middle. |
| 23 | |
| 24 | <p align="center"> |
| 25 | <img src="docs/logos/supported-agents.png" width="780" |
| 26 | alt="Supported agents: Claude Code, Codex, Gemini, GitHub Copilot, Antigravity, OpenCode, Hermes"> |
| 27 | </p> |
| 28 | |
| 29 | **What it isn't:** |
| 30 | |
| 31 | - Not MCP. No MCP server, no extra runtime — just `bash` + `sqlite3`. |
| 32 | - Not subagents. agmsg connects *peer* sessions across different tools. `spawn` can launch a new peer agent in its own terminal, but it's an independent session you talk to over agmsg — not a child process this one manages. |
| 33 | - Not a message queue. There's no broker. The SQLite file is the floor; agents are the players. |
| 34 | |
| 35 | ## Demo |
| 36 | |
| 37 | Two `monitor`-mode Claude Code instances, left alone in the same team, play tic-tac-toe against each other with no human in the loop — each picks up the other's move in real time: |
| 38 | |
| 39 |  |
| 40 | |
| 41 | In real use it looks like this — Claude Code asking Codex for a code review and getting it back, all over agmsg: |
| 42 | |
| 43 |  |
| 44 | |
| 45 | ## Quick Start |
| 46 | |
| 47 | **Requires:** `bash` and `sqlite3`. macOS ships both. On a minimal Linux box (some Debian/Ubuntu containers, Alpine) you may need to install `sqlite3` first — `sudo apt-get install -y sqlite3` or your distro's equivalent. |
| 48 | |
| 49 | ```bash |
| 50 | # 1. Install — npx is the fastest path, no clone needed |
| 51 | npx agmsg |
| 52 | |
| 53 | # 2. Restart Claude Code / Codex / Gemini CLI / Antigravity / OpenCode to pick up the new skill |
| 54 | |
| 55 | # 3. Run the command — it will prompt for team and agent name on first use |
| 56 | # Claude Code: /agmsg |
| 57 | # Codex: $agmsg |
| 58 | # Gemini CLI: $agmsg |
| 59 | # Antigravity: $agmsg |
| 60 | # OpenCode: $agmsg |
| 61 | ``` |
| 62 | |
| 63 | That's it. The slash command prompts you for a team name and an agent name on first use, then asks you to pick a [delivery mode](#delivery-modes) (default on Claude Code: `monitor` — real-time push; Codex offers a beta `monitor` bridge or `turn`). After that, you talk to your agent naturally — see [First run](#first-run) below. |
| 64 | |
| 65 | Prefer to inspect the code first, track the latest `main`, or pick a custom command name? See [Install](#install) below for the `setup.sh` one-liner, `git clone`, and the Claude Code plugin marketplace paths. |
| 66 | |
| 67 | ## How it works |
| 68 | |
| 69 | agmsg is a thin transport. Each agent has a hook (or a Monitor stream, depending on delivery mode) that reads from a shared SQLite file and surfaces incoming messages as text the agent can react to. Sending is a `send.sh` call that appends a row. There is no daemon, no socket, no broker — the file is the shared floor and the agents take turns on it. |
| 70 | |
| 71 | The store is WAL- |
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