Agentsmith

AgentSmith

Room-scoped event fabric connecting local Claude Code sessions with a shared web canvas. Enables ambient presence between developers and bidirectional interactions while enforcing strict privacy — no code, messages, or context ever leave your machine.

How it works

AgentSmith is a Claude Code plugin that captures lifecycle events (session start/stop, tool use, prompts, etc.) and streams them to a shared room via a lightweight local proxy. Other developers in the same room see each other's activity on a web canvas in real time.

Claude Code → plugin hooks → local proxy → API server → shared room

• Privacy first — only event metadata is transmitted, never code or conversation content
• Non-blocking — all hooks run asynchronously, so Claude Code stays fast
• Room-scoped — events are isolated per room; join different rooms per project

Install

Quick install

macOS / Linux:

curl -LsSf https://agentsmith.me/install.sh | sh

Windows (PowerShell):

irm https://agentsmith.me/install.ps1 | iex

The installer checks prerequisites (Claude Code, Bun), adds the marketplace, lets you choose an install scope, and configures your username and server URL.

Prerequisites

• Claude Code (v2.1.34+)
• Bun runtime (required by the local proxy)

Manual install

# Step 1: Add the marketplace
claude plugin marketplace add plosson/agentsmith

# Step 2: Install the plugin (pick one)
claude plugin install agentsmith@agentsmith-marketplace              # all projects (recommended)
claude plugin install agentsmith@agentsmith-marketplace -s project   # this project, shared with team
claude plugin install agentsmith@agentsmith-marketplace -s local     # this project, just you

Uninstall

Quick uninstall

macOS / Linux:

curl -LsSf https://agentsmith.me/uninstall.sh | sh

Windows (PowerShell):

irm https://agentsmith.me/uninstall.ps1 | iex

Or if you have the repo cloned:

./scripts/uninstall.sh

This removes the plugin from all scopes, removes the marketplace, and optionally deletes your config.

Manual uninstall

claude plugin uninstall agentsmith                  # remove from user scope
claude plugin uninstall agentsmith -s project       # remove from project scope
claude plugin uninstall agentsmith -s local         # remove from local scope
claude plugin marketplace remove agentsmith-marketplace
rm -rf ~/.config/agentsmith                         # optional: remove config

For development

git clone https://github.com/plosson/agentsmith.git
cd agentsmith
claude --plugin-dir ./plugin

Configure

Create ~/.config/agentsmith/config with the following variables:

AGENTSMITH_SERVER_URL=https://your-server.example.com  # API server URL
AGENTSMITH_KEY=your-auth-token                         # Auth token
AGENTSMITH_ROOM=default                                # Room name

The local proxy URL (AGENTSMITH_CLIENT_URL) is written automatically when the proxy starts.

Plugin commands

Command	Description
/room [name]	Set the active room for this project (override)
/room	Show the current room
/room reset	Remove the project override, use default room
/server status	Show proxy status, config, and connectivity
/server restart	Restart the local proxy

Tracked events

The plugin captures the full Claude Code lifecycle:

SessionStart SessionEnd UserPromptSubmit PreToolUse PostToolUse PostToolUseFailure PermissionRequest Stop Notification SubagentStart SubagentStop TeammateIdle TaskCompleted PreCompact

Architecture

agentsmith/
├── packages/
│   ├── api/              # REST API server (Hono + SQLite)
│   └── shared/           # Shared types & Zod schemas
├── plugin/               # Claude Code plugin
│   ├── hooks/            # Shell scripts + local Bun proxy
│   └── commands/         # /room, /server
└── docker/               # Deployment

Tech stack: Bun, TypeScript, Hono, SQLite, Zod, Auth0, Biome

Development

bun install              # Install dependencies
bun run dev:api          # Start API server (watch mode)
bun test                 # Run all tests
bun run lint             # Biome lint
bun run format           # Biome format
bun run typecheck        # TypeScript check

License

MIT