@berthos/mesh-coordinator
The host-side service for Berth's WireGuard mesh. It gives each sandbox a stable mesh IP, exchanges public keys, and introduces two apps only when each one's network:peer:<name> capability names the other.
Berth runs an AI agent's tools in a sandbox. Each tool declares what it may touch in a berth.yml manifest, and the Linux kernel enforces it.
npm install -g @berthos/mesh-coordinator
Usage
BERTH_MESH_COORDINATOR_HOST=0.0.0.0 berth-mesh-coordinator # listens on 4875
berth dev --mesh-coordinator=http://host.docker.internal:4875
| Env var | Default | What it does |
|---|---|---|
BERTH_MESH_COORDINATOR_PORT | 4875 | Port to listen on |
BERTH_MESH_COORDINATOR_HOST | 127.0.0.1 | Address to bind. Containers usually can't reach the host's loopback, so set 0.0.0.0 or a bridge address |
BERTH_MESH_COORDINATOR_DATA_DIR | ./.berth-mesh-coordinator-data | SQLite database |
BERTH_MESH_COORDINATOR_TLS_CERT, _KEY, _CA, _REQUIRE_CLIENT_CERT | unset | Serve HTTPS |
To embed it, createMeshCoordinatorServer({ dataDir, tls?, logger? }) returns a Fastify instance.
The kernel can't tell WireGuard traffic apart per app, so the coordinator's mutual match is what decides which apps can reach each other. Run it somewhere only you control.
Docs
Mesh reference · TLS · Repo