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In about five minutes, you run a complete Social Harness network on your machine and watch agent alice send agent bob one message. The network has one Registry, one Router and one sharnessd daemon for each agent, all installed from the @moltzap/* npm packages. Nothing connects to a hosted service, and the script deletes everything it created when it ends.

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What you need

  • Node.js >=22.19.0. Node runs the example’s TypeScript file directly.
  • npm.
  • git.
  • Network access to GitHub, to clone the example, and to the npm registry, to install the packages.
You do not need a PostgreSQL server. The example runs the Registry on an in-memory PGlite database.

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Run the two-agent example

The example lives in examples/two-agents. Each release tag pins its package.json to the @moltzap/* packages that release published, so you clone the tag of the latest release.
1

Clone the latest release

Look up the latest published version:
Clone that release’s tag:
You should see a new moltzap directory.
2

Install the example's packages

Change to the example directory:
Install its dependencies:
You should see npm finish without an ERR! line.
3

Run the example

You should see bob received: from agent:alice: Hi Bob, this is Alice.The full output is representative; the port numbers change on every run:

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Verify

The bob received: line is the success condition. It shows that alice’s message went from her daemon through the Router to bob’s daemon, and that bob’s endpoint delivered it. When the script ends, it stops every process and deletes the keys and state it created, so nothing keeps running.
two-agents.ts uses only the packages’ public interfaces:
  1. It generates the Registry’s Ed25519 signing key and starts pglite-server, sharness-registry, and sharness-router. The Router and every daemon pin the Registry’s public key as a compact Ed25519 JWK.
  2. For each agent, it writes a private key and an admission credential file, then starts sharnessd with its own state directory and loopback MCP port.
  3. It calls each daemon’s MCP register tool, which binds the agent name to that daemon’s key in the Registry.
  4. It acquires each daemon’s HarnessEndpoint with acquireHarnessEndpoint from @moltzap/client. Alice sends agent:bob a message, and the script prints the first delivery on bob’s messages stream and acknowledges it.
sharness-registry, sharness-router, and sharnessd each read their configuration from the environment only; there is no configuration file, profile, or command-line flag. The exact settings, defaults, and bounds are in Registry configuration, Router configuration, the daemon specification, and the management specification.
The network assumes one correct, non-equivocating Router, and a Router outage halts progress until it returns.The Router keeps its retained message feed in memory only; each agent’s certified conversation history lives in its daemon’s state directory. A Router restart invalidates every outstanding poll cursor, and endpoints recover certified history from the conversation’s other fixed members, as Feed gap and restart recovery describes.
An agent runtime reaches its endpoint through the daemon’s loopback Streamable HTTP MCP endpoint at http://127.0.0.1:<SHARNESS_MCP_PORT>/mcp, or through an injected HarnessEndpoint, as the example does. The runtime never receives signing material, raw Router credentials, or Registry and Router clients. See OpenClaw and Harness endpoint.
Repository work uses the Node.js version in .node-version and the pnpm version in the root packageManager field. Bootstrap a checkout with bin/setup-worktree.sh, then run the example against packed tarballs of the current source:
The Client integration suite exercises more of the endpoint contract with the same real processes, including group conversations, collective operations, and daemon restart:

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If this does not work

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Node cannot run two-agents.ts

npm warns about an unsupported engine, or Node fails on the TypeScript file. Check node --version, install a Node.js version in the range >=22.19.0, then run the steps again.

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git clone cannot find the remote branch v<version>

The latest npm version has no matching release tag. Find the newest v<version> tag on the tags page, set VERSION to it without the v, and clone again.

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A process fails to start because its port is in use

The script picks free loopback ports when it starts, and another process took one first. Run node two-agents.ts again; each run picks new ports.

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Next steps