John Henry · Open Source

Libraries and tools for AI clients, agent protocols, math, and animation — all MIT-licensed, all on npm.

The libraries

ai.mateyA unified client for the browser's built-in AI APIs and remote model providers, with a matching mock and test harness.

Agent QueryQuery and inspect MCP, A2A, and ACP servers through one interface — plus TanStack bindings and a policy gate.

MathGeometry, intervals, tensors, signals, and units — a core package plus a wide family of focused extensions.

ecmanimProgrammatic animation for the web: scenes, shapes, and transforms rendered to canvas.

wshBrowser-native remote command execution over WebTransport/WebSocket, with Ed25519 auth, session recording, and an MCP bridge.

Optical Artifact TransportSigned, capability-safe state and UI transport between devices over just a display and a camera — animated QR fountain codes, no network required.

http-fieldsHTTP Structured Field Values (RFC 8941/9651) — strict, zero-dependency parsing and serialization, plus typed header helpers.

andboxA small sandboxing helper for running untrusted JavaScript.

objectifyTurn a directory tree into a structured object — designed to be legible to agents.

CircuitThe design system behind these docs and the erisera product sites.

About

These are personal open-source projects, maintained under github.com/johnhenry and published to npm. New packages use the @johnhenry/* scope; several older ones keep their original unscoped names.

Commercial products live separately at erisera.com.