Hearth v1.3.0

Hearth v1.3.0

This is the first release of the new Hearth: a desktop app for building and
playtesting games with a coding agent. It replaces the Hearth game engine,
whose final release was
v1.2.1.

The window is one workspace. You talk to a coding agent in a conversation
column; the game runs in a pane beside it and stays running while the agent
edits, so you see the change land instead of reading about it. Bot playtesting
is built in — sweeps drive the game and write evidence (journals, captures,
sweep results) that both you and the agent can read back to decide whether the
change actually worked.

Bring your own agent. Hearth works with an Anthropic API key, with a ChatGPT
sign-in through the open-source Codex CLI, or with any CLI agent you already
run in a terminal.

Coming from 1.2.1

Installed apps update to this version automatically. The scene editor,
inspector, and the rest of the engine authoring surface are gone: Hearth no
longer ships its own engine, and 1.x project editing is retired with it. The
engine's code and releases stay available — the engine-v1 branch and the
v1.2.1 release are permanent.

Downloads

Desktop builds are attached below: macOS (.dmg), Windows (.exe), Linux
(.AppImage / .deb). macOS builds are Developer ID signed and notarized.
Windows builds are not code-signed yet, so SmartScreen may require
More info → Run anyway on first launch.

The release also includes standalone tools that run on any Node.js 20 or newer
installation, without the app:

• hearth-cli.mjs — the Hearth CLI.
• hearth-mcp.mjs — the MCP server, for Claude Code and other MCP clients.
• hearth-player.js — the web-export player; keep it beside the CLI, or set
  HEARTH_TOOLS_DIR, so hearth export web can find it.

Documentation: https://github.com/echoo19/hearth#readme