Hearth: an open-source, agent-native desktop app for agentic game development.
Skill Claude CodeCodex
Give a Hearth game real art and sound — importing and slicing spritesheets, animations, procedural sprites and sounds, autonomous CC0 asset sourcing (Kenney, itch.io, OpenGameArt, Freesound, Google Fonts) with licensing rules, and pixel-art discipline (never stretch; read the art before using it). Use when the game…
Skill Claude CodeCodex
Structure a Hearth game's world — scenes, entities, components, tilemaps and autotiling (surfaces must connect), collider/sprite alignment, prefabs, animation state machines, and input bindings. Use when creating or arranging what exists in a Hearth game (levels, objects, hierarchies); behavior scripts are…
Skill Claude CodeCodex
Write behavior in Hearth — Lua/JS scripts, the ctx API (input, timers, tweens, events, camera, audio, save), script modules and require, the dot-call and userdata pitfalls, deterministic RNG, and the check-script/edit-script iteration loop. Use when making things happen in a Hearth game (movement, AI, pickups, rules)…
Skill Claude CodeCodex
Shape a complete Hearth game, not just working mechanics — scoping to session length (the verbs × levels × enemies budget), the teach → develop → escalate → climax → end arc, real endings (a win state, not just game-over), one-element-at-a-time difficulty ramps, scenes-as-levels pacing with gated progress and…
Skill Claude CodeCodex
Make a Hearth game feel good, not just run — the juice stack (hit-stop, screen shake, flash, particle bursts, layered sound), tween easing, camera effects, anticipation/recovery animation idioms, game-UX conventions (menus, pause, onboarding, difficulty, save etiquette), effect-asserting playtests, and the quality bar…
Skill Claude CodeCodex
Let the engine hunt bugs for you — bot playtesting via hearth sweep. Seeded bot policies (mash/idle/wander/seek) play a scene headlessly across many seeds and report softlocks, crashes, stuck states, and unmet objectives as a compact evidence report; objectives double as executable acceptance criteria; a failing seed…
Skill Claude CodeCodex
Operate the Hearth engine as a coding agent — the session loop (recall → snapshot → change → validate → playtest → screenshot → remember), project memory, permission modes, verification, review/undo, and export. Load FIRST whenever a project has a hearth.json or the task mentions Hearth. Routes to the domain skills…