Hermes GameForge

The game-development plugin for Hermes Agent. Ask for a game and get one: sound effects, music, NPC voices, sprite sheets, tilesets and 3D models generated into a real project; playable web, Godot and Unity builds; Blender and Unreal pipelines; a playtester that actually plays the build and tells you where it breaks or gets boring; one-click export to the web, phones and itch.io.

Everything runs offline by default (pure Python + Pillow, which Hermes already ships). AI providers (Tripo, fal.ai, Meshy, ElevenLabs, Edge TTS, your Hermes TTS) are opt-in upgrades, never requirements. Nothing touches Hermes core: it is a standard plugin.yaml + register(ctx) plugin.

hermes plugins install DECRUX9812/hermes-plugin-gameforge --enable
hermes gameforge demo            # builds, playtests and exports a complete game in ~1 minute

What's in the box

Tool	Does	Offline
forge_sfx	22 presets (sfxr-compatible synth + layered footsteps, whooshes, magic, impacts), tweakable params, variation pools, 4 styles · ElevenLabs prompts	✓
forge_music	mood → mode, chord progression, motif-based melody, bass, arp, drums → seamless loop WAV + MIDI (+ stems) in chiptune / synthwave / ambient / orchestral	✓
forge_voice	NPC casts: Animalese-style babble, Edge neural TTS or your Hermes TTS, with character FX (goblin, giant, robot, ghost, radio, demon, fairy, elder, cave) and typewriter timings	✓
forge_sprite	16×16 RPG characters with 4-direction walk/idle, monsters, scalable item icons, props, AI image → pixel sprite, sheet packing → PNG + TexturePacker/Phaser JSON + Godot SpriteFrames + GIF	✓
forge_tileset	seamless Wang-corner transitions between 12 terrains (animated water/lava), fill variants, Godot TileSet with terrains + collision	✓
forge_model3d	18 low-poly generators (trees, houses, terrain, dungeons from ASCII, rigged blocky characters…), animation clips (walk, wave, open, spin…) → .glb + turntable · Tripo text- and image-to-3D with auto-rigging and preset animations · fal.ai / Meshy	✓
forge_engine	web: complete HTML5 game from your assets across 4 genres (topdown, platformer, arena, roguelike) · Godot 4: scaffold, import, headless run with parsed errors · Unity: scaffold + batch-mode setup · Blender: convert, LODs, Eevee turntables, animation, custom bpy · Unreal: asset import	✓
forge_playtest	plays the build in headless Chrome (explorer / monkey / vision-LLM agent) or bot-plays Godot at 40× real time → crashes, stuck spots, FPS, event droughts, boredom, deaths/wins, heatmap, HTML report	✓
forge_export	PWA bundle (installable on phones, offline), itch.io zip, single-file HTML, Capacitor Android/iOS wrapper, butler push, Godot and Unity platform builds	✓

Ten bundled skills teach the agent the workflows: gameforge:game-studio (idea → shipped), playtesting, godot-dev, unity-dev, blender-pipeline, game-audio, pixel-art-pipeline, 3d-asset-pipeline, ship-it and game-reverse-engineering (Ghidra headless export, ILSpy, GDRE).

Rigged 3D from a sentence

forge_model3d source=tripo runs Tripo's V3 chain in one call — text-to-model → animations/rig (biped, mixamo spec) → animations/retarget (preset clips, up to five) → download the .glb:

forge_model3d source=tripo prompt="a brass goblin chieftain" rig=true animate=[walk,wave]

What comes back is a rigged, animated .glb that imports into Godot, Unity, Unreal, Blender and three.js as-is. Without a Tripo key the same tool still produces rigged characters offline (source=procedural, clips: walk/wave/idle/spin/open/bounce/bob/pulse), so the pipeline is testable before you spend a credit.

The playtester

The headline feature. forge_playtest target=web launches headless Chrome (a dependency-free CDP client, no Playwright), waits for the game, and plays it:

• explorer walks toward ground it hasn't seen, remembers dead ends, fights when it can and restarts after game over; monkey mashes inputs to shake out crashes; agent lets your vision model look at the screen every few seconds, choose inputs and write tester notes.
• It records uncaught exceptions and console errors (with screenshots), FPS, input that changes nothing, getting stuck, event droughts (20 s+ with no pickup, fight or progress), low-novelty stretches, deaths per minute, damage-free wins, time to first event, and map coverage.
• Output: report.html / report.md / report.json, a timeline chart, a movement heatmap and a contact sheet of key moments. Verdict: SOLID, PLAYABLE, ROUGH or BROKEN.

Any web game works; games that publish window.__gameforge = {controls, state, events} (like the GameForge template) get richer signals. For Godot, a bot scene drives the input map with --fixed-fps 60, so 10 minutes of play run in about 15 seconds, and it can render real frames through Xvfb.

What evidence is saved when a build breaks

When a game throws an exception or enters an error screen, GameForge doesn't just log an exit code — it captures full diagnostic evidence:

1. Wire-level CDP exception hooks: Listens to Runtime.exceptionThrown and Runtime.consoleAPICalled to record the exact exception name, source URL, line/column number, and multiline stack trace.
2. Instant failure frame: Grabs an immediate viewport snapshot at the exact moment of failure (shots/01_error.jpg), so you see exactly what was rendered when it broke.
3. Structured artifact bundle written to <project>/playtest/<target>_<timestamp>/:
   • report.html — interactive visual report with embedded failure frames, metrics, and moment timeline.
   • report.json — machine-readable test ledger: issues ranked by severity (critical, major, minor, design), p50/p95/min FPS, and event counters.
   • report.md — clean summary suitable for PR comments or CI logs.
   • shots/ — high-res JPEG captures of boot, crashes, stuck spots, and checkpoints.
   • moments.jpg — chronological contact sheet of the run.
   • timeline.png — novelty and frame-rate progression chart leading up to the failure.
   • heatmap.png — 2D spatial coverage map showing where the player moved before failing.
4. Verdict Gate: Any critical error sets verdict: BROKEN. Stalls or repeated stuck spots set verdict: ROUGH. Clean playthroughs score PLAYABLE or SOLID.

One design, every engine

forge_engine engine=web action=scaffold generates every asset and writes web/game.json: the level map, tuning and asset paths. The Godot scaffold (main.gd) and the Unity scaffold (GameForgeTopDown.cs) read the same level and build it at runtime, so a design tweak in one file reaches all three builds. The project root doubles as the Godot project, so every res://assets/... path in generated .tres files just works.

Asset ledger

Every tool records what it made in <project>/gameforge.json: files, the exact recipe (tool, preset, seed, parameters) and licence. Any asset can be regenerated, varied or credited later. Procedural output is CC0. AI-provider output follows that provider's terms.

Settings

Hermes Desktop → Settings → Plugins → GameForge, or plugins.entries.gameforge.settings in config.yaml: default_project, godot_path, unity_path, blender_path, unreal_path, browser_path, and the optional secrets TRIPO_API_KEY, FAL_KEY, MESHY_API_KEY, ELEVENLABS_API_KEY (stored in .env).

Disclosure

• Network: none by default. Opt-in calls: Tripo / fal.ai / Meshy (3D generation; prompt and image are sent — Tripo also receives the rig and retarget task ids), ElevenLabs (SFX prompt), Edge TTS (dialogue text, when edge-tts is installed), GitHub (Godot export templates, only on forge_export target=godot_templates, about 1 GB), itch.io via butler (only on target=itch with an explicit itch_target).
• Processes: runs Chrome/Chromium headless for playtests, and Godot, Unity, Blender, UnrealEditor-Cmd, ffmpeg, xvfb-run or butler when a call asks for them. forge_engine engine=blender action=script runs a bpy script you point it at.
• Files: writes only inside the game project directory, plus a throwaway browser profile in the system temp dir. Export templates go to Godot's standard templates folder.
• No telemetry. No credentials read beyond the three optional keys above.

Development

python -m pytest -c tests/pytest.ini tests     # 59 tests; browser/Godot ones skip when absent
hermes plugins doctor . && hermes plugins validate .

MIT licence.