game-dev-skills

In the author's own words, from each skill's SKILL.md.

• 3d-model-generator-by-threejs

  Generate procedural 3D models from natural-language requests by writing a constrained buildModel(ctx) module that uses Three.js, bundled builders and helpers, deterministic validation and export scripts, PNG previews, and optional browser visual review. Use when needs to create, revise, export, or visually audit programmatic 3D assets in GLB, glTF, OBJ, or STL without Blender or another DCC tool.

  skills/3d-model-generator-by-threejs/SKILL.md on GitHub (opens in a new tab)

• animation-shader

  READ this skill when implementing or configuring animation-style shaders (Toon/Cel Shaders) — including outlines, rim lighting, toon shading, MatCap, emission, dissolve, hatching, or any stylized rendering effect. Contains preset styles and feature-to-reference mappings for lilToon, Poiyomi, UTS2, RToon, SToon, and ToonShadingCollection. Works as a domain knowledge plugin alongside workflow skill…

  skills/animation-shader/SKILL.md on GitHub (opens in a new tab)

• game-architect

  READ this skill when designing or planning any game system architecture — including combat, skills, AI, UI, multiplayer, narrative, or scene systems. Contains paradigm selection guides (DDD / Data-Driven / Prototype), system-specific design references, and mixing strategies. Works as a domain knowledge plugin alongside workflow skills (OpenSpec, SpecKit) or plan mode of an agent.

  skills/game-architect/SKILL.md on GitHub (opens in a new tab)

• game-balance-analysis

  Specialized in game numerical design, this skill designs first-pass game balance values, diagnoses and tunes existing systems, and evaluates balance proposals by building and running executable models, simulators, parameter sweeps, and evidence checks. Use for combat, progression, economies, items/builds, PvP/metagames, and random rewards when the task requires concrete numbers or a supported ver…

  skills/game-balance-analysis/SKILL.md on GitHub (opens in a new tab)

• game-design-review

  Review, critique, compare, improve, or stress-test an existing game concept, GDD, mechanic, puzzle, economy, level, theme, emotional arc, interface, narrative, social feature, prototype, pitch, or playtest result. Use when the user asks what is weak, risky, unclear, unbalanced, contradictory, insufficiently engaging, or worth validating next in a game design. Produce evidence-based findings, expl…

  skills/game-design-review/SKILL.md on GitHub (opens in a new tab)

• game-image-generation-rules

  Plan, generate, inspect, vision-evaluate, refine, and package images and visual assets for game development through a backend-agnostic production loop. Use for PNG or SVG props, icons, characters, environments, tiles, UI, HUD/gameplay screens, VFX, transparent cutouts, concept or worldbuilding boards, sprite sheets, static sprite collections, or animation frames; especially when the task needs ba…

  skills/game-image-generation-rules/SKILL.md on GitHub (opens in a new tab)

• gpt-image

  Execute image generation, editing, and chroma-key transparent-background workflows with GPT Image 2 / gpt-image-2 through the bundled scripts. Use when GPT Image is the selected backend and a supplied prompt or edit instruction must be executed for text-to-image generation, reference-image editing, multi-reference editing, masked inpainting, or chroma-key background removal. Treat the supplied pr…

  skills/gpt-image/SKILL.md on GitHub (opens in a new tab)

• imagemagick-cli

  Comprehensive ImageMagick 7 command-line image processing for inspecting, converting, resizing, cropping, compositing, masking, drawing, annotating, color correction, quantization, filtering, morphology, distortion, animation, montage, comparison, metadata, batch automation, and advanced pixel analysis. Use whenever a task mentions ImageMagick, `magick`, `identify`, `mogrify`, raster image conver…

  skills/imagemagick-cli/SKILL.md on GitHub (opens in a new tab)

• lucida-remove-background

  Remove image backgrounds locally with Lucida's bgr CLI and save transparent RGBA PNGs while preserving soft alpha in glass, smoke, glow and VFX, camouflage, text and logos, line art, illustrations, and print designs. Use when a user asks to remove, erase, isolate, cut out, or make the background of an image transparent; prefer Lucida for translucent or effect-heavy artwork and BiRefNet-HR for hig…

  skills/lucida-remove-background/SKILL.md on GitHub (opens in a new tab)

• openrouter-image-generate

  Generate images through OpenRouter's dedicated Image API. Use this skill whenever the user wants to create, render, generate, or save images with OpenRouter, including text-to-image, image-to-image/reference images, choosing OpenRouter image models, listing image models, setting resolution/aspect ratio/quality/output format, or passing provider-specific image options. Prefer the bundled Python sc…

  skills/openrouter-image-generate/SKILL.md on GitHub (opens in a new tab)

• openrouter-video-generate

  Generate and download videos through OpenRouter's dedicated asynchronous Video API. Use this skill whenever the user wants to create, render, generate, poll, resume, or save an OpenRouter video, including text-to-video, first/last-frame image-to-video, reference-to-video, choosing or listing video models, setting duration/resolution/aspect ratio/audio/seed, checking job status, downloading comple…

  skills/openrouter-video-generate/SKILL.md on GitHub (opens in a new tab)

• slice-video-frames

  Extract ordered still-image frames from local video files with FFmpeg, using a fixed FPS, an exact frame count, explicit timestamps, or every source frame; optionally remove a flat chroma-key background and emit timing metadata. Use for video-to-frame conversion, animation frame sampling, contact-sheet inputs, sprite animation source frames, dataset frames, thumbnail sequences, or any request to…

  skills/slice-video-frames/SKILL.md on GitHub (opens in a new tab)

• gat-brainstorm

  Develop or refine a game concept through a one-question-at-a-time design interview, then create GAT game overview, systems index, and global art direction documents; also supports discussion-only exploration. Use for game concepts, core loops, system boundaries, scope, or visual direction in a GAT project.

  gat/.agents/skills/gat-brainstorm/SKILL.md on GitHub (opens in a new tab)

• gat-design

  Design one system or all remaining systems within a specific planned GAT milestone, producing milestone-scoped GDD, optional content data, and art documents while updating progress and auditing consistency. Requires an explicit milestone.

  gat/.agents/skills/gat-design/SKILL.md on GitHub (opens in a new tab)

• gat-milestone

  Plan ordered GAT milestone handoff slices from overview and narrative documents, create the milestone roadmap and per-milestone brief skeletons, and stop before technical design or implementation. Use after foundational GAT documents are ready and before per-system design.

  gat/.agents/skills/gat-milestone/SKILL.md on GitHub (opens in a new tab)

• gat-story

  Develop or refine a GAT game's premise, world, characters, quests, dialogue, tone, and narrative delivery through a one-question-at-a-time interview, then write the needed global narrative documents; also supports discussion-only exploration.

  gat/.agents/skills/gat-story/SKILL.md on GitHub (opens in a new tab)

• gat-workflow-start

  Inspect GAT pre-production state, report overview, narrative, and per-milestone progress, and recommend the earliest actionable next step. Use when the user asks to start, resume, inspect, or route a GAT workflow.

  gat/.agents/skills/gat-workflow-start/SKILL.md on GitHub (opens in a new tab)

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