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UI Skills is a command-line tool and collection of skills for design engineers working with AI coding agents. Its registry can be browsed from a terminal with commands such as `npx ui-skills start`, `categories`, and `list --category motion`, while individual skills such as `baseline-ui` can be fetched with `get`. It also exposes the registry to agents over the Model Context Protocol through `list_skills` and `get_skill`, and provides a playbook of distilled design-engineering lessons.

mu (μ) is a coding agent with a judgment kernel, built on pi and AionUi. A small judge handles bounded decisions around context admission, command risk and approval, task framing, memory, completion, drift, browser actions, and multi-agent coordination, while the main model performs the coding work. Each decision can be active, shadow, or off and can use Jev, the local Laya judge, or another LLM; verdicts, probabilities, and timings are recorded in a local ledger that can be inspected from the command line or desktop app. The system admits tool output chunk by chunk, archives or removes stale context, applies rule-based safety checks before judgment, and uses a shared board to route findings among non-editing sub-agents. It provides an npm-installed command-line interface and a native desktop app, supports model-provider connections and importing Claude Code or Codex conversations, and states that it is in early development with no release yet; names, settings, and formats may change.

docume is a framework for comparing and evaluating agent-related components and context, including skills, AGENTS.md files, and MCP tools. It splits a skill into small, checkable claims, tests a model with and without each claim, and produces an initial vector showing what the model already knew, what the skill teaches, and which details may make performance worse. The framework also covers evaluations, context-impact assessment, routing, and comparison of descriptions and naming.

Agent Skills is an open-source collection of engineering workflows for AI coding agents, developed by Addy Osmani. It packages senior-engineering practices into skills covering the development lifecycle: defining specifications, planning, incremental implementation, testing and debugging, constraints, code review, web-performance auditing, code simplification, and shipping. Slash commands such as /spec, /plan, /build, /test, /review, and /ship activate the corresponding workflows, while skills can also activate automatically based on the work being performed. The /build workflow can generate a plan and implement its tasks in an approved pass, while retaining test-driven verification, individual commits, and pauses for failures or risky steps. It can be installed with the skills CLI or integrated into supported coding agents including Claude Code, Cursor, Codex, Copilot, and Cline.

Universal Modder is an open-source toolkit by rehan-remade for AI coding agents that create offline, single-player mods for PC games. Its skills and tools identify a game's engine and existing modding route, inspect code and files, back up saves, build a working mod slice, generate art, 3D assets and audio through the fal MCP server, test the result in the running game, package it, and record findings for later agents. The repository supports Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and other agents that read AGENTS.md, and includes the Python `um` CLI for game scanning, asset generation and processing, Windows automation, save management, video capture, publishing checks and a shared knowledge base of game-specific field notes. Its rules restrict use to games owned by the user and offline or single-player work; they prohibit online cheats, anti-cheat or DRM bypasses, and distributing game files or decompiled code. The repository is MIT licensed and requires Python 3.10+ and ffmpeg; Blender is used for 3D-to-sprite rendering.