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Drive and visually QA the dev-3.0 UI in a real browser (headless Chromium via agent-browser). Use when verifying a UI/UX change, reproducing a visual bug, taking screenshots of the running app, or self-QA before review. Triggers — "check the UI", "screenshot the app", "does this render", "QA this screen", "verify the UI change in a browser", "drive the app".

Create the initial Product UX Bible for an existing web or full-screen web app by deeply auditing the repository, using sub-agents when available, and generating docs/ux manifests, schemas, budgets, surface maps, action taxonomy, and design-token policies from observed code.

Principal UX architect skill for planning UI features before implementation. Reads and maintains docs/ux manifests, classifies the feature, decides placement, navigation, action hierarchy, design-token roles, accessibility, states, responsive behavior, and produces a precise implementation brief without coding unless explicitly asked.

Game design brainstorming partner for Cossacks: Back to War (2002) and its fork (v1.52). Deep knowledge of all 20 nations, unit balance, economy, formations, and core mechanics. Use when the user wants to brainstorm game design ideas, discuss game balance changes, propose new mechanics, analyze unit/nation balance, discuss economy tuning, or think through any aspect of Cossacks game design. Triggers on: game design discussion, balance analysis, feature brainstorming, "what if" scenarios for Cossacks gameplay, nation/unit balance questions, economy balance, formation mechanics, new game modes. Always respond in Russian.