
Automated visual UI issue detection from screenshots. Use EVERY TIME you take a screenshot with agent-browser during UI development. Runs local Qwen3-VL model on Apple Silicon — zero API cost. Catches layout bugs, contrast issues, missing content, alignment problems, and accessibility violations that you'd otherwise miss while focused on one specific fix.
Build, test, validate, and improve Photon MCPs — single-file TypeScript MCP servers. Use for creating photons with @format annotations (table, chart:bar, slides), stateful photons using this.memory for persistent storage, photons with @readOnly/@destructive annotations, custom UI using @ui tags/HTML templates, photons wrapping APIs (Stripe, payments), task scheduler photons with cron, user-configurable settings (protected settings), this.render() for live output, photon build for standalone binaries, mermaid diagrams for photon architecture, editing .photon.ts files, @auth for MCP OAuth identity (this.caller), identity-aware locks for multiplayer/turn-based photons, @format slides for Marp-style presentations. Also use for validating photon UIs (promise checking, visual QA, functional testing), improving photon quality via autoloop, and auditing whether a UI consumes all backend methods. DO NOT trigger for general TypeScript or non-photon MCP.
Platform-aware design rules for vertical video (Reels, Shorts, TikTok, LinkedIn mobile). Covers safe zones, caption sizing/placement, aspect ratios, thumb-stopper hooks, effects that survive mobile compression, and per-platform cheatsheets. Use when building 9:16 / 4:5 / 1:1 video for social media - any time you need to decide where to place text, how big captions should be, what aspect ratio to export, or which effects survive mobile playback.