Webapp Testing

General-purpose browser automation for coding agents: the agent writes and runs custom Playwright scripts on the fly, from a single page check to a multi-step flow, with a visible browser by default so you can watch it.

Publication-quality figures for ML papers: picks the chart type for your results, writes the matplotlib or seaborn code and checks its colors for contrast. Use it to compare methods, baselines or ablations in a chart, to check whether text and figure colors meet a contrast ratio, or to plan an architecture diagram from your method section.

Karpathy's observations on how LLMs fail at coding, codified into four rules the agent follows: think before coding (state assumptions, ask instead of guessing), simplicity first, surgical changes, and goal-driven execution.

Builds an animation from scratch the way a design engineer would: it chooses the curve, duration and properties, keeps motion off the main thread where it matters, and explains the choice.

Translates Apple's interface and motion principles into web code: spring curves, gesture physics, translucent materials and typography, as explained in Apple's WWDC design sessions.

Turn the project you just built into a short, shareable launch video with one command. Your agent reads the project code, so no live URL or screenshots are needed.

Anthropic's canvas-design skill guides Claude to produce finished visual artefacts (posters, covers, social graphics) by composing on an HTML canvas with deliberate typography, grid and colour decisions rather than defaulting to a template.

Anthropic's financial-services marketplace: a core financial-analysis plugin (comps, DCF, LBO, three-statement models in Excel, deck QC) plus vertical bundles for investment banking, equity research, private equity, fund administration, operations and financial advisors, 11 named agents and connectors to Daloopa, Morningstar, S&P Global, FactSet, PitchBook and more.

A universal SEO skill for Claude Code: 26 sub-skills and 19 specialist sub-agents covering technical audits, content quality, schema, E-E-A-T, local and e-commerce SEO, hreflang, backlinks, sitemaps, images, generative-engine optimisation and agent readiness (llms.txt, WebMCP).

Seventy-plus skills for equity investors and traders: market-breadth analysis, VCP and CAN SLIM screeners, breakout trade planning, risk-based position sizing, earnings-reaction scoring, technical charting, economic calendars, a value-dividend screener and a portfolio manager with Alpaca.