The video demonstrates customizing Claude Code into "Claude Designer" to achieve 10x faster UI iteration within Cursor.
This acceleration is possible by directly forking and generating 5 to 10 different UIs simultaneously, utilizing Claude Code's parallel task commands and a new SDK.
Users can prompt Claude Code to spin up multiple sub-agents (e.g., "Start a three parallel agent to implement variations of the to-do app UI").
This enables the concurrent generation of distinct UI styles, such as minimalist, modern, or Kanban, for faster design iteration.
A recent debate on Twitter involved a dev team's blog post advising against multi-agent systems for coding due to potential merge conflicts, as sub-agents lack context of each other's work.
They suggested a single-threaded approach was more suitable for coding tasks.
However, Anthropic later published a blog post detailing their use of multi-agent systems for parallel research tasks.
The presenter argues that while full context is often necessary, parallel tasks are beneficial for scenarios like research (spinning up five research topics and summarizing) and UI design (forking and comparing multiple variations side-by-side).
Firecrawl is introduced as a smart and reliable solution for converting any website data into a format friendly for large language models (LLMs).
It was the first open-source project to offer an effective way to clean and optimize website content for LLM consumption.
Features include browsing subpages, handling PDFs, Word documents, and Excel files linked from URLs, and smart anti-bot content loading for strict websites.
Recent updates include a new search endpoint for finding relevant websites and extracting markdown content in a single API call, significantly speeding up AI applications.
A new extract endpoint can manage pagination and page interactions, allowing agents to navigate e-commerce sites, click buttons, retrieve full content, and even handle login/authentication.
These capabilities are accessible via API endpoints, enabling agents to gain internet and research abilities with minimal code or integration with platforms like Zapier.
The Claude Designer workflow is built upon four core concepts: sub-agents, cloud.md, commands, and Git worktree.
cloud.md allows customization of Claude Code's behavior, similar to Cursor rules, by providing specific instructions and knowledge about when to use or avoid parallel tasks.
Commands enable the definition of common, predefined workflows that Claude can follow.
Customizing Claude Code with cloud.md and Commands 04:07
cloud.md can be used to set general instructions (e.g., "always respond in all caps") or specialized prompts for UI design, including details about color, font, and layout.
It can also enforce specific rules, such as always creating a single HTML file when generating UI iterations, avoiding complex project structures.
Commands allow for the creation of prompt templates with arguments (e.g., a "joke" command where the topic is passed as an argument).
Commands also have the powerful ability to execute command-line actions (like checking git status) before performing a task, enabling workflow automation.
A UI workflow demonstration uses two custom commands: extract_system.md and iterate_design.md.
extract_system.md analyzes an image URL of a UI mock, extracting design elements like color patterns and typography, and saves them as a design_system.json file in a prd folder. This method is more effective than directly referencing the UI image.
iterate_design.md instructs Claude to spin up 3-5 sub-agents to concurrently implement the same UI in different styles, based on the extracted design_system.json.
It outputs single HTML pages into an UI_iterations folder (e.g., UI1, UI2, UI3).
Users can select a preferred version (e.g., UI2) and then use the same command to iterate further on it (e.g., "try dark mode"), generating new parallel variations.
This process allows for rapid iteration and the combination of styles from different generated versions.
Parallel UI Iteration for Production Apps with Git Worktree 09:44
For iterating UI on existing production Next.js applications, Git worktree is introduced as a solution.
Git worktree enables the creation of multiple isolated sandbox environments of a repository, allowing multiple Claude Code instances to work on individual worktrees without interfering with each other's progress.
A new worktree can be set up using git worktree add -b <branch_name> <path>, which effectively copies the project into a new, isolated folder.
Changes made within a worktree can then be merged back into the main branch.
A custom command, execute_parallel_agents, automates this process: it takes a user request (e.g., "try three versions of UI: one nerdy style, one kid style, and one gaming style").
This command first creates multiple Git worktrees based on the request, installs dependencies, and then launches parallel sub-agents, each assigned to a different worktree/branch.
This allows for the simultaneous generation of multiple distinct UI versions (e.g., nerdy, kids, gaming styles) in separate folders, though the process can take some time due to rate limiting.
Superdesign.dev: A Visual UI Design Extension 14:04
The presenter and a friend developed Superdesign.dev, an open-source Cursor extension that integrates the Claude AI SDK.
This extension enables users to experiment with different UIs directly within their IDE, featuring a canvas on the right for real-time preview of generated UIs.
Users can select a preferred version, request variations, or iterate with specific feedback (e.g., "build a hi-fi mock based on this layout").
The extension generates multiple high-fidelity mockups based on the provided feedback.
Once satisfied, users can copy the full style prompt to use with Cursor or Claude Code for the actual web application implementation.
This initial version (v0.01) currently generates single HTML pages, with future plans to add default worktree support for existing production applications.
The presenter expresses excitement about the project and encourages user feedback.
Superdesign.dev is open-source, with links provided in the description for download and trial.
The prompts shared in the video will be made available in the "AI Builder Club," a community for AI builders focused on launching AI products and sharing useful workflows for AI coding and large model software development.