Brian Casel - Videos
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Build your own marketing tools with Claude Code
Colleen Schnettler is a Ruby on Rails developer who worked at ClickFunnels, runs SimpleFileUpload (https://www.simplefileupload.com), and is now launching a technical marketing consulting business....
Why I Stopped Using AI Frameworks in 2026
Brian argues that complex AI frameworks are now "overkill" and explains why he has reverted to using native, vanilla tools for 90% of his daily work. 👇 **Your Builder Briefing (free)** https://bui...
The Easiest Way to Train Your AI on Your Codebase
Arvid demonstrates his workflow of recording a video walkthrough of his app as if training a new employee, then having Claude convert the transcript into a structured technical documentation file (...
Brennan Dunn’s Team of (AI) Developers
In this 2nd installment of 'Builder Stories', Brennan Dunn, founder of RightMessage (https://rightmessage.com), a website personalization tool, shows us his sophisticated system of custom AI agents...
Agent OS v3: Leaner & Smarter for Building in 2026
Agent OS v3 is here — rebuilt from the ground up for how we actually build in 2026. I stripped out 70% of the framework. What's left: a leaner system for discovering, documenting, and injecting yo...
Arvid Kahl’s SaaS is 98% Coded by Claude
Trying something new on the channel! This is episode #1 of a new series called 'Builder Stories' where I'm inviting fellow builders to show us how they build and tell the story of their transition...
Claude Code is all you need in 2026
Claude Code in 2026 is not what it was when it launched. After a year of building frameworks, custom setups, and elaborate systems to make AI coding work, we've come to a point now where... most of...
Replacing my n8n workflow with a Claude Code Skill
I spent a week building a complex n8n workflow for AI image generation — then scrapped it and rebuilt the whole thing as a Claude Code skill in 30 minutes. Here's why automation without intelligenc...
This one AI skill multiplies all the others
Knowing when to use Claude vs ChatGPT, terminal vs IDE, subagents vs main context—that's workflow orchestration. Build this intuition and you're not just reacting to AI tools, you're directing them...
Design OS: The Missing Design Process for AI-First Development
AI coding tools build fast—but the results are a hodgepodge. Disconnected screens. Generic UIs. No cohesion. And re-prompting just makes it worse. Design OS fixes this. It's a methodical design pr...
Cursor's New Visual Editor: When It's Useful (And When It's Not)
Cursor's new visual editor lets you tweak CSS visually and apply changes directly to code. I break down when it's actually useful and when you'll want to reach for something else. 👇 **Your Builder...
Stop Prompting in Circles (Do This Instead)
The secret to great AI-generated code isn't better prompts—it's better specs. Here's how to let AI interview YOU with clarifying questions so your agents build exactly what you envisioned, first tr...
Build with paralell agents in Cursor 2.0
Watch me use Cursor 2.0 to build a feature with multiple agents building in parellel, then compare their work and choose a winner. 👇 **Your Builder Briefing (free)** https://buildermethods.com - Y...
I want to like Google Antigravity, but...
I was genuinely excited about Google Antigravity's fresh ideas for the agentic IDE—multi-project management, multi-agent orchestration, and that clever screen recording review process. But when I a...
Taking Cursor's new Composer 1 model for a spin
Watch me build using Cursor's new 'Composer 1' model that dropped with Cursor 2.0. This thing is fast! 👇 **Your Builder Briefing (free)** https://buildermethods.com - Your free, 5-minute read to ...
Claude Opus 4.5 vs. Google Gemini 3: Design & build an app
Let's compare Claude Opus 4.5 and Google Gemini 3 to see how they stack up when it comes to planning, designing frontend and backend for a new app! Plus how I evaluate new frontier models when the...
A short history of devs adopting AI (it happened fast)
rom tab-completion to autonomous agents—here's the 3-year timeline that changed everything about how we build software. If you've been skeptical about AI coding, you were actually right to be... un...
Breaking a Spec down into Tasks using Agent OS v2
How I break a feature spec down into a task lists using Agent OS v2. 👇 **Your Builder Briefing (free)** https://buildermethods.com - Your free, 5-minute read to keep up with the latest tools & wor...
Spec a new feature using Agent OS
How I shape and plan a new spec for a new feature using Agent OS v2. 👇 **Your Builder Briefing (free)** https://buildermethods.com - Your free, 5-minute read to keep up with the latest tools & wor...
From AI skeptic to UNFAIR advantage
Your skepticism about AI coding was justified. But the shift that's happened over the last 12-24 months changed everything—and your experience is now your unfair advantage. I break down 5 skills t...
How Developers Should Use Claude Code Skills
After a week of testing Claude Code Skills, I've found two clear patterns where they actually make sense. First, they excel at utility tasks that pop up unpredictably - like commit messages, code r...
Claude Code Skills vs. Subagents, Commands, and Memories
Claude Code Skills just launched, but what exactly are they? In this quick comparison, I break down how Skills differ from the tools you already use - they're not like subagents (which run in isola...
Claude Code vs. Cursor vs. Codex: Cloud Agents Showdown
Cloud-based coding agents from Claude Code on the Web, Cursor Cloud Agents, and Codex all promise the same thing: kick off a task, walk away, and come back to a completed pull request. But do they ...
Cursor 2.0 Changed How I Work
Cursor 2.0 dropped last week, and unlike most recent AI updates, it's actually changed how I work. Two features in particular: Cursor's new Composer model that's 10-50x faster than any other coding...
Claude Code Skills: What Problem Do They Solve?
Claude just launched Skills across all their platforms, and I've spent a week testing the Claude Code implementation specifically. Do Claude Code Skills actually solve problems developers have, or ...
Agent OS v2: Spec-Driven Development with ANY AI Tool
Agent OS v2 is here: It's my free, open-source system that trains your AI coding agents to build like YOU—with ANY AI tool (Claude Code, Cursor, Codex, Gemini, or any other). Stop re-explaining ...
3 USEFUL New Features in Claude Code 2.0 #coding #ai #claudecode #anthropic
Claude 2.0 dropped! Here are 3 features I actually use on a DAILY basis. 👇 **Your Builder Briefing (free)** https://buildermethods.com - Your free, 5-minute read to keep up with the latest tools ...
Codex CLI first impressions (switch from Claude Code?) #coding #ai #codex #openai
My first impressions of using Codex CLI as a daily Claude Code user. 👇 **Your Builder Briefing (free)** https://buildermethods.com - Your free, 5-minute read to keep up with the latest tools & wor...
3 New Features in Claude Code 2.0 I use DAILY
Claude Code 2.0 dropped with Sonnet 4.5, a VS Code extension, and new features. But I've been testing these updates in production for weeks to see what's actually useful for professional developers...
Is Codex CLI Worth The Switch (from Claude Code)?
I've been a daily Claude Code user for most of this year but I wanted to give Codex CLI a look, since OpenAI has been making an obvious effort to win back developers. NOTE: I recorded this video t...
Spec-Driven Development in the Real World
The industry is converging on spec-driven development as the professional way to build with AI, but most tools are missing 3 critical aspects that make it actually work in the real world. I'll show...
Day One with Claude Code (Start Here)
So today's the day. You've been hearing about Claude Code for weeks. Now it's time for you to see what all the fuss is about. Here's what most newcomers get wrong about Claude Code. It's not about...
Agent OS: The System for Spec-Driven Development
Update! Agent OS v2 has been released. All new video demo here: https://youtu.be/kApsR0l9Jfw?si=x7IKxRHLIC3DktuT --- Two months ago, I released Agent OS—a free, open-source system that brings s...
Finding FLOW with AI Coding Agents
Remember what FLOW used to feel like? Hours would disappear. It felt amazing—that perfect flow state where you're crafting software with your hands. Sure, we're building much faster with AI now.....
Solving Claude Code's (Short-Term) Memory Problem
Claude Code forgetting things? The key is to manage Claude Code's context window—a.k.a. Context Engineering. This video covers how to be more efficient with your context useage, primarily by mark...
The Missing SYSTEM Your Coding Agents Need
Update! Agent OS v2 has been released. All new video demo here: https://youtu.be/kApsR0l9Jfw?si=x7IKxRHLIC3DktuT Our AI coding agents are capable of so much more. If we want our coding agents t...
Cursor Keyboard Shortcuts for POWER Users
As professionals, we have to master our tools. My daily driver for coding and building with AI? Cursor (a fork of VS Code). So I'm sharing all most frequently used Cursor keyboard shortcuts, how...
Claude Code Multitasking Made EASY
Claude Code is excellent as an autonomous coding agent. So the obvious next step is to run multiple Claude Code agents in paralell. Simple, right? Well, it's not quite as simple as it sounds. B...
The Case for Claude Code
Claude Code is having a moment right now. If you've been using other AI coding tools, like Cursor, you might be wondering, is Claude Code actually better? In this video I unpack 2 big questions a...
CRUSH Your Backlog With Background Agents in Cursor
Background Agents in Cursor and OpenAI Codex are here to help us off-load tasks from our backlog so that we can ship our apps faster. This video breaks down how to use the new Background Agents fe...
How Vibe Coding Goes PRO
Did you try vibe code with Cursor, etc. but it just didn't stick for you? Or maybe you're still an AI coding skeptic? It's time to take building with AI seriously. There's a new workflow and app...
Instant OpenAI and Claude Integrations in Your Rails Apps
See how easy it is to integrate the OpenAI and Anthropic Claude APIs in your Rails applications using the Instrumental Components library and starter kit for Rails. Grab your launch discount for I...
Adding Search to Any Rails Application
See how I add a search feature and wire it up in every Ruby on Rails app I build AND made it a re-useable component for you to use with Instrumental Components (https://instrumental.dev). I walk t...
Building a COMPLETE SaaS Billing System w/ Rails and Stripe
Watch me build a complete SaaS billing system in a Rails app in just a few minutes using Instrumental Commerce (which is included in Instrumental Components). Get your copy of Instrumental Compone...
How I Build Rails Apps FAST
As a full stack developer using Rails for all of my projects, I find that using my components helps me ship high-quality Ruby on Rails applications—packed with essential features—fast, so that I ca...
AI isn't my replacement. It's more.
I was slow to adpot AI in my day-to-day creative and software development workflow. That's changed. Here's my unexpected path to seeing AI not as my replacement, but something more... 00:00 The ...
Hotwire Gotchas #rails8
https://instrumental.dev 👉 Join our community and get access to the Instrumental Components library for rapidly building great products with Ruby on Rails and TailwindCSS. https://instrumentalprod...
The hard thing about hard decisions
Big decisions shape the direction of your career, your business—even your life. In this video, I share what I’ve learned from 18 years of running a bootstrapped business and navigating tough choice...
Account Switching
https://instrumental.dev 👉 Join our community and get access to the Instrumental Components library for rapidly building great products with Ruby on Rails and TailwindCSS. https://instrumentalprod...
Why I build products that scratch my itch
After years of customer discovery and customer validation, I’ve come full circle. In this video, I share why I now build products that scratch my own itch and how that simple shift leads to better ...