Build Anything With Claude (That’s Actually Good)

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Summary

Riley Brown demonstrates how to build a full-stack, real-time web application called "Agent Native Trello" using Anthropic's Claude Desktop app, Claude Code, and the Claude Fable 5.1 model. He shows how the app integrates Convex as a real-time reactive backend and database, allows multiple external AI agents (such as GrokBot on Cursor and Codex on ChatGPT) to interact with the board using an exported markdown skill, and deploys the finished product to Vercel.

What is shown

• [00:00] Overview of Anthropic's announcement of Claude Fable 5.1 and Claude Mythos 5.1, along with a demo of a 3D browser Call of Duty clone generated with Fable 5.1 in four prompts.
• [00:48] Claude Desktop application interface, navigating from standard Chat and Cowork modes into Claude Code running Fable 5.1.
• [01:49] Claude subscription breakdown table showing pricing and usage allowances for Claude plans (Free, Pro, Max 5+, Max 20+, Team, Enterprise) regarding Fable 5.1 credits.
• [02:44] Walkthrough of the initial design prompt written in Excalidraw, defining platform, functions, Trello-like features, agent-native skill integration, military/minimalist aesthetic, and Convex database requirements.
• [03:49] Claude desktop connectors/plugins UI showing integrations with Google Drive, Gmail, Slack, and the official Convex plugin.
• [07:15] Pasting the comprehensive prompt into Claude Code to scaffold the Next.js and Convex application.
• [08:48] The generated web app running locally at localhost:62829, demonstrating user signup, the board layout, and inspecting the automatically generated Convex schema and data tables in the Convex dashboard.
• [10:54] Exporting the generated agent.md skill instructions and pasting them into GrokBot (xAI Grok running in Cursor) to allow it to autonomously register itself and add tasks/comments to the live board.
• [13:26] The live Trello-style board updating in real time as GrokBot populates cards and adds a "Key Emails" column without page refreshing.
• [14:28] Reviewing the app against six evaluation criteria (Function, Layout, Mobile, Data, Test, Secure) and submitting a refinement prompt to Claude Code to adjust styling, mobile view, and remove unwanted UI elements.
• [19:16] Testing multi-agent integration by copying the agent skill into OpenAI's Codex (GPT-5.6 Sol High in ChatGPT desktop), having it register as "Riley's Codex", read the board, and add cards.
• [20:11] Signing in as a second human user ("Jacob") in an incognito window, adding comments, and demonstrating multi-user real-time comment synchronization.
• [21:12] Catching an encoding/apostrophe display bug, taking a screenshot, and feeding it to Claude Code to patch.
• [22:12] Asking Claude Code to push the project to a GitHub repository and deploy the full-stack app live to Vercel (agent-native-board.vercel.app).
• [23:05] Verifying the deployed production app on Vercel, having Codex clear and populate the board with actual business priorities, and logging notes in the agent notebook.

Claims & numbers

• The presenter claims Anthropic released "the world's most advanced models for coding and knowledge work," referring to Claude Fable 5.1 and Claude Mythos 5.1 announced on September 1, 2026.
• The presenter states he created a playable Call of Duty browser game using Fable 5.1 in "just four prompts."
• Pricing displayed for Claude tiers: Pro is $20/month; Max 5+ is $100/month (includes up to 50% weekly allowance with Fable 5.1 credits); Max 20+ is $200/month (includes up to 50% larger weekly allowance with Fable 5.1 credits); Team standard seat is $25/person; Team premium seat is $125/person; Enterprise is $20/seat + usage.
• The presenter notes that on the $200/month Max 20+ tier, he used Fable heavily for three straight days and was at 75% of his weekly limit.
• The initial generation of the full Next.js/Convex app took approximately 21 minutes (shown on timer: 21m 10s using 3 tools).

Notable quotes

• [00:00] "Anthropic just released the best coding model in the world, and today I'm going to show you how easy it is to build a real, useful app for your business..."
• [01:43] "...as of right now when I'm filming this video, Fable 5.1 is the best coding model in the world."
• [20:07] "...any agent that I have should be able to update and edit this, and because all of my agents are connected through these plugins up here... my agent has context over my entire business."

Assessment

This is a genuine, hands-on developer tutorial and practical demonstration of Claude Code paired with Fable 5.1, Convex, and Vercel. While the video is sponsored by Convex and features typical enthusiast pacing, the workflow is shown in real time with unhidden terminal commands, actual waiting times, minor bug fixing (such as character encoding issues and UI adjustments), and real cross-agent interaction.

Described by gemini-3.8-flash on 2026-09-29 from the video's audio and frames.