Patterns

Build Your Own Tools

Claude builds you exactly the tool you need.

Software is free now

When OpenClaw launched, people lost their minds. It can message you on WhatsApp! It manages your projects! It accesses your email!

Everything OpenClaw does is valid. The tool itself is fine. What bothered me was the reaction. People were blown away by capabilities that Claude Code has had all along. You could have told Claude “message me on WhatsApp when you’re done” and it would have figured it out. You could have told it to access your email, manage your projects, build you a dashboard. All of that was always there.

The hype around OpenClaw wasn’t about OpenClaw. It was about people not understanding what Claude Code is. If they had, they wouldn’t have needed OpenClaw - they would have built their own version, tailored to exactly what they need. Or they would have looked at OpenClaw and thought “yeah, obviously” instead of “oh my god.”

That’s the idea behind this article: Claude builds you the tool. Any tool. Exactly the one you want.

What people are building

A multiplayer combat flight simulator - built in 3 hours, one HTML file, hit $1M ARR in 17 days. A native macOS app with 20,000 lines of Swift, fewer than 1,000 written by hand. A cardiologist who can’t code placed 3rd out of 13,000 applicants at an Anthropic hackathon by building a patient follow-up tool. A surfer built a hyperlocal surf forecasting app for his specific beach and put it on the App Store.

Someone built a tool that makes Claude call your Apple Watch when it needs a decision. Someone else hooked Claude up to an Arduino - it writes the code, compiles it, uploads it to the board, and watches the LED blink. There’s a MIDI controller where you play chords and Claude directs a four-track generative band around you in real time.

Isometric city visualizations. Pixel art agent simulations. Generative art with splash physics and schooling fish. An entire 5-song album synthesized from raw waveforms in Python, vocals generated with macOS’s say command.

None of these required a team. None of them took weeks. The barrier between “I want this to exist” and “it exists” is effectively gone.

A few from my own setup

I wanted Claude on my phone outside the app, so it built me a Telegram bot - full conversation threading, server-side, runs on my subscription. I wanted to search past Claude Code sessions semantically, so it built claude-memory - indexes every conversation into embeddings, stores them locally, returns relevant snippets with context. Then it built a 3D visualizer that maps the entire embedding space so I can see clusters of related conversations. I screenshot everything on my phone - things I want to remember, articles to read later, ideas, recommendations - but I never actually go back to any of it. So Claude built me an app that processes my screenshot folder, extracts the content, classifies it, and prepares it as structured notes I can actually use.

The pattern

  1. Describe what you want - plain language, no spec needed
  2. Claude builds it - complete implementation, not a scaffold
  3. Iterate - “add this feature”, “change how that works”, “make it faster”
  4. Own it - your code, your server, your data

You don’t need to be a developer. You need to know what you want.

Why this beats SaaS

It does exactly what you need. Not 80% of what you need plus 200 features you don’t. You own the code, so there’s no subscription that gets more expensive and no API that gets deprecated.

When something breaks, Claude fixes it - in the same conversation, with full context of the original implementation. And it compounds: each tool you build becomes context for the next one. Your CLAUDE.md knows about your tools, your skills can use them, your workflow builds on itself.

The question to ask

Before subscribing to any tool: could Claude build this for me in an afternoon? If the answer is yes - and it usually is - why would I pay for someone else’s version?

Getting started

Start with friction. What do you do repeatedly that annoys you? What tool do you use that’s almost right but not quite?

Describe it to Claude. See what happens.

"Build me a CLI tool that takes a URL,
extracts the main content, and saves it
as a clean markdown file in my Reference folder."

That’s a real tool. Built in one conversation. Used daily.