Personal Tooling as Competitive Advantage

The Shift

When code is cheap, the differentiator isn’t “can you build it” but “did you build the right thing for your workflow?” Shared tools are commodities. Custom tools that match how you think, how you work, your specific bottlenecks—that’s leverage. But it also means everyone needs to become a toolsmith.

Source Context

  • How I AI: “Building Custom Dev Tools and Model-vs-Model Reviews” (CJ Hess)

    • Built Flowy: custom visual planning tool designed to guide Claude Code through complex projects
    • Not about complexity—about matching his mental model
    • That’s not shareable in the same way a library is

  • How I AI: “Beyond Vibe Code: Advanced AI Engineering” (John Lindquist)

    • Mermaid diagrams for efficient context loading
    • Stop hooks in Claude Code for automated quality checks
    • Structural organization + intelligent context management

The Core Idea

In this new age of “code is cheap,” chances are it’s going to be better for you to build your own tool. What is the tool that you will use that will make you perform better?

Sure, you can share them and maybe more than one person uses it, but each developer needs to develop their own custom tooling.

Open Questions

On custom tooling:

  • If everyone needs custom tools, does that mean tooling itself becomes the job? (You’re not a developer, you’re a developer of developer tools for yourself.)
  • How do you avoid the trap of infinite tool yak-shaving?
  • What’s the difference between “building leverage” and “building a custom prison”?
  • When everyone’s using the same AI, is custom tooling the only differentiator left?

On authorship:

  • If AI removes the friction of building, what’s the new friction? (Design? Taste? Judgment?)
  • Flowy isn’t better because it’s more complex—it’s better because it matches a specific mental model. How do you develop that clarity about your own mental models?
  • Is the skill “building tools” or “knowing what tools to build”?

On sharability:

  • Why aren’t these tools shareable the way libraries are? Is it truly that they’re too specific, or that we haven’t found the right abstraction layer yet?
  • If tooling becomes personal, does that fracture the community? Or does it enable a new kind of collaboration?

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