Build a tiny agent for one app task

A developer makes small purpose-built agents, including one inside a music player, because the useful core can be very short.

Done with Custom agent· Beginner· Sep 2026

What they did
They prefer making many narrow agents instead of trying to build a general coding assistant. One example they mention lives inside their music player. Their view is that if an agent does one useful thing, the code behind it can stay very small.
How it went
They do not describe a specific payoff or measured result. Their point is mainly that these little agents are easy to create, unlike broader coding agents, which they describe as harder to make well.
Tips
Keep the job narrowly defined and skip the idea of a do-everything coding agent. If you want to try this, start with one simple action inside an app you already use.

Try it yourself with Claude Code

Help me design a small agent for [app] that handles just one task: [specific task]. Keep the implementation minimal, under [number] lines if possible, using [language] and [LLM/API]. Show the steps to build it, then stop and ask for my approval before any action that would send, delete, submit, or pay for anything. Finish by giving me a simple test I can run on [sample input] to check that it works.

Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.

Read the original on news.ycombinator.com ↗

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