Agent-First Directory Blueprint: Cut AI agent API bills by 70% with lean project architecture

Hey Product Hunt! 👋

I built the Agent-First Directory Blueprint after waking up to a painful surprise on my monthly API invoice.

Like many of you, I rely heavily on AI coding agents like Cursor, Cline, and Aider every day. They made me 10x faster, but they were also quietly burning hundreds of dollars in background token usage.

When I dug into why, I realized the problem wasn't my prompts—it was my project structure. Every time I asked the agent to "fix a tiny bug," it was re-scanning node_modules, build caches, old logs, and massive docs, polluting the context window and causing hallucinations (which led to even more expensive retries).

So, I redesigned my repositories from the ground up with an Agent-First Architecture. The results were immediate:

📉 Up to 70% drop in monthly API token bills (cutting requests from ~100k tokens down to ~20k)

🎯 Significantly fewer hallucinations because the model only sees high-density, relevant code

⏱️ 15-minute setup using zero external tools—just better folder boundaries and strict ignore rules

-Inside this blueprint, you’ll get:

-The Ideal Directory Layout (separating active src/ logic from docs/ and historical noise)

-A Battle-Tested .aiignore Template ready to copy-paste into your root folder

Lightweight AGENTS.md & Rule Files to stop agents from running expensive full-repo scans

It’s completely actionable—you can apply it to your current codebase today and see the token drop on your very next prompt.

I’d love to hear from fellow builders here:

What’s the highest surprise AI API bill you’ve ever gotten, or what tricks are you using to keep your context window lean?

Thanks for checking it out, and happy building! 🚀