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Overview
Notes on how engineering shapes production AI, and how AI is reshaping engineering. Click to read Lighthouse AI, by Rafael Pierre, a Substack publication.
News
I Changed One HTTP Header in GitHub Copilot. It Stopped Charging Me.
Hello, Rafael here - every week I cover interesting challenges and developments that I've come across recently through the lens of an engineer building AI systems.Subscribe and get my weekly takes Previously, I showed how I intercepted GitHub Copilot's ne
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Last Week's Top AI Repos: Edition #1
Hello, Rafael here - every week I cover interesting challenges and developments that I've come across recently through the lens of an engineer building AI systems.Subscribe to get weekly issues Subscribe nowHello! Today I'm starting a new recurring sectio
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I put GitHub Copilot Behind a MITM Proxy. Here's What I found.
Hello, Rafael here - every week I cover interesting challenges and developments that I've come across recently through the lens of an engineer building AI systems.Subscribe to get weekly issues Subscribe nowThere has been a flurry of AI-powered apps and A
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A Python Toolchain Built for the Agentic Engineering Era
Forwarded this email? Subscribe here to get Lighthouse AI in your inboxI have to admit: I have never been a huge fan of pre-commit hooks. I always felt they were slow and broke up my development pace. That opinion and my broader laziness about automated q
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Cutting Anthropic Token Costs and Latency with Prompt Caching
If you're building agents with Anthropic models, you've seen the pattern: token prices keep falling, and your invoice keeps climbing. The reason is structural. Multi-step, tool-using agents re-send their entire context - system prompt, tool definitions, c
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