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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

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

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

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

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

Nowadays, most people seem to over-engineer their RAG stack. They jump straight to embeddings, vector databases, and reranking pipelines. Meanwhile, their users just want to find the doc that says "How to reset my password."In engineering, there's always

Ex-Hugging Face / Databricks. If you like my writing, I encourage you to subscribe to my newsletter Lighthouse AI, as well as liking, commenting and sharing my posts. All views are exclusively my own.

Writing code has never been cheaper. Reading it has never been more expensive.The page loaded. That should have been the end of it.I'd just shipped a feature in the Next.js agent evaluation suite I've been building. The button did the thing the button was

Cosine similarity ranks embeddings by the angle between them - but the metric quietly breaks down without proper normalisation.Back in college, I sat through endless lectures about eigenvectors, matrix decompositions, and vector spaces. I dutifully memori