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ai systems

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The ReAct loop of think, act, observe and repeat feeding each observation back into the context, beside plan-and-execute and reflection, and the loop that fails by never converging

AI SystemsDay 63Oct 4, 2026

Think, Act, Look, Repeat

system-design ai-systems agents

A prompted JSON response wrapped in markdown and a cheerful preamble against constrained decoding that enforces the shape while generating, and the business validation a well-formed response still needs

AI SystemsDay 62Oct 3, 2026

Stop Asking Nicely For JSON

system-design ai-systems llm

Recall@k measuring whether the right passage reached the context and faithfulness measuring whether the answer was supported by it, and a chunking change that improved one number while breaking the other

AI SystemsDay 61Oct 2, 2026

We Can't Improve What We Only Eyeball

system-design ai-systems rag

Vector search ranking millions of separately embedded documents by distance in milliseconds, then a cross-encoder reranker reading the query and fifty candidates together and reordering the top five

AI SystemsDay 60Oct 1, 2026

The Top Five Aren't The Best Five

system-design ai-systems rag

A policy clause cut in half at 500 characters so neither piece retrieves, beside fixed-size, recursive, semantic and parent-document chunking, and the token ranges different content types actually want

AI SystemsDay 59Sep 30, 2026

Where We Cut Decides What We Find

system-design ai-systems rag

Four hundred identical refund-policy questions each billed in full, beside prompt caching at the model provider and semantic caching by embedding similarity, and the 0.92 match that returns the wrong answer

AI SystemsDay 39Sep 8, 2026

The Same Question, Paid For Twice

system-design ai-systems semantic-caching

The Search That Can't Spell — system design card, day 27, AI systems: BM25 keyword results and vector results merged by reciprocal rank fusion so an exact citation surfaces above essays about the concept

AI SystemsDay 27Aug 27, 2026

The Search That Can't Spell

ai-systems system-design rag

Your Agent Is A Confused Deputy — system design card, day 17, ai systems

AI SystemsDay 17Aug 17, 2026

Your Agent Is A Confused Deputy

ai ai-systems security

Your RAG Isn't Hallucinating — system design card, day 7, ai systems

AI SystemsDay 7Aug 7, 2026

Your RAG Isn't Hallucinating

ai ai-systems rag

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