https://codestoa.com/ 2026-10-25 daily 1 https://codestoa.com/ai-engineering/ 2026-10-25 weekly 0.8 https://codestoa.com/system-design/ 2026-10-23 weekly 0.8 https://codestoa.com/ai-engineering/agent-guardrails/ AI Agent Guardrails: Limits That Keep an Agent Safe https://media.codestoa.com/ai-engineering/agent-guardrails/poster.jpg?v=1c74bb60 What AI agent guardrails are, where they sit in the agent loop, and six kinds with examples: input checks, tool permissions, limits, approval and budgets. https://media.codestoa.com/ai-engineering/agent-guardrails/long.mp4?v=95e03587 2026-10-25 monthly 0.7 https://codestoa.com/ai-engineering/agent-loop/ The Agent Loop: How an LLM Plans, Acts and Knows When to Stop https://media.codestoa.com/ai-engineering/agent-loop/poster.jpg?v=e97f79c1 How an agent loop works: the model picks a tool, your code runs it, the result goes back into the history, and guards decide when the loop must stop. https://media.codestoa.com/ai-engineering/agent-loop/long.mp4?v=f58bc1b4 2026-10-24 monthly 0.7 https://codestoa.com/ai-engineering/agent-tool-calling/ Tool Calling: How an Agent Picks and Uses a Tool https://media.codestoa.com/ai-engineering/agent-tool-calling/poster.jpg?v=7675fdb0 Tool calling (function calling) explained: the model never runs the tool, it only writes the call. How it picks a tool, fills arguments, and when to call none. https://media.codestoa.com/ai-engineering/agent-tool-calling/long.mp4?v=d42e03fb 2026-10-24 monthly 0.7 https://codestoa.com/ai-engineering/jev-decision-model/ Jev Explained: A Decision Model vs an LLM https://media.codestoa.com/ai-engineering/jev-decision-model/poster.jpg?v=cd7942c0 What a decision model like Jev is, how it differs from an LLM, what's confirmed vs vendor-claimed, and when picking from a list with a score beats text. https://media.codestoa.com/ai-engineering/jev-decision-model/long.mp4?v=ceb871b7 2026-10-24 monthly 0.7 https://codestoa.com/ai-engineering/llm-eval-methods/ LLM Eval Methods: Code Checks, Human Review and LLM-as-Judge https://media.codestoa.com/ai-engineering/llm-eval-methods/poster.jpg?v=44921fc5 Learn the three LLM eval methods (code checks, LLM-as-judge and human review), when to use each, their limits and how real eval suites layer them. https://media.codestoa.com/ai-engineering/llm-eval-methods/long.mp4?v=cf062a9f 2026-10-23 monthly 0.7 https://codestoa.com/ai-engineering/llm-evals-introduction/ LLM Evals: Why "It Looks Good" Isn't Enough https://media.codestoa.com/ai-engineering/llm-evals-introduction/poster.jpg?v=14bf10b6 What LLM evals are, why a few manual prompts aren't testing, and the seven-step workflow engineers use to measure AI apps before users find the failures. https://media.codestoa.com/ai-engineering/llm-evals-introduction/long.mp4?v=024d9c4f 2026-10-19 monthly 0.7 https://codestoa.com/ai-engineering/llm-evaluation-criteria/ LLM Evaluation Criteria: Quality, Safety and Operational Metrics https://media.codestoa.com/ai-engineering/llm-evaluation-criteria/poster.jpg?v=98d2ab89 Learn which LLM evaluation criteria to measure: answer quality, safety and operational metrics, told through one support bot, plus a runnable report card. https://media.codestoa.com/ai-engineering/llm-evaluation-criteria/long.mp4?v=0b22fdff 2026-10-22 monthly 0.7 https://codestoa.com/ai-engineering/llm-failure-points/ Failure Points in LLM Applications: Where RAG Apps Break https://media.codestoa.com/ai-engineering/llm-failure-points/poster.jpg?v=780f7b47 Follow one question through a RAG chatbot to see where LLM apps fail: retriever, generator, workflow and application, and why one eval pipeline isn't enough. https://media.codestoa.com/ai-engineering/llm-failure-points/long.mp4?v=04d99da6 2026-10-22 monthly 0.7 https://codestoa.com/system-design/back-of-the-envelope-estimation/ Back-of-the-Envelope Estimation for System Design https://media.codestoa.com/system-design/back-of-the-envelope-estimation/poster.jpg?v=4250c6c1 Learn back-of-the-envelope estimation: work out requests per second, peak load, storage and bandwidth with round numbers, and let them decide your design. https://media.codestoa.com/system-design/back-of-the-envelope-estimation/long.mp4?v=a3cb3b26 2026-10-23 monthly 0.7 https://codestoa.com/system-design/how-to-approach-system-design/ How to Approach a System Design Problem, Step by Step https://media.codestoa.com/system-design/how-to-approach-system-design/poster.jpg?v=a9cfd007 A five-step way to approach any system design problem or interview: clarify requirements, estimate, sketch the design, deep dive, then trade-offs. https://media.codestoa.com/system-design/how-to-approach-system-design/long.mp4?v=3192d77e 2026-10-23 monthly 0.7 https://codestoa.com/system-design/what-is-system-design/ What Is System Design? The Parts, the Promises and the Trade-offs https://media.codestoa.com/system-design/what-is-system-design/poster.jpg?v=c5031dd7 What system design is, in plain words: the parts of a system, how they connect, the promises it keeps under load, and why every design is a trade-off. https://media.codestoa.com/system-design/what-is-system-design/long.mp4?v=221aa10d 2026-10-23 monthly 0.7 https://codestoa.com/about/ yearly 0.3 https://codestoa.com/privacy/ yearly 0.1