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AI Agent Architecture Simplified
'Just add an agent' turned into spaghetti. Here is the ReAct loop you can actually fit in your head. Reason. Act. Observe. Then wire state and tools like a real system.
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Attention: Explained for Engineers
Attention still looks like matrix soup. Here is what Q, K, and V actually do. Why it scales ugly. How to use that when you size context and money.
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Bayes' Theorem Made Simple
Bayes shows up in papers and evals and you freeze. Here is a visual path through priors, likelihoods, and evidence. Plain vocabulary. No stats degree required.
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Build a HackerNews MCP Server From Scratch
From zero to a real MCP server. FastMCP. Real tools. A desktop client path. MCP reads like any other service you ship because it is one.
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Build a Research Agent in LangChain
The smallest LangChain stack for a ReAct research loop. Chat model. Tools. Scratchpad prompt. Executor. Skip drowning in framework trivia.
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DocString and Review Agent in LangGraph
Your agent never knows when to stop. LangGraph with typed state, nodes, edges, and conditional loops. Real design instead of a prayer loop.
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How LLMs Tokenize Text
Billing and limits disagree with your word count. Rare names and compounds blow up. Tokenization hits cost and quality like a tax you did not see coming.
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How MCP Works
How host, client, and server really connect in MCP. Integrate and debug like you own the wire, not like a tourist squinting at JSON.
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Prompt LLMs Like a Pro by Context Activation
Longer prompts made outputs worse. Word choice wakes the right slice of training. Stop building walls of text nobody reads.
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Setting Up AI Projects in Python
Your AI repo outgrew the demo script. Env files, pyproject, src layout, and a clean split between HTTP surfaces and agent code.
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Tests That Mean Something
Outputs drift. Your suite shrugs. Here are unit tests that pin behavior you actually care about. Skip the ceremony that only pads ego.
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Understand RAG From First Principles
Naive RAG parrots garbage. Your pile of docs is huge. The model’s window is not. Every extra token hits the invoice. Own the data path or keep paying for lies.
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Write System Prompts for AI Agents Like a Pro
When your system prompt is a novel and the agent still veers: what is already baked into models, and what to add so your instructions carry real signal.
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