zallen.dev
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Resources

The reference shelf.

Two series read as references rather than news. Start at part one of either.

Building an AI System

From empty repo to production orchestration - every piece, in order.

01Start Here - Building an AI System02The MCP Server on an Azure Function App03Connectors04Data Flow05Custom Instructions06Multi-Client Wireup - ChatGPT, Claude Code, Grok, Copilot07Where We Are Now08Service-Side Infra - RAG, Vector, and a Local Service API09External Tool Access10The Agent - an Azure AI Intelligence App11Build Your Own

The Reading Room

AI, explained by the system itself.

01What an AI Agent Actually Is02Tokens and the Context Window03Embeddings: How a Computer Gets Meaning04RAG in Plain English05Tool Calling: How an LLM Actually Does Things06MCP, Explained07What an Eval Is08The True Cost of One LLM Call
System Design Reference

The modern stack, top to bottom, as one page.

Open the reference →
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About40 pieces · 2 series · 2 builds© 2026 Zach Allen