AIArtificial IntelligenceAgent Clinic
BOOK 3
The Five Patterns
M.R. Sterling
AI Agents · Book 3 of 9

The Five Patterns

Almost every useful agentic system is one of five shapes, or two joined together, and knowing the names is worth more than it sounds - it turns "I need an AI thing that handles enquiries" into "that is routing with a chain behind each branch", which is something you can build, cost and test. Prompt chaining, routing, parallelisation by sectioning or voting, orchestrator-workers, and evaluator-optimiser. Which four of the five are workflows rather than agents, and why that means they can be tested instead of merely evaluated. Ends with a four-question decision procedure you run before writing anything.

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What is inside

How this book is built, and why you can trust it.

  • Every model name, price, limit and feature was checked against the vendor's own published documentation
  • Every number in a worked cost example was computed, not estimated
  • One idea per chapter, in plain English
  • Five challenges with a full answer key, and a glossary

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