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About the Author

Sébastien Brochet is a technical professional specializing in AI agent development within the Microsoft ecosystem.

With experience spanning enterprise agent architectures, multi-agent orchestration patterns, and comprehensive technical documentation, Sébastien has built production Copilot Studio agents for global organizations — discovering the patterns, gotchas, and trade-offs documented in this book through real-world deployment.

His approach to technical knowledge: evaluate, don't just demonstrate. Every pattern should show multiple approaches with honest trade-offs — because the right answer depends on your context, not the author's preference.

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Acknowledgments

This book was shaped by:

  • Game Programming Gems (Mark DeLoura) — for the "gem" format: self-contained, practical, expert-written solutions to recurring problems.
  • Design Patterns (Gamma, Helm, Johnson, Vlissides) — for the principle that patterns should evaluate trade-offs, not prescribe one way.
  • The Copilot Studio community — for the questions, bugs, workarounds, and shared discoveries that informed these patterns.
  • Microsoft Learn documentation — the foundation that every Gem builds upon and extends.

First Edition — February 2026