Appendix C — Pi Patch Desk: The Capstone

Wed, 14 Oct 2026 09:00:00 +0100

You have finished the book. Now give its mechanisms one job to do together.

Pi Patch Desk takes a small parser bug through reproduction, investigation, editing, verification and review. At the end you receive a proposed patch and a dossier explaining what happened. You can inspect the change and the recorded checks without trusting the agent’s final prose.

This appendix is a supplement added after the book’s initial publication. The forty-two numbered chapters and Appendices A and B keep their order and paths. The implementation lives in the public pi-agents repository, alongside the book’s executable examples. The Pi Patch Desk solution page is its practical entry point; here you will run the example and connect each decision to the material you have read.

Capstone on AIBussin — AI applications, systems and books

Appendix C — Pi Patch Desk: The Capstone