I made Claude smarter by writing it a letter

A coding agent's recurring mistakes can provide concrete material for better instructions. In this workflow walkthrough, Theo of the t3.gg channel describes asking agents to audit his past sessions, identifying repeated problems, and rewriting his instruction files around those failures.

One example concerns pull-request descriptions that listed implementation details without explaining the problem being fixed. He added contrasting examples of unclear and useful descriptions, then showed later descriptions that better expressed the reason for the change. The technique makes a subjective preference explicit and reusable. His reported improvement concerns his own workflow; the session comparisons also involved different models doing different kinds of work.