Answer this question about the work just completed (this session, the last plan, or the diff in context):

anything you would do better in retrospect ?

Reply in chat only—never create files unless the user asks to apply a change.

Scope: The work that just shipped or the plan just executed—not a career retrospective, not a generic process lecture
Be specific: Name files, APIs, grep patterns, leftover folders, APIs you taught vs what the app still calls. Skip items that were the right call
Actionable: Each item implies a different next action (rewrite, delete, document, don't migrate). If you would not change it, omit it
Honest: Include mistakes (broken snippets, substring grep, hunting dirs that were already gone)
Short: A few bullets. No preamble. Do not offer to implement unless asked