Build a Reusable Claude Code Subagent: A Personal Assistant Guide

Suppose you often end the day with a jumble of errands, deadlines, meeting notes, and messages you still need to answer. You could ask Claude Code to sort them out, but you may have to repeat the same preferences each time: distinguish urgent tasks from vague ones, do not invent deadlines, and draft messages without sending them. A reusable subagent gives you a place to keep those instructions. This guide builds a personal-assistant subagent that organizes information you provide, drafts text, and helps plan.