1. Find some known-good code you trust and measure coverage. 2. Find a few missing coverage lines. 3. Write tests. 4. Find bugs!
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I don't use subagents much: I usually want to discuss and iterate on the subtask. Subagents are typically unattended.
I find myself writing md files for a new session to read. Are there any harnesses that treat forking as a first class feature?
I find myself just taking photos of documents for submitting forms, rather than scanning.
Scanning still feels more 'official' (a PDF instead of a JPG) but the sheer convenience of using a phone wins every time. I've rarely seen organisations complain about photos.
Compiler error messages is such a deep topic. Even in rustc, a mature compiler that invests effort in diagnostic quality, I find interesting issues every few months.
(The majority have been fixed pretty quickly, so it's really rewarding to file issues.)