2 min lesson
Context is not a pile of files
Use one lesson detail to answer "What's the single most useful piece of context for a bug-fix task?" Keep it direct.
Step 1 of 3
Context is not a pile of files. It is the evidence Agent needs to make one decision at a time. A small bug fix may need the failing test and one implementation file. A migration may need the old pattern and the target API docs.

The composer is where you decide what goes into the run. Whatever you attach here is what Agent gets to work from.
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Optional practice
Practice: Context is not a pile of files
QAgent must fix a failing checkout-total test. What do you attach?