Send this before the session degrades, not after. The Traps section is the one that pays for itself: without it the next session confidently repeats the approach you already know does not work.
Prompt
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We are nearly out of context. Do not write code.
Write HANDOFF.md with exactly these sections, short:
- Goal: what we are building, two sentences.
- Done: what works now, with the files that hold it.
- Open: what is not finished, with the next concrete step.
- Decisions: choices we made that are not obvious from the code, and why.
- Traps: what you tried that did not work, so the next session does not repeat it.
Nothing else. No summary of the conversation.