Cheat sheet

Context engineering

From lesson 0009. Curate the tokens on this call. A bigger window is not the first move.

1. EvictDrop low-signal tokens. Lightest: clear old tool dumps.
2. CompactSummarize. Next window gets the summary, not the raw log.
3. NoteWrite outside RAM. Pull back later. Survives a reset.

Not

• Not prompt engineering (that is the standing orders). This is the rest of the window, each turn.
• Not a bigger cap. Context rot and the U-curve still apply. Window card.
• Compaction lives in RAM and dies with the process. A note is disk.
• Just-in-time files: keep a path, load this turn. JIT card.
• Sub-agents: isolate the greps. Sub-agents card.
• Skills already did progressive disclosure. Skills card.

Anthropic: smallest set of high-signal tokens. Product forms: compaction, context editing. When this rung is enough: stack choice.