context-compressor
Context Compressor
Finite channel (context window) must carry maximum decision-relevant signal. Score fragments by entropy and redundancy, cut or compress accordingly.
Vocabulary
| Info Theory | Context Engineering |
|---|---|
| Channel / Capacity | Context window / window minus system prompt overhead |
| Entropy | Information per token |
| Self-information | How much a fragment reduces agent uncertainty |
| Redundancy | Tokens carrying no new info given other context |
| Lossy compression | Summarize at lower fidelity to save tokens |
| Lossless compression | Reformulate more densely, same facts |
Phase 1 — Budget
Calculate: window - system_prompt - tools - history - output_reserve = available.
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