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    "title": "GAP-PROMPT-007: Context Compression Families",
    "displayName": "GAP-PROMPT-007: Context Compression Families",
    "slug": "docs/harness-features-backlog/gaps/prompt-engineering/gap-prompt-007",
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    "article": "\n# GAP-PROMPT-007: Context Compression Families\n\n| Field | Value |\n|-------|-------|\n| Category | prompt-engineering |\n| Priority | Medium |\n| Effort | L |\n| Status | Partial |\n\n## Description\nGroup related context into compression families so that compaction can preserve semantic coherence. Instead of token-density compression, group related effects, file contexts, and iteration summaries for intelligent compression.\n\n## Current State\nThe compression module uses FNV-1a hash-based dedup and library file caching. Compression is token-density oriented with no semantic grouping. Related context fragments may be compressed independently, losing coherence.\n\n## Target State\nContext grouped into families: per-effect context, per-file context, per-iteration summary, cross-cutting concerns. Compression operates on families, preserving internal coherence while compacting across families.\n\n## Dependencies\n- [GAP-PROMPT-001](../prompt-engineering/GAP-PROMPT-001.md) -- strata model for family placement\n\n## Key Files\n| Component | Path |\n|-----------|------|\n| Compression module | `packages/sdk/src/compression/` |\n| Prompts module | `packages/sdk/src/prompts/` |\n| CC prompt phrasing analysis | [`11-prompt-phrasing-analysis.md`](../../11-prompt-phrasing-analysis.md) -- Section 8 (Compaction Protocol) documents CC's semantic compression with mandatory sections and analysis/summary structure |\n\n## Recommendation\nPhase 4 implementation. Define compression families as metadata on prompt sections. Modify the density-filter engine to respect family boundaries.\n",
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