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semantic-compress

Make an LLM-directed document smaller while preserving what it does. Two modes: a local span-level core->pointer pass, and an A/B-validated distill loop that produces the smallest document that behaves the same as the original. Point at core knowledge the model already holds (a concept name activates it); keep project-specific detail explicit and verbatim. TRIGGER when asked to compress, tighten, shorten, or strip a prompt / instruction / system message meant for an LLM; to distill a skill; to compress a whole document; to make this smaller while preserving behaviour; to A/B test a compression or produce a behaviourally-equivalent compression; when an instruction set explains concepts the model already knows from training; or when reducing token cost of an LLM-directed prompt without losing meaning. Not for human-facing prose - that is /deslop.

skills/semantic-compress/SKILL.md

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# Semantic Compress

Make a document written **for an LLM reader** smaller while preserving what it *does*. The essence of an LLM-directed document is **behavioural**, not textual - the behaviour it induces in the reading model across the tasks it handles. Compression splits content into two kinds and treats each correctly:

- **Core knowledge** - anything in the model's training (named concepts, standard definitions, common-domain background). Replace the explanation with a **pointer**: the bare concept name or a short cue that activates the right knowledge. A pointer costs a few tokens and reliably switches on the model's existing understanding; a full explanation is wasted tokens, and *deleting the concept entirely* gambles that it is already active in the model's reasoning - often it is not, and disambiguation suffers.
- **Project / bespoke knowledge** - anything the model cannot know from training: specific facts, local decisions, constraints, and non-standard twists on a known concept. Keep these **explicit and verbatim**. The model has no other source for them.

Compression is therefore **point at core, spell out bespoke**. Pointing is not deletion and it is not full explanation; it is the minimum that both activates the right core knowledge and preserves every bespoke detail.

## Mode Selection

This skill operates in one of two modes, selected **deterministically**:

| Input | Mode | What happens |