Retention / Pruning Protocol¶

Curation protocol — instantiates Variation–Selection–Retention Engine Design

Governs which retained variants earn continued storage and which are culled, keeping the surviving library small and current without ever pruning below the diversity reserve the loop needs to keep adapting.

A Retention / Pruning Protocol governs the retained population — the library of variants the loop keeps between rounds — deciding which earn continued storage and which are culled, so the surviving set stays small, current, and affordable. Its distinguishing idea is that pruning is bounded by a diversity reserve: culling may remove what is redundant, dominated, or stale, but never so much that the population drops below the variety the loop needs to keep adapting. Where a live contest looks forward and asks which variant wins now, this protocol looks backward and asks which variants have earned their place in memory — a curation of the archive, not a verdict on the front line.

Example¶

A museum's collection has outgrown its storage and curatorial capacity, and a deaccessioning protocol decides what to do with the overflow. The rule is not simply "remove the least-visited objects": it keeps full provenance and lineage records for everything, culls genuine duplicates and pieces whose provenance is too thin to support, and moves marginal items to deep storage rather than out the door. Crucially, it refuses to deaccession below a representativeness floor — never removing the last few examples of a category, technique, or period, even if each is individually low-value, because that variety is what lets the collection answer questions no one is asking yet. The collection shrinks to a maintainable, well-documented core while ≈three representatives of each category stay protected, and a complete record of what left, and why, survives every removal. Pruning happened; the reserve did not.

How it works¶

Curate the retention memory. Decide what stays in the library, and preserve the provenance and lineage of both kept and culled variants, so nothing leaves without a trace.
Apply a prune rule. Retire what is dominated, redundant, or stale — but as a governed, recorded act, not ad-hoc deletion.
Enforce the diversity reserve as a hard constraint. No prune may take the population below the floor of distinct variants the loop needs to keep adapting; the floor overrides the prune rule, never the other way around.
Prefer reversible removal. Archive to cold storage before deleting, so a variant that later proves valuable can be recovered.

Tuning parameters¶

Prune aggressiveness — how readily dominated, redundant, or stale variants are culled. Aggressive pruning keeps the library lean but edges toward the diversity floor.
Diversity-reserve floor — how many distinct kinds or representatives are protected from culling. A higher floor preserves adaptability at the cost of storage.
Archive versus delete — reversible cold storage versus hard removal, trading recoverability against cost.
Provenance retention — whether the lineage of culled variants is kept, which is what makes pruning auditable and reversible.
Prune cadence — continuous housekeeping versus a periodic sweep, best tuned in step with the loop's generation cadence.

When it helps, and when it misleads¶

Its strength is keeping the retained set current and affordable without spending the raw material of future adaptation, and making culling a governed, documented, reversible act rather than quiet deletion. It is what stops a variant library from either bloating into unusable sprawl or being trimmed into a monoculture.

Its central failure mode is over-pruning to uniformity: culling variants as "redundant" when they were in fact the diversity reserve, leaving the loop unable to respond when conditions shift — the organizational echo of a minimum viable population, below which a population loses the variation it needs to adapt.^[1] Premature deletion of a variant that later becomes valuable is the same error in miniature. The classic misuse is running the protocol backwards — pruning a favoured variant's rivals out of the library so the comparison can no longer be made, dressing the elimination of competition as housekeeping. The discipline is to treat the diversity floor as inviolable, prefer reversible archiving to deletion, and keep the lineage of everything removed.

How it implements the components¶

retention_and_lineage_memory — the protocol curates this memory directly: it decides what stays in the retained library and preserves the provenance and lineage of both kept and culled variants.
variance_floor_or_diversity_reserve — it treats the diversity reserve as a hard constraint on its own pruning, forbidding any cull that would drop the population below the variety the loop needs.

It curates the retained memory but does not maintain the raw lineage record as a standing artifact (that's Variant Lineage Log), detect in real time when diversity has already fallen through the floor and inject fresh variance (that's Variance Floor Trigger), or decide which variant wins the live role (that's Champion–Challenger Rotation).

Instantiates: Variation–Selection–Retention Engine Design — it is the loop's retention-side curator, keeping the archive lean without spending its diversity.
Consumes: the standing lineage record it prunes (Variant Lineage Log) and a dominance or fitness signal to judge redundancy.
Sibling mechanisms: Champion–Challenger Rotation · Generation Cadence Review · Environmental Shift Retest · Multi-Pressure Tradeoff Matrix · Selection Loop Map · Selection Pressure Sandbox · Variance Floor Trigger · Variant Lineage Log

Notes¶

Preserving diversity is split between two mechanisms with opposite tenses. This protocol is preventive — it refuses to prune below the floor in the first place — while Variance Floor Trigger is corrective, firing to inject fresh variance once diversity has already dropped through it. A loop that leans on the trigger to undo careless pruning has the division of labour backwards.

References¶

[1] Minimum viable population is the conservation-genetics idea that below a certain size a population carries too little variation to adapt or persist. The diversity reserve is the same principle applied to any retained variant set: prune beneath it and the loop keeps its current best while losing the raw material to produce the next one. ↩