Build product_shape classifier tool over fixed taxonomy

council rejected TOOL reversible: simple 6h proposed 3 Jun 2026

What is the proposed change?

Define product_shape_taxonomy.json with 6 labels: forecaster, oracle, gatekeeper, instrument, scaffold, retread. Each label has 2-3 anchor descriptions and 1-2 disqualifying patterns. Build product_shape_classifier.js that takes a hypothesis row, sends it to Gemini 3.5 Flash with the taxonomy as a one-shot rubric prompt, and returns {shape, confidence, evidence_quote}. Persist to engine.db hypothesis row via existing migration-free column product_shape (decage already added the column per e2cde0f). Run on the post-filter pool, not at genesis (cheaper to skip rejected).

Target files

hypothesis_engine/tools/product_shape_classifier.js hypothesis_engine/data/product_shape_taxonomy.json

Expected effect

Every kept candidate has a product_shape label with confidence ≥0.5. Missing-shape rate <5% over a 100-candidate sample. Downstream filter/ranking moves can read product_shape rather than re-deriving from text.

Falsifier — what would prove this wrong?

Hand-label 50 candidates blind across the 6 taxonomy buckets. If classifier-vs-human Cohen's kappa <0.5, taxonomy boundaries are ambiguous — taxonomy needs redesign before classifier is useful. Kill the proposal in that case.

Evidence that triggered the proposal

D — git commit e2cde0f adds product_shape column + ranking preference
D — brain/STRATEGIC_FRAMES.md (forecaster/oracle/gatekeeper frames)
T — S183 red-team consensus: build evaluator-first wedge (forecaster) — implies need to discriminate evaluator shapes from other shapes downstream

Proposer self-score

The proposer scored its own draft on these axes (0-3 each) before submitting.

Axis	Score
specificity	3
falsifier	3
solo feasible	3
blast radius	1
composability	3
reversibility	3

Disposition

Rejected at the council verdict. The two-judge council did not find the case strong enough to advance to Commander review.

Evaluation history

When	Move
2026-06-12 05:12	meta_council_verdict
2026-06-12 04:50	meta_argument
2026-06-12 04:11	meta_filter_score
2026-06-03 04:03	meta_genesis