Paul BakausandClaude Fable 5 6b3d174e93 skill v4.0.0-alpha.4: the lean core — full design guidance at a quarter the length ...

Pairwise evals on Fable one-shot (6-task regression set, opus-4-8 judge,
position-bias-cancelled): the hand-distilled ~55-line lean core beat the
heavy v4 core 66% overall / 67% craft head-to-head, and moved the
decisive win-rate vs frontend-design from 13% to 27% (40% with the
completion-time QA scan; craft went positive 6-5 for the first time).
18/18 lean samples ran context.mjs + palette.mjs vs a minority under the
heavy core: shorter instructions get followed. Context weight itself was
suppressing both compliance and boldness.

Structure: persona + brief-wins + existing-worlds + subject-grounding +
plan/self-check + boldness + prove-don't-claim + commit + calibration +
compressed craft floor + two-paragraph registers. Commands table kept;
the no-arg context-aware menu logic moved to reference/routing.md (read
on demand in the only case that is inherently interactive). Provider
blocks and rule anchors preserved.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-10 18:19:35 -07:00

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skills/impeccable

skill v4.0.0-alpha.4: the lean core — full design guidance at a quarter the length

2026-07-10 18:19:35 -07:00