Codex is the only harness today with native image generation
(image_gen) and the shipped impeccable_asset_producer subagent. The
detailed mock/palette/asset workflow only applies there. Inlining
it in craft.md made every non-Codex harness read past 49 lines of
instructions it can't act on, and weakened the Codex-specific
guidance by averaging it down to a cross-provider lowest common
denominator.
Split:
- New skill/reference/codex.md: Steps A-F covering direction
exploration, palette-first generation, mock generation against
confirmed palette, approval loop, mock-fidelity inventory, and
asset slicing via the impeccable_asset_producer subagent. Adds
the "palette first" forcing function that wasn't in craft.md
before; locking the palette before any mocks is what stops
generated comps from drifting.
- craft.md Step 3 is now a one-line conditional: if the harness has
native image generation, load codex.md and follow Steps A-F. If
not, state in one line that the step is being skipped because the
harness lacks native image generation, then proceed using the
brief as the visual reference. Same announcement-required pattern
as shape.md.
- craft.md Step 4 (asset extraction) is absorbed into codex.md
Step F. Steps renumber: 5 (build), 6 (iterate), 7 (present)
become 4, 5, 6.
Net: craft.md goes from 155 lines to 106 lines for non-Codex
providers. Codex gets a sharper 92-line image flow with the
palette-first gate that wasn't there before.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
