office-open-xml-viewer: Skill for Codex

DOCX Architecture Audit

Audit semantics that static identifier checks cannot prove. Report only evidence-backed findings with an exact code reference or a reproducible command.

Workflow

1. Read AGENTS.md and docs/docx-layout-engine-redesign.md completely.

2. Inspect the complete change against main; do not limit review to the latest commit. Read the owning modules and focused tests, not only the diff.

3. Consult the relevant local spec/ material before judging OOXML behavior. Prefer ECMA-376 / ISO/IEC 29500, then the applicable Microsoft implementation note. Do not disclose private sample contents or paths.

4. Run the deterministic gates:

   mise exec -- node scripts/check-docx-layout-boundaries.mjs --final
   mise exec -- pnpm test:docx-boundaries
   mise exec -- pnpm test:docx-compatibility
   mise exec -- pnpm test:docx-public-api
   mise exec -- pnpm test:docx-package-build
   mise exec -- pnpm typecheck
   git diff --check
   

5. Audit the final dependency direction and runtime behavior:

   • one production layout algorithm exists for each supported feature class;
   • parser facts flow into immutable point-space layout and then measurement-free paint;
   • paint performs no measurement, shaping, style resolution, pagination, or parser-model access, including through transitive imports;
   • parser objects and retained layouts are not mutated or runtime-stamped;
   • no migration flag, silent legacy fallback, dry-render geometry collection, or transitional allowance remains;
   • body, stories, tables, text boxes, and supported floating content participate in DocumentLayout and preserve page/layer ownership;
   • main and worker use the same contracts and stable layout fingerprints;
   • compatibility decisions are isolated with exact evidence, while normative rules and unsupported diagnostics are not mislabeled as observations;
   • renderer.ts remains a thin adapter with no hidden layout or paint algorithm;
   • public declarations remain compatible;
   • shared OOXML primitives live in core or ooxml-common only when the abstraction is genuinely cross-format.