agentic-dev/docs/work/2026-05-14-library-evaluation-policy/01-trace-schema-foundation/_story.md

id, epic, title, type, status, feature, depends-on, blocks

id	epic	title	type	status	feature	depends-on	blocks
01-trace-schema-foundation	2026-05-14-library-evaluation-policy	Trace schema module + docs/library-decisions/ foundation	technical-story	done	scripts		02-pre-commit-check-script 04-evaluate-library-skill 07-generator-pre-shipped-traces 08-backfill-traces

Goal

Create the shared Zod-validated trace-schema module (scripts/library-decisions/schema.mjs) that every enforcement layer imports, and establish docs/library-decisions/ with a _template.md schema reference that documents the required frontmatter + heading shape for all future traces.

Why

All four enforcement layers (skill, pre-commit check, generator templates, sandcastle reviewer) need a single authoritative definition of what a valid library trace looks like. Without a shared module, each layer would re-implement the parse/validate logic independently and drift. The _template.md gives human contributors and agents a copy-pasteable starting point.

Done when

• scripts/library-decisions/schema.mjs exists and exports: (1) a Zod schema validating the full trace frontmatter (all fields from ADR-022 §4 including nested filter-results object), (2) a parseTrace(filePath) function that reads + validates a .md file's frontmatter, (3) a validateTrace(raw) function for validating already-parsed objects.
• scripts/library-decisions/schema.test.mjs covers: valid trace round-trips without error; missing required field throws; unknown filter key rejected; invalid enum value rejected; accepted-cves optional field accepted.
• docs/library-decisions/_template.md exists with the complete frontmatter schema (all fields, all enums documented) and all required section headings (## Filter: <name> × 8 + ## Prompt: <name> × 3) in the machine-checkable order from ADR-022.
• docs/library-decisions/ directory is committed (can be just _template.md + .gitkeep if no traces yet).
• pnpm typecheck && pnpm lint && pnpm test && pnpm conformance && pnpm fallow:audit && pnpm coverage:diff all pass.

In scope

• scripts/library-decisions/schema.mjs — Zod schema + parse/validate exports.
• scripts/library-decisions/schema.test.mjs — unit tests (vitest or node:test; match the pattern used by scripts/work/ tests).
• docs/library-decisions/_template.md — schema reference document.

Out of scope

• The pre-commit check script (check.mjs) — Story 02.
• The skill itself — Story 04.
• Actual trace files (backfill) — Story 08.
• Generator template changes — Story 07.

Tasks

• Create scripts/library-decisions/schema.mjs with Zod frontmatter schema (all fields from ADR-022 §4: package, version, tier, decision, date, deciders, adr, filter-results nested object with all 8 filter keys and their enum values, verification-commands, accepted-cves optional), plus parseTrace(filePath) and validateTrace(raw) exports; write schema.test.mjs covering valid round-trip, missing-field rejection, invalid-enum rejection, and optional accepted-cves; create docs/library-decisions/_template.md with full frontmatter schema + all 11 required headings in ADR-022 order; all gates pass on this single commit.