agentic-dev/docs/work/2026-05-14-library-evaluation-policy/05-human-guide/_story.md

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

id	epic	title	type	status	feature	depends-on	blocks
05-human-guide	2026-05-14-library-evaluation-policy	Human reading-room guide — docs/guides/adding-a-library.md	technical-story	done	docs	04-evaluate-library-skill	09-claude-md-update

Goal

Write docs/guides/adding-a-library.md — the human-readable guide explaining the library evaluation policy with worked examples (one approved, one rejected), the tier trigger, the four enforcement layers, and how to invoke the skill. The guide targets a maintainer reading the repo for the first time.

Why

ADR-022 is the source of truth but is written for decision-record density, not onboarding. The guide translates the policy into a narrative that answers "why does this exist?" and "what do I actually do?" before a developer encounters the pre-commit gate for the first time. Worked examples anchor the abstract filter list to concrete outcomes.

Done when

• docs/guides/adding-a-library.md exists with: (1) a "Why this exists" section explaining the uncodified-surface problem and the three signals from the PRD; (2) the tier trigger (feature/core packages require traces; app-tier does not; devdeps exempt); (3) the four enforcement layers (Claude hook → skill → pre-commit → sandcastle) in latency order; (4) step-by-step "how to add a library" walkthrough pointing at the /evaluate-library skill; (5) a worked approved example (brief — the full trace lives in EXAMPLES/ from Story 04); (6) a worked rejected example (trpc-to-openapi, named-consumer: fail); (7) a link to ADR-022 and docs/library-decisions/_template.md.
• pnpm lint && pnpm fallow:audit pass.

In scope

• docs/guides/adding-a-library.md — the guide document.

Out of scope

• The skill itself (Story 04) — already landed.
• CLAUDE.md update (Story 09) — that bullet points here and to ADR-022 but lands separately.
• Changing any existing guide or ADR.

Tasks

• Write docs/guides/adding-a-library.md with all seven sections from Done when (why, tier trigger, four layers, how-to walkthrough, worked approved + rejected examples, cross-links); all gates pass on this single commit.