agentic-dev/docs/work/2026-05-14-library-evaluation-policy/07-generator-pre-shipped-traces/_story.md

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

id	epic	title	type	status	feature	depends-on	blocks
07-generator-pre-shipped-traces	2026-05-14-library-evaluation-policy	Generator templates — pre-shipped traces for optional core packages	technical-story	done	tooling	01-trace-schema-foundation

Goal

Update the five optional-core generator templates (events, realtime, audit, trpc, ui) so that when pnpm turbo gen core-package <name> runs, it copies pre-written decision: approved library traces into docs/library-decisions/ for every direct runtime dependency of that core package. Update the corresponding __snapshots__ files so the snapshot tests cover the new trace files.

Why

A developer who scaffolds an optional core via the generator should not immediately face a pre-commit failure for its bundled deps — the generator is the policy-compliant path, so the traces should land by construction. Without pre-shipped traces, the very act of using the generator would trigger the enforcement gate it's supposed to clear.

Done when

• Each of the five generator templates (turbo/generators/templates/core-package/{events,realtime,audit,trpc,ui}/) contains a docs/library-decisions/ subtree with one .md trace file per direct runtime dependency of that core, dated at generation time (use the template variable for date, or freeze to the scaffold date with a comment), decision: approved, and citing the relevant ADR (events → ADR-015, realtime → ADR-016, audit → ADR-018; trpc and ui cite their closest ADR or null if none).
• The generator copies these files into the workspace when run.
• The turbo/generators/__snapshots__/core-package/<name>.snapshot.json files are updated to include the new trace files; pnpm turbo gen core-package events (or any other optional core) passes the existing snapshot test.
• pnpm lint && pnpm fallow:audit pass.

In scope

• turbo/generators/templates/core-package/events/ — pre-shipped trace(s).
• turbo/generators/templates/core-package/realtime/ — pre-shipped trace(s).
• turbo/generators/templates/core-package/audit/ — pre-shipped trace(s).
• turbo/generators/templates/core-package/trpc/ — pre-shipped trace(s).
• turbo/generators/templates/core-package/ui/ — pre-shipped trace(s).
• Snapshot JSON updates for all five cores.
• Generator copy logic (if not already handled by the template mechanism).

Out of scope

• Backfill traces for already-installed optional cores in the live workspace — Story 08.
• Generator templates for non-core-package generators (feature, event, job, realtime, component) — no runtime deps are emitted by those generators.

Tasks

• Inventory the direct runtime deps of each of the five optional core generator templates (read each template's package.json); write one approved trace file per dep in the correct generator template subtree with ADR citation; update the five snapshot JSON files to include the new trace file entries; verify pnpm turbo gen core-package events (or equivalent dry-run) matches the updated snapshot; all gates pass on this single commit.