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

## 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.