Fast Lane baseline

What the April 2026 snapshot contains, how it's built, and how classification decisions are made against it.

What "Fast Lanes" refers to

Bethesda's April 2026 engine update introduced infrastructure changes that had subtle effects on some existing creations. The change was invisible at the API level — no bump in version numbers on unchanged content — but creations that did change around that time need closer scrutiny.

The baseline snapshot

The snapshot is a JSON file bundled with the toolkit release. It captures, for every creation in the Bethesda catalogue at a point-in-time just before the Fast Lanes rollout:

• Creation ID, title, author
• Version string
• Last-updated timestamp
• SHA-256 hash of the description text
• Category list

It's generated by the same offline scraper used for the text catalogue, run once against a frozen date.

Classification

When you Check a creation, the tool:

1. Looks up the creation in the baseline by ID. If not found → Unknown.
2. Applies the category refinement:
   • If any category is SAFE → Unaffected.
   • If any category is LOW_RISK and version/hash differ → Low risk.
3. Otherwise compares current remote version against baseline:
   • Same version, same hash → Not updated.
   • Version differs → Updated.
   • Version same but hash differs → Likely updated (description changed without a version bump).

Why hash, not just version

Some authors update a description (including changing load-order advice) without bumping the version number. Hashing the description text catches those cases — they'd be misclassified as Not updated under version-only comparison, but the author's advice has in fact changed and you should re-read it.

Why bundled, not live

The baseline is a fixed reference point — the state of the world just before the Fast Lanes update. Live-fetching would defeat the purpose: the baseline has to be stable and immutable to be a useful comparison target. Future toolkit releases may ship additional baselines (for later engine updates) but the April 2026 snapshot is the one that matters today.