**Config layout changed upstream.** NLWeb replaced the single `site_types.xml` with two files in `config/`: > **`sites.xml`** (site name → `itemType` list + description) and **`tools.xml`** (per-site / per-type tool > definitions, prompts and examples, scoped by `<Site id="…">` / `<Item>` blocks). Older guidance — including any > `site_type` / `extends` inheritance syntax — describes the retired file. **Fetch `config/sites.xml` and > `config/tools.xml` from the live repo before editing anything.**
