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ymm-options

List year, make, model, trim, or variant options for cascading vehicle dropdowns using the CarsXE YMM Options API. Use this when the user wants available years, makes, models, trims, or which years a vehicle was sold — not full specs.

plugins/carsxe/carsxe-codex-plugin/skills/ymm-options/SKILL.md

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Nov 4, 2026

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Repository last updated
Nov 6, 2026
License
Apache-2.0

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When the user wants to browse available years, makes, models, trims, or variants (dropdowns, "what years was X sold", "which models does Toyota have in 2023"):

1. Make an HTTP GET request to the CarsXE YMM Options API. Include only filters the user provided:
   ```
   GET https://api.carsxe.com/v1/ymm-options?key={CARSXE_API_KEY}&source=codex_plugin[&dimension={DIMENSION}][&year={YEAR}][&make={MAKE}][&model={MODEL}][&trim={TRIM}]
   ```
   `dimension` is optional: `years` | `makes` | `models` | `trims` | `variants`.
   `make` is required for `dimension=models`. `model` is required for `dimension=trims`, and for `dimension=variants` unless both `year` and `make` are set. `trim` is a substring filter (ignored for years/makes/models).
2. If `dimension` is omitted, infer the next list: no filters → years; year → makes; make → models; make + model → variants.
3. Present the single returned list. Show `message` if present. For bulk variants (`dimension=variants` + year + make, no model), mention `modelCount` — that is the billed unit count — and warn before making that call.
4. Offer to fetch the next dropdown level or to run the `year-make-model` skill (`/v1/ymm`) for full specs of a chosen year/make/model.
5. If the API key is missing, tell the user to set the `CARSXE_API_KEY` environment variable (see AGENTS.md).