Nexus model updates

Each provider keeps a static model catalog at src/services/llm/adapters/<provider>/<Provider>Models.ts: an array of ModelSpec literals plus a *_DEFAULT_MODEL export. Two aggregators read those arrays, and between them they decide what the model picker offers, what a call costs, and which UI affordances appear.

Nothing here holds model ids, prices, context windows or provider lists — the registries are the truth and they change weekly. This skill holds the procedure and the checks. To see what the tree currently declares:

python3 .claude/skills/nexus-model-updates/scripts/check_model_registry.py \
  --repo-root . --list

Workflow

1. A model in a provider that already has a registry — follow protocols/add-model.md. Get every number from the provider's own source; values carried over from another gateway's entry are wrong more often than they are right.
2. Moving a provider's default — follow protocols/change-default.md. The default is written in several independent places and TypeScript checks none of them against each other, so you MUST work that protocol rather than editing the one you happened to find.
3. A provider with no registry yet — follow protocols/add-provider-registry.md. Adapter wiring belongs to nexus-llm-adapters; only the catalog and its aggregator entries are yours.
4. An image generation model — follow protocols/add-image-model.md. Image models live in the image adapters' own catalogs, not in <Provider>Models.ts, the structural gate does not see them, and the committed tool catalogs embed their enum.
5. Before calling any of the above done — run protocols/verify-model.md. You MUST get a zero exit from scripts/check_model_registry.py --repo-root . <provider>, and you MUST NOT report a model as working on the strength of a registry entry: the entry is a claim about an id, and only a live call tests it.
6. End of a session that used this skill — run protocols/self-refine.md.

Map

• protocols/ the procedures: add-model, add-image-model, change-default, add-provider-registry, verify-model, self-refine.
• references/ mechanism, read on demand: registry-anatomy.md (what a ModelSpec field means and how to fill it), consumers.md (who reads the registries and what silently breaks when metadata is wrong), smoke-harness.md (the live provider smoke lane in detail).
• scripts/check_model_registry.py — the structural gate: required fields, provider/directory agreement, unreachable duplicate ids, defaults that point at nothing, adapter literals that drifted from the registry, and registries wired into one aggregator but not the other. Run it; do not re-derive it by reading source.

Siblings — do not duplicate them here

• nexus-llm-adapters owns adapter wiring: transport, streaming, reasoning rendering, and the provider registration points outside the model catalog.
• nexus-model-eval owns grading a model on Nexus tool use. A smoke test proves the id returns text; it proves nothing about tool calling, and a model that passes smoke can still be unusable in chat.
• nexus-eval-harness owns running and changing the eval harness itself.
• nexus-testing owns which Jest lane to use and what a mock can prove.

Refine

At the end of a session that used this skill, run protocols/self-refine.md and append to refinement-log.md.