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Hermes fetches curated model lists for OpenRouter and Nous Portal from a JSON manifest hosted alongside the docs site. This lets maintainers update picker lists without shipping a new hermes-agent release.

When the manifest is unreachable (offline, network blocked, hosting failure), Hermes silently falls back to the in-repo snapshot that ships with the CLI. The manifest never breaks the picker — worst case you see whatever list was bundled with your installed version.

https://hermes-agent.nousresearch.com/docs/api/model-catalog.json

Published on every merge to main via the existing deploy-site.yml GitHub Pages pipeline. The source of truth lives in the repo at website/static/api/model-catalog.json.

{
  "version": 1,
  "updated_at": "2026-04-25T22:00:00Z",
  "metadata": {},
  "providers": {
    "openrouter": {
      "metadata": {},
      "models": [
        {"id": "z-ai/glm-5.2",         "description": "default", "default": true},
        {"id": "moonshotai/kimi-k3",   "description": "recommended", "metadata": {}},
        {"id": "openai/gpt-5.4",       "description": ""}
      ]
    },
    "nous": {
      "metadata": {},
      "models": [
        {"id": "z-ai/glm-5.2", "default": true},
        {"id": "anthropic/claude-opus-4.7"},
        {"id": "moonshotai/kimi-k3"}
      ]
    }
  }
}

Field notes:

• version — integer schema version. Future schemas bump this; Hermes refuses manifests with versions it doesn't understand and falls back to the hardcoded snapshot.
• metadata — free-form dict at the manifest, provider, and model level. Any keys. Hermes ignores unknown fields, so you can annotate entries ("tier": "paid", "tags": [...], etc.) without coordinating a schema change.
• description — OpenRouter-only. Drives picker badge text ("recommended", "free", "default", or empty). Nous Portal doesn't use this — free-tier gating is determined live from the Portal's pricing endpoint.
• default — exactly one entry per provider may carry "default": true. That model is the silent default: what Hermes lands on when the user never selected a model (GUI onboarding confirm card, provider configured with no model, empty model.default). Read cache-only at runtime (get_default_model_from_cache) so hot resolution paths never hit the network; when no cached manifest exists, Hermes falls back to the in-repo PREFERRED_SILENT_DEFAULT_MODEL constant, which must match the labeled entry. This lets maintainers rotate the silent default without shipping a release. It is deliberately a capable low-cost model, never the priciest flagship.
• Pricing and context length are NOT in the manifest. Those come from live provider APIs (/v1/models endpoints, models.dev) at fetch time.

Cache location: ~/.hermes/cache/model_catalog.json.

model_catalog:
  enabled: true
  url: https://hermes-agent.nousresearch.com/docs/api/model-catalog.json
  ttl_hours: 1
  providers: {}

Set enabled: false to disable remote fetch entirely and always use the in-repo snapshot.

Per-provider override URLs

Third parties can self-host their own curation list using the same schema. Point a provider at a custom URL:

model_catalog:
  providers:
    openrouter:
      url: https://example.com/my-openrouter-curation.json

The overriding manifest only needs to populate the provider block(s) it cares about. Other providers continue to resolve against the master URL.

Hiding providers from the picker

excluded_providers lets you hide specific providers from the /model picker even when valid credentials exist. Useful when credentials are present for legacy or testing providers that shouldn't appear in normal use (e.g. an old Copilot or OpenRouter token still cached in auth.json or discovered via the gh CLI).

model_catalog:
  excluded_providers:
    - copilot
    - openrouter
    - openai

The exclusion is matched case-insensitively against every key a provider can surface under — the Hermes id and models.dev id (built-in mapped providers), the overlay pid and resolved Hermes slug (overlay providers), and the canonical slug (canonical providers) — so a single entry like copilot hides the provider regardless of which section emits it. It is honored by every /model picker surface: the gateway interactive/text pickers, the TUI picker, and the interactive hermes model CLI picker. An empty list (or omitting the key) has no effect.

Maintainers:

# Re-generate from the in-repo hardcoded lists (keeps manifest in sync after
# editing OPENROUTER_MODELS or _PROVIDER_MODELS["nous"] in hermes_cli/models.py).
python scripts/build_model_catalog.py

Then PR the resulting change to website/static/api/model-catalog.json to main. The docs site auto-deploys on merge and the new manifest is live within a few minutes.

You can also hand-edit the JSON directly for fine-grained metadata changes that don't belong in the in-repo snapshot — the generator script is a convenience, not the single source of truth.