Model Catalog

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.

Live manifest URL

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.

Schema

{
  "version": 1,
  "updated_at": "2026-04-25T22:00:00Z",
  "metadata": {},
  "providers": {
    "openrouter": {
      "metadata": {},
      "models": [
        {"id": "moonshotai/kimi-k2.6", "description": "recommended", "metadata": {}},
        {"id": "openai/gpt-5.4",       "description": ""}
      ]
    },
    "nous": {
      "metadata": {},
      "models": [
        {"id": "anthropic/claude-opus-4.7"},
        {"id": "moonshotai/kimi-k2.6"}
      ]
    }
  }
}

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", or empty). Nous Portal doesn't use this — free-tier gating is determined live from the Portal's pricing endpoint.
• Pricing and context length are NOT in the manifest. Those come from live provider APIs (/v1/models endpoints, models.dev) at fetch time.

Fetch behavior

When	What happens
/model or hermes model	Fetches if disk cache is stale, else uses cache
Disk cache fresh (< TTL)	No network hit
Network failure with cache	Silent fallback to cache, one log line
Network failure, no cache	Silent fallback to in-repo snapshot
Manifest fails schema validation	Treated as unreachable

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

Config

model_catalog:
  enabled: true
  url: https://hermes-agent.nousresearch.com/docs/api/model-catalog.json
  ttl_hours: 24
  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.

Updating the manifest

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.