providers/

Registry and ABC for every inference provider Hermes knows about.

Each provider is declared once as a ProviderProfile. Every other layer — auth resolution, transport kwargs, model listing, runtime routing — reads from these profiles instead of maintaining its own parallel data.

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Layout

providers/
├── base.py         ProviderProfile dataclass + OMIT_TEMPERATURE sentinel
├── __init__.py     Registry: register_provider(), get_provider_profile(), list_providers()
└── README.md       This file

The profiles themselves live as plugins under plugins/model-providers/<name>/ (bundled in this repo) and $HERMES_HOME/plugins/model-providers/<name>/ (per-user overrides). The registry in providers/__init__.py lazily discovers them the first time any consumer calls get_provider_profile() or list_providers(). See plugins/model-providers/README.md for the plugin contract and examples.

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How it wires in

The registry is populated on first access. After that, every downstream layer reads from it:

• hermes_cli/auth.py extends PROVIDER_REGISTRY with every api-key profile it sees (skipping copilot, kimi-coding, kimi-coding-cn, zai, openrouter, custom — those need bespoke token resolution).
• hermes_cli/models.py extends CANONICAL_PROVIDERS and calls profile.fetch_models() inside provider_model_ids().
• hermes_cli/doctor.py adds a /models health check for each auth_type="api_key" profile.
• hermes_cli/config.py injects every env_var into OPTIONAL_ENV_VARS so the setup wizard knows about it.
• hermes_cli/runtime_provider.py reads profile.api_mode as a fallback when URL detection finds nothing.
• agent/model_metadata.py maps hostname → provider via profile.get_hostname().
• agent/auxiliary_client.py reads profile.default_aux_model first before falling back to the legacy hardcoded dict.
• agent/transports/chat_completions.py::_build_kwargs_from_profile() invokes profile.prepare_messages(), profile.build_extra_body(), and profile.build_api_kwargs_extras() on every call.
• run_agent.py passes provider_profile=<ProviderProfile> so the transport takes the profile path instead of the legacy flag path.

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Adding a provider

See plugins/model-providers/README.md — drop a new directory there (or under $HERMES_HOME/plugins/model-providers/ for a private plugin).

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Hooks you can override on ProviderProfile

Hook	Purpose
get_hostname()	URL-based detection — default derives from base_url.
prepare_messages(msgs)	Provider-specific message preprocessing (Qwen normalises to list-of-parts, injects cache_control).
build_extra_body(**ctx)	Provider-specific extra_body (OpenRouter provider prefs, Gemini thinking_config).
build_api_kwargs_extras(**ctx)	(extra_body_additions, top_level_kwargs) — Kimi puts reasoning_effort top-level, Qwen splits enable_thinking/thinking_budget.
fetch_models(*, api_key)	Live catalog fetch — default hits {models_url or base_url}/models with Bearer auth. Override for no-REST providers (Bedrock), OAuth catalogs (Anthropic), or public catalogs (OpenRouter).

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Configuration fields

Full reference in providers/base.py dataclass definition.