Six days after #23937 (608 fixes) the codebase had accumulated 241 new PLR6201 violations. Same mechanical `x in (...)` → `x in {...}` fix, same zero-risk profile: set lookup is O(1) vs O(n) for tuple and the two are semantically equivalent for hashable scalar membership tests. All 241 instances fixed via `ruff check --select PLR6201 --fix --unsafe-fixes`, zero remaining. Every changed value is a hashable scalar (str/int/None/enum/signal); no risk of unhashable runtime errors. No behavior change. Test plan: - 119 files changed, +244/-244 (net zero) — exactly one-line edits - `ruff check` clean afterward - Compile checks pass on the largest touched files (cli.py, run_agent.py, gateway/run.py, gateway/platforms/discord.py, model_tools.py) - Subset broad test run on tests/gateway/ tests/hermes_cli/ tests/agent/ tests/tools/: 18187 passed, 59 pre-existing failures (verified against origin/main with the same shape — identical failure count, identical category — all xdist test-order flakes unrelated to this change) Follows the same template as PR #23937 ([tracker: #23972](https://github.com/NousResearch/hermes-agent/issues/23972)).
Model Provider Plugins
Each subdirectory is a self-contained provider profile plugin. The
directory layout mirrors plugins/platforms/:
plugins/model-providers/
├── openrouter/
│ ├── __init__.py # registers the ProviderProfile
│ └── plugin.yaml # manifest: name, kind, version, description
├── anthropic/
│ ├── __init__.py
│ └── plugin.yaml
└── ...
How discovery works
providers/__init__.py._discover_providers() scans this directory (and
$HERMES_HOME/plugins/model-providers/) the first time anything calls
get_provider_profile() or list_providers(). Each __init__.py is
imported and expected to call providers.register_provider(profile).
User plugins at $HERMES_HOME/plugins/model-providers/<name>/ override
bundled plugins of the same name — last-writer-wins in
register_provider(). Drop a file there to replace a built-in.
Adding a new provider
-
Create
plugins/model-providers/<your_provider>/__init__.py:from providers import register_provider from providers.base import ProviderProfile my_provider = ProviderProfile( name="your-provider", aliases=("alias1", "alias2"), display_name="Your Provider", description="One-line description shown in the setup picker", signup_url="https://your-provider.example.com/keys", env_vars=("YOUR_PROVIDER_API_KEY", "YOUR_PROVIDER_BASE_URL"), base_url="https://api.your-provider.example.com/v1", default_aux_model="your-cheap-model", ) register_provider(my_provider) -
Create
plugins/model-providers/<your_provider>/plugin.yaml:name: your-provider-profile kind: model-provider version: 1.0.0 description: Short sentence about the provider author: Your Name
Nothing else needs to change. auth.py, config.py, models.py,
doctor.py, model_metadata.py, runtime_provider.py, and the
chat_completions transport all auto-wire from the registry.
Non-trivial profiles
Override the ProviderProfile hooks in a subclass for per-provider
quirks — see plugins/model-providers/openrouter/__init__.py for
build_extra_body and build_api_kwargs_extras examples, and
plugins/model-providers/gemini/__init__.py for thinking_config
translation.