DataDesigner/docs/concepts/models/model-providers.md
Nabin Mulepati f73da1975c
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feat(models): deprecate implicit default provider routing (#594)
* feat(models): deprecate implicit default provider routing

Emit DeprecationWarning whenever the legacy "implicit default
provider" path is exercised: `ModelConfig.provider=None`, the
registry-level `ModelProviderRegistry.default`, the YAML
`default:` key in `~/.data-designer/model_providers.yaml`, and
the CLI's "Change default provider" workflow.

`resolve_model_provider_registry` skips passing `default=` in the
single-provider case so the common construction path stays quiet.
Multi-provider registries still pass `default` (per
`check_implicit_default`) and warn accordingly.

Update docs, the package README, and test fixtures to specify
`provider=` explicitly on every `ModelConfig`. New tests cover
each warning entry point and pin the post-deprecation happy paths.

Refs #589

Made-with: Cursor

* fix(models): address PR #594 review feedback

Greptile P1: ProviderRepository.load emitted its DeprecationWarning
inside a `try/except Exception` block. Under
`filterwarnings("error", DeprecationWarning)` the warn would raise,
the except would swallow it, and `load()` would silently return None
(losing the registry). Move the warn outside the catch-all so the
strict-warning path no longer drops valid configs.

Greptile P2 / johnnygreco: `_warn_on_implicit_provider` and
`_warn_on_explicit_default` use `stacklevel=2`, which lands inside
pydantic v2's validator dispatch rather than at the user's
`ModelConfig(...)` / `ModelProviderRegistry(...)` call. That broke
both attribution (the source line was unhelpful) and Python's
once-per-location dedup (every call collapsed to the same
pydantic-internal key, suppressing all but the first warning).
Introduce `data_designer.config.utils.warning_helpers.warn_at_caller`,
which walks past the helper, validator, and any pydantic frames to
find the user's call site and emits via `warnings.warn_explicit` with
the user frame's `__warningregistry__`. Keeps attribution accurate
and dedup keyed on the user's (filename, lineno).

johnnygreco: align the `provider_repository.py` warning copy with the
sibling site in `default_model_settings.py` ("specify provider=
explicitly on each ModelConfig instead") so both YAML-default warning
sites give the same migration instruction. The previous wording
pointed users at "ModelConfig entries" inside `model_providers.yaml`,
where ModelConfig entries don't actually live.

johnnygreco: dedup the cascade in `DataDesigner.__init__`. With
`model_providers=None` and a YAML `default:`, the user previously saw
two DeprecationWarnings for the same root cause —
`get_default_provider_name()` warns about the YAML key, then
`resolve_model_provider_registry(...)` re-warns from
`_warn_on_explicit_default`. Suppress the registry-level duplicate in
the YAML-fallback branch via `warnings.catch_warnings()` so users see
exactly one warning per user action.

johnnygreco: tighten `_warn_on_explicit_default` to fire only when
`default is not None`. Passing `default=None` explicitly is
semantically equivalent to omitting it (caller is opting *out* of a
registry-level default), and shouldn't trigger the deprecation
nudge.

johnnygreco: add a `model_validate({...})` regression test for
`ModelConfig` so the deserialization path (legacy on-disk configs)
is pinned alongside the construction path.

Tests:
- Update `test_load_exists` and `test_save` to omit `default=` so the
  roundtrip stops exercising the deprecated YAML-default path
  unguarded (Greptile note).
- Wrap `test_resolve_model_provider_registry_with_explicit_default`,
  `test_get_provider`, and
  `test_init_user_supplied_providers_preserve_first_wins_over_yaml_default`
  in `pytest.warns` so the suite stays green under
  `-W error::DeprecationWarning` (Greptile note).
- Add `test_explicit_default_none_does_not_emit_deprecation_warning`
  to pin the tightened predicate.
- Add `test_init_yaml_default_emits_single_deprecation_warning` to
  pin the cascade-dedup behavior.

Refs #589

Made-with: Cursor

* fix(models): make deprecation warnings visible under default filters

andreatgretel (PR #594): the YAML-default warning in
`get_default_provider_name` and the registry-default warning emitted
from inside DataDesigner helpers were attributing to data_designer
library frames, not user code. Python's default filter chain includes
`ignore::DeprecationWarning`, so library-attributed entries are
silenced — meaning a normal `DataDesigner()` call with a YAML
`default:` set showed nothing, and `resolve_model_provider_registry`
warnings were similarly invisible. Two related changes:

1. `warn_at_caller`: extend the default skip-list from `("pydantic",)`
   to `("pydantic", "pydantic_core", "data_designer")` so the walk
   escapes both pydantic's validator-dispatch frames and data_designer
   helper frames before attributing. Also tighten the prefix predicate
   to exact-or-dotted-prefix matching (`name == p or
   name.startswith(p + ".")`) so e.g. `pydantic_helpers` is not
   falsely matched as part of `pydantic` (johnnygreco nit). Allow
   callers to pass a custom `skip_prefixes` for flexibility. Drop the
   "skip frame 0+1 unconditionally" guard now that prefix matching
   covers it.

2. `get_default_provider_name`: switch from
   `warnings.warn(stacklevel=2)` to `warn_at_caller`. The previous
   stacklevel pointed into `default_model_settings.py`, which is a
   library file → silenced under default filters. Verified the fix
   empirically with `python -W default`: warning is now attributed to
   the user's call site and rendered.

johnnygreco (PR #594): add the missing
`test_explicit_default_none_does_not_emit_deprecation_warning`
regression for the `self.default is not None` predicate landed in
the prior round.

Tests:
- New `test_warning_helpers.py` pins prefix-matching precision
  (rejects `pydantic_helpers` / `data_designer_other`), default
  skip-list contents, attribution past skip-prefix frames, and
  per-call-site dedup behavior.
- `test_get_default_provider_name_warning_attributes_to_user_frame`
  pins andreatgretel's repro for the YAML-default site.
- `test_explicit_default_warning_attributes_to_user_frame` pins the
  multi-frame case: construction goes through
  `resolve_model_provider_registry`, so the walk has to escape both
  pydantic and data_designer before landing on the test file.
- `test_explicit_default_none_does_not_emit_deprecation_warning`
  pins johnnygreco's predicate-tightening regression.

3,124 tests pass (540 config + 1,923 engine + 653 interface; +10 net
from this round).

Refs #589

Made-with: Cursor

* fix(models): apply warn_at_caller to remaining deprecation sites

greptile-apps (PR #594, r3189904028): `ProviderRepository.load`'s
YAML-default `DeprecationWarning` was using `warnings.warn(stacklevel=2)`,
which attributes to whichever data_designer frame called `load()` —
controllers, services, list/reset commands, agent introspection. Every
real call path lands on `data_designer.cli.*`, which falls under
Python's default `ignore::DeprecationWarning` filter and is silenced.
Audit found two more sites with the same problem:

- `DatasetBuilder._resolve_async_compatibility` (`allow_resize` /
  issue #552) — was using `stacklevel=4` to walk past
  `_resolve_async_compatibility -> build/build_preview -> interface ->
  user`. Brittle: any added frame (decorator, async wrapping, the
  `try/except DeprecationWarning: raise` boundary) shifts attribution
  silently. The existing test passed only because it used
  `simplefilter("always") + record=True`, which records warnings
  regardless of attribution.
- `ProviderController._handle_change_default` — was using
  `stacklevel=2`, which lands on the menu dispatcher in the same
  controller module. `print_warning` already shows the message
  visually, but programmatic observers (`pytest.warns`,
  `filterwarnings("error", ...)`) saw a library-attributed entry that
  default filters silenced.

All three migrated to `warn_at_caller` (the helper from 247fa30) so
attribution lands on the user's call site regardless of internal
chain shape. `data_designer` is already in
`DEFAULT_INTERNAL_PREFIXES`, so the walk escapes the entire library
in one pass.

Added attribution regression tests at each site asserting
`warning.filename == __file__`. A future regression to
`warnings.warn(stacklevel=N)` now fails CI instead of silently
silencing the user-facing nudge:

- `test_load_with_yaml_default_attributes_warning_to_caller`
  (test_provider_repository.py)
- `test_resolve_async_compatibility` extended with the same assertion
- `test_handle_change_default_emits_deprecation_warning` rewritten
  from `pytest.warns(...)` to a `catch_warnings(record=True)` block
  that filters for the message and asserts `filename == __file__`
  (`pytest.warns` does not check attribution, so the rewrite is
  required to actually catch the regression).

3,125 tests pass (548 config + 1,923 engine + 654 interface).

Refs #589
2026-05-05 13:39:12 -06:00

4.5 KiB

Model Providers

Model providers are external services that host and serve models. Data Designer uses the ModelProvider class to configure connections to these services.

Overview

A ModelProvider defines how Data Designer connects to a provider's API endpoint. When you create a ModelConfig, you reference a provider by name, and Data Designer uses that provider's settings to make API calls to the appropriate endpoint.

!!! warning "Deprecated: implicit default provider routing" Earlier versions of Data Designer let you omit provider= on ModelConfig and fall back to a registry-level default — including the default: key in ~/.data-designer/model_providers.yaml. That implicit routing is deprecated and will be removed in a future release. Always reference a provider by name on every ModelConfig. A DeprecationWarning is now emitted when the legacy path is exercised. See issue #589.

ModelProvider Configuration

The ModelProvider class has the following fields:

Field Type Required Description
name str Yes Unique identifier for the provider (e.g., "nvidia", "openai", "openrouter")
endpoint str Yes API endpoint URL (e.g., "https://integrate.api.nvidia.com/v1")
provider_type str No Provider type: "openai" (default) or "anthropic". See Supported Provider Types below
api_key str No API key or environment variable name (e.g., "NVIDIA_API_KEY")
extra_body dict[str, Any] No Additional parameters to include in the request body of all API requests to the provider.
extra_headers dict[str, str] No Additional headers to include in all API requests to the provider.

Supported Provider Types

Data Designer supports two provider types:

Type Description
"openai" OpenAI-compatible chat completion API. This is the default and works with most providers, including NVIDIA NIM, vLLM, TGI, OpenRouter, Together AI, and OpenAI itself.
"anthropic" Anthropic's native Messages API for Claude models. Use this when connecting directly to Anthropic's API.

Most self-hosted and third-party endpoints expose an OpenAI-compatible API, so provider_type="openai" is the right choice in the majority of cases. Only use "anthropic" when connecting directly to Anthropic's API at https://api.anthropic.com.

Note: Previous versions of Data Designer supported additional provider types (e.g., "azure", "bedrock", "vertex_ai") via a LiteLLM bridge. These are no longer supported. If you were using one of these types, switch to provider_type="openai" and point the endpoint to an OpenAI-compatible proxy or gateway for that service.

API Key Configuration

The api_key field can be specified in two ways:

  1. Environment variable name (recommended): Set api_key to the name of an environment variable (e.g., "NVIDIA_API_KEY"). Data Designer will automatically resolve it at runtime.

  2. Plain-text value: Set api_key to the actual API key string. This is less secure and not recommended for production use.

# Method 1: Environment variable (recommended)
provider = ModelProvider(
    name="nvidia",
    endpoint="https://integrate.api.nvidia.com/v1",
    api_key="NVIDIA_API_KEY",  # Will be resolved from environment
)

# Method 2: Direct value (not recommended)
provider = ModelProvider(
    name="nvidia",
    endpoint="https://integrate.api.nvidia.com/v1",
    api_key="nvapi-abc123...",  # Direct API key
)

See Also