cleanup

llama_stack/core/datatypes.py

@@ -354,17 +354,11 @@ class AuthenticationRequiredError(Exception):
     pass
 
 
-class DefaultEmbeddingModel(BaseModel):
-    """Configuration for default embedding model."""
+class QualifiedModel(BaseModel):
+    """A qualified model identifier, consisting of a provider ID and a model ID."""
 
-    provider_id: str = Field(
-        ...,
-        description="ID of the inference provider that serves the embedding model (e.g., 'sentence-transformers').",
-    )
-    model_id: str = Field(
-        ...,
-        description="ID of the embedding model (e.g., 'nomic-ai/nomic-embed-text-v1.5').",
-    )
+    provider_id: str
+    model_id: str
 
 
 class VectorStoresConfig(BaseModel):
@@ -374,7 +368,7 @@ class VectorStoresConfig(BaseModel):
         default=None,
         description="ID of the vector_io provider to use as default when multiple providers are available and none is specified.",
     )
-    default_embedding_model: DefaultEmbeddingModel | None = Field(
+    default_embedding_model: QualifiedModel | None = Field(
         default=None,
         description="Default embedding model configuration for vector stores.",
     )

llama_stack/core/stack.py

@@ -35,7 +35,7 @@ from llama_stack.apis.telemetry import Telemetry
 from llama_stack.apis.tools import RAGToolRuntime, ToolGroups, ToolRuntime
 from llama_stack.apis.vector_io import VectorIO
 from llama_stack.core.conversations.conversations import ConversationServiceConfig, ConversationServiceImpl
-from llama_stack.core.datatypes import Provider, StackRunConfig
+from llama_stack.core.datatypes import Provider, StackRunConfig, VectorStoresConfig
 from llama_stack.core.distribution import get_provider_registry
 from llama_stack.core.inspect import DistributionInspectConfig, DistributionInspectImpl
 from llama_stack.core.prompts.prompts import PromptServiceConfig, PromptServiceImpl
@@ -139,45 +139,29 @@ async def register_resources(run_config: StackRunConfig, impls: dict[Api, Any]):
             )
 
 
-async def validate_vector_stores_config(run_config: StackRunConfig, impls: dict[Api, Any]):
+async def validate_vector_stores_config(vector_stores_config: VectorStoresConfig | None, impls: dict[Api, Any]):
     """Validate vector stores configuration."""
-    if not run_config.vector_stores:
+    if vector_stores_config is None:
         return
 
-    vector_stores_config = run_config.vector_stores
-
-    # Validate default embedding model if configured
-    if vector_stores_config.default_embedding_model:
     default_embedding_model = vector_stores_config.default_embedding_model
+    if default_embedding_model is None:
+        return
+
     provider_id = default_embedding_model.provider_id
     model_id = default_embedding_model.model_id
-        # Construct the full model identifier
     default_model_id = f"{provider_id}/{model_id}"
 
     if Api.models not in impls:
-            raise ValueError(
-                f"Models API is not available but vector_stores config requires model '{default_model_id}'"
-            )
+        raise ValueError(f"Models API is not available but vector_stores config requires model '{default_model_id}'")
 
     models_impl = impls[Api.models]
     response = await models_impl.list_models()
-        models_list = response.data if hasattr(response, "data") else response
+    models_list = {m.identifier: m for m in response.data if m.model_type == "embedding"}
 
-        # find default embedding model
-        default_model = None
-        for model in models_list:
-            if model.identifier == default_model_id:
-                default_model = model
-                break
-
-        if not default_model:
-            available_models = [m.identifier for m in models_list if m.model_type == "embedding"]
-            raise ValueError(
-                f"Embedding model '{default_model_id}' not found. Available embedding models: {available_models}"
-            )
-
-        if default_model.model_type != "embedding":
-            raise ValueError(f"Model '{default_model_id}' is type '{default_model.model_type}', not 'embedding'")
+    default_model = models_list.get(default_model_id)
+    if default_model is None:
+        raise ValueError(f"Embedding model '{default_model_id}' not found. Available embedding models: {models_list}")
 
     embedding_dimension = default_model.metadata.get("embedding_dimension")
     if embedding_dimension is None:
@@ -190,8 +174,6 @@ async def validate_vector_stores_config(run_config: StackRunConfig, impls: dict[
 
     logger.debug(f"Validated default embedding model: {default_model_id} (dimension: {embedding_dimension})")
 
-    # If no default embedding model is configured, that's fine - validation passes
-
 
 class EnvVarError(Exception):
     def __init__(self, var_name: str, path: str = ""):
@@ -429,7 +411,7 @@ class Stack:
 
         await register_resources(self.run_config, impls)
         await refresh_registry_once(impls)
-        await validate_vector_stores_config(self.run_config, impls)
+        await validate_vector_stores_config(self.run_config.vector_stores, impls)
         self.impls = impls
 
     def create_registry_refresh_task(self):

llama_stack/distributions/starter/starter.py

@@ -9,9 +9,9 @@ from typing import Any
 
 from llama_stack.core.datatypes import (
     BuildProvider,
-    DefaultEmbeddingModel,
     Provider,
     ProviderSpec,
+    QualifiedModel,
     ShieldInput,
     ToolGroupInput,
     VectorStoresConfig,
@@ -251,7 +251,7 @@ def get_distribution_template(name: str = "starter") -> DistributionTemplate:
                 default_shields=default_shields,
                 vector_stores_config=VectorStoresConfig(
                     default_provider_id="faiss",
-                    default_embedding_model=DefaultEmbeddingModel(
+                    default_embedding_model=QualifiedModel(
                         provider_id="sentence-transformers",
                         model_id="nomic-ai/nomic-embed-text-v1.5",
                     ),

tests/unit/core/test_stack_validation.py

@@ -11,7 +11,7 @@ from unittest.mock import AsyncMock
 import pytest
 
 from llama_stack.apis.models import Model, ModelType
-from llama_stack.core.datatypes import DefaultEmbeddingModel, StackRunConfig, StorageConfig, VectorStoresConfig
+from llama_stack.core.datatypes import QualifiedModel, StackRunConfig, StorageConfig, VectorStoresConfig
 from llama_stack.core.stack import validate_vector_stores_config
 from llama_stack.providers.datatypes import Api
 
@@ -25,7 +25,7 @@ class TestVectorStoresValidation:
             storage=StorageConfig(backends={}, stores={}),
             vector_stores=VectorStoresConfig(
                 default_provider_id="faiss",
-                default_embedding_model=DefaultEmbeddingModel(
+                default_embedding_model=QualifiedModel(
                     provider_id="p",
                     model_id="missing",
                 ),
@@ -45,7 +45,7 @@ class TestVectorStoresValidation:
             storage=StorageConfig(backends={}, stores={}),
             vector_stores=VectorStoresConfig(
                 default_provider_id="faiss",
-                default_embedding_model=DefaultEmbeddingModel(
+                default_embedding_model=QualifiedModel(
                     provider_id="p",
                     model_id="valid",
                 ),