features/provider_registry_coverage.feature

@@ -373,10 +373,33 @@ Feature: Provider Registry Coverage
     Given I have a ProviderRegistry with OpenAI API key set
     And CLEVERAGENTS_DEFAULT_MODEL is not set
     When I create an AI provider for provider "openai"
-    Then the provider registry AI provider should be a LangChainChatProvider
+    Then the provider registry AI provider should be an OpenAIChatProvider
     And the provider registry AI provider name should be "openai"
     And the provider registry AI provider model_id should be "gpt-4o"
 
+  @unit @providers @registry
+  Scenario: Create AI provider returns Anthropic adapter
+    Given I have a ProviderRegistry with Anthropic API key set
+    And CLEVERAGENTS_DEFAULT_MODEL is not set
+    When I create an AI provider for provider "anthropic"
+    Then the provider registry AI provider should be an AnthropicChatProvider
+    And the provider registry AI provider name should be "anthropic"
+    And the provider registry AI provider model_id should be "claude-sonnet-4-20250514"
+
+  @unit @providers @registry
+  Scenario: Create AI provider raises error when OpenAI API key is missing
+    Given I have a ProviderRegistry with no API keys
+    When I try to create an AI provider for provider "openai"
+    Then a provider registry ValueError should be raised
+    And the provider registry error should mention missing "OPENAI_API_KEY" environment variable
+
+  @unit @providers @registry
+  Scenario: Create AI provider raises error when Anthropic API key is missing
+    Given I have a ProviderRegistry with no API keys
+    When I try to create an AI provider for provider "anthropic"
+    Then a provider registry ValueError should be raised
+    And the provider registry error should mention missing "ANTHROPIC_API_KEY" environment variable
+
   @unit @providers @registry
   Scenario: Create AI provider returns Google adapter
     Given I have a ProviderRegistry with "google" API key set
@@ -401,7 +424,7 @@ Feature: Provider Registry Coverage
     And CLEVERAGENTS_DEFAULT_PROVIDER is not set
     And CLEVERAGENTS_DEFAULT_MODEL is not set
     When I create an AI provider without specifying a provider
-    Then the provider registry AI provider should be a LangChainChatProvider
+    Then the provider registry AI provider should be an OpenAIChatProvider
     And the provider registry AI provider name should be "openai"
 
 
@@ -414,11 +437,11 @@ Feature: Provider Registry Coverage
 
   @unit @providers @registry
   Scenario: AI provider exposes working llm factory
-    Given I have a ProviderRegistry with OpenAI API key set
+    Given I have a ProviderRegistry with "groq" API key set
     And the provider registry LLM factory is stubbed
-    When I create an AI provider for provider "openai"
-    And I call the AI provider llm factory with model "gpt-mini-cover"
-    Then the stubbed LLM factory should be called for ProviderType.OPENAI with model "gpt-mini-cover"
+    When I create an AI provider for provider "groq"
+    And I call the AI provider llm factory with model "llama-mini-cover"
+    Then the stubbed LLM factory should be called for ProviderType.GROQ with model "llama-mini-cover"
 
   @unit @providers @registry
   Scenario: ProviderCapabilities is immutable

features/steps/provider_registry_steps.py

@@ -9,8 +9,10 @@ from unittest.mock import MagicMock
 
 from behave import given, then, when  # type: ignore[import-untyped]
 
+from cleveragents.providers.llm.anthropic_provider import AnthropicChatProvider
 from cleveragents.providers.llm.google_provider import GoogleChatProvider
 from cleveragents.providers.llm.langchain_chat_provider import LangChainChatProvider
+from cleveragents.providers.llm.openai_provider import OpenAIChatProvider
 from cleveragents.providers.llm.openrouter_provider import OpenRouterChatProvider
 from cleveragents.providers.registry import (
     ProviderCapabilities,
@@ -781,6 +783,16 @@ def step_impl_ai_provider_is_langchain(context: Any) -> None:
     assert isinstance(context.ai_provider, LangChainChatProvider)
 
 
+@then("the provider registry AI provider should be an OpenAIChatProvider")
+def step_impl_ai_provider_is_openai(context: Any) -> None:
+    assert isinstance(context.ai_provider, OpenAIChatProvider)
+
+
+@then("the provider registry AI provider should be an AnthropicChatProvider")
+def step_impl_ai_provider_is_anthropic(context: Any) -> None:
+    assert isinstance(context.ai_provider, AnthropicChatProvider)
+
+
 @then("the provider registry AI provider should be a GoogleChatProvider")
 def step_impl_ai_provider_is_google(context: Any) -> None:
     assert isinstance(context.ai_provider, GoogleChatProvider)

src/cleveragents/providers/llm/__init__.py

@@ -0,0 +1,17 @@
+"""LLM provider adapters for CleverAgents.
+
+Exports all concrete LangChain-backed provider classes so that consumers can
+import them directly from the ``cleveragents.providers.llm`` subpackage.
+"""
+
+from cleveragents.providers.llm.anthropic_provider import AnthropicChatProvider
+from cleveragents.providers.llm.google_provider import GoogleChatProvider
+from cleveragents.providers.llm.openai_provider import OpenAIChatProvider
+from cleveragents.providers.llm.openrouter_provider import OpenRouterChatProvider
+
+__all__ = [
+    "AnthropicChatProvider",
+    "GoogleChatProvider",
+    "OpenAIChatProvider",
+    "OpenRouterChatProvider",
+]

src/cleveragents/providers/registry.py

@@ -600,6 +600,49 @@ class ProviderRegistry:
             provider_info.capabilities if provider_info else ProviderCapabilities()
         )
 
+        if provider_type == ProviderType.OPENAI:
+            from cleveragents.providers.llm.openai_provider import OpenAIChatProvider
+
+            key_attr = self.PROVIDER_KEY_ATTRS.get(provider_type)
+            api_key = getattr(self._settings, key_attr, None) if key_attr else None
+            if not api_key:
+                missing_env = (
+                    key_attr.upper() if key_attr else provider_type.value.upper()
+                )
+                raise ValueError(
+                    f"Provider {provider_type.value} is not configured. "
+                    f"Please set the {missing_env} environment variable."
+                )
+
+            return OpenAIChatProvider(
+                api_key=api_key,
+                model=model_id or self.DEFAULT_MODELS.get(provider_type, "gpt-4o"),
+                max_retries=max_retries,
+            )
+
+        if provider_type == ProviderType.ANTHROPIC:
+            from cleveragents.providers.llm.anthropic_provider import (
+                AnthropicChatProvider,
+            )
+
+            key_attr = self.PROVIDER_KEY_ATTRS.get(provider_type)
+            api_key = getattr(self._settings, key_attr, None) if key_attr else None
+            if not api_key:
+                missing_env = (
+                    key_attr.upper() if key_attr else provider_type.value.upper()
+                )
+                raise ValueError(
+                    f"Provider {provider_type.value} is not configured. "
+                    f"Please set the {missing_env} environment variable."
+                )
+
+            return AnthropicChatProvider(
+                api_key=api_key,
+                model=model_id
+                or self.DEFAULT_MODELS.get(provider_type, "claude-sonnet-4-20250514"),
+                max_retries=max_retries,
+            )
+
         if provider_type == ProviderType.GOOGLE:
             from cleveragents.providers.llm.google_provider import GoogleChatProvider