feat!: Remove public disabled() classmethod from AIConfigDefault

The disabled() factory on AIConfigDefault and subclasses created
configs without tracker factories, breaking the spec requirement.
Replace with private module-level constants in client.py, matching
how js-core handles disabled configs as an internal concern.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jsonbailey

packages/sdk/server-ai/src/ldai/client.py

@@ -45,6 +45,10 @@
 
 _INIT_TRACK_CONTEXT = Context.builder('ld-internal-tracking').kind('ld_ai').anonymous(True).build()
 
+_DISABLED_COMPLETION_DEFAULT = AICompletionConfigDefault(enabled=False)
+_DISABLED_AGENT_DEFAULT = AIAgentConfigDefault(enabled=False)
+_DISABLED_JUDGE_DEFAULT = AIJudgeConfigDefault(enabled=False)
+
 
 class LDAIClient:
     """The LaunchDarkly AI SDK client object."""
@@ -121,7 +125,7 @@ def completion_config(
         self._client.track(_TRACK_USAGE_COMPLETION_CONFIG, context, key, 1)
 
         return self._completion_config(
-            key, context, default or AICompletionConfigDefault.disabled(), variables
+            key, context, default or _DISABLED_COMPLETION_DEFAULT, variables
         )
 
     def config(
@@ -205,7 +209,7 @@ def judge_config(
         self._client.track(_TRACK_USAGE_JUDGE_CONFIG, context, key, 1)
 
         return self._judge_config(
-            key, context, default or AIJudgeConfigDefault.disabled(), variables
+            key, context, default or _DISABLED_JUDGE_DEFAULT, variables
         )
 
     async def create_judge(
@@ -263,7 +267,7 @@ async def create_judge(
             extended_variables['response_to_evaluate'] = '{{response_to_evaluate}}'
 
             judge_config = self._judge_config(
-                key, context, default or AIJudgeConfigDefault.disabled(), extended_variables
+                key, context, default or _DISABLED_JUDGE_DEFAULT, extended_variables
             )
 
             if not judge_config.enabled:
@@ -361,7 +365,7 @@ async def create_model(
         """
         self._client.track(_TRACK_USAGE_CREATE_MODEL, context, key, 1)
         log.debug(f"Creating managed model for key: {key}")
-        config = self._completion_config(key, context, default or AICompletionConfigDefault.disabled(), variables)
+        config = self._completion_config(key, context, default or _DISABLED_COMPLETION_DEFAULT, variables)
 
         if not config.enabled:
             return None
@@ -444,7 +448,7 @@ async def create_agent(
         """
         self._client.track(_TRACK_USAGE_CREATE_AGENT, context, key, 1)
         log.debug(f"Creating managed agent for key: {key}")
-        config = self.__evaluate_agent(key, context, default or AIAgentConfigDefault.disabled(), variables)
+        config = self.__evaluate_agent(key, context, default or _DISABLED_AGENT_DEFAULT, variables)
 
         if not config.enabled:
             return None
@@ -501,7 +505,7 @@ def agent_config(
         )
 
         return self.__evaluate_agent(
-            key, context, default or AIAgentConfigDefault.disabled(), variables
+            key, context, default or _DISABLED_AGENT_DEFAULT, variables
         )
 
     def agent(
@@ -575,7 +579,7 @@ def agent_configs(
             agent = self.__evaluate_agent(
                 config.key,
                 context,
-                config.default or AIAgentConfigDefault.disabled(),
+                config.default or _DISABLED_AGENT_DEFAULT,
                 config.variables
             )
             result[config.key] = agent

packages/sdk/server-ai/src/ldai/models.py

@@ -150,14 +150,6 @@ class AIConfigDefault:
     model: Optional[ModelConfig] = None
     provider: Optional[ProviderConfig] = None
 
-    @classmethod
-    def disabled(cls):
-        """
-        Returns a new disabled config default with enabled set to false.
-        When called on a subclass, returns an instance of that subclass.
-        """
-        return cls(enabled=False)
-
     def _base_to_dict(self) -> Dict[str, Any]:
         """
         Render the base config fields as a dictionary object.

packages/sdk/server-ai/tests/test_model_config.py

@@ -4,7 +4,7 @@
 
 from ldai import LDAIClient, LDMessage, ModelConfig
 from ldai.models import (AIAgentConfigDefault, AICompletionConfigDefault,
-                         AIConfigDefault, AIJudgeConfigDefault)
+                         AIJudgeConfigDefault)
 
 
 @pytest.fixture
@@ -354,46 +354,6 @@ def test_sdk_info_tracked_on_init():
     )
 
 
-# ============================================================================
-# disabled() classmethod tests
-# ============================================================================
-
-def test_ai_config_default_disabled_returns_disabled_instance():
-    result = AIConfigDefault.disabled()
-    assert isinstance(result, AIConfigDefault)
-    assert result.enabled is False
-
-
-def test_completion_config_default_disabled_returns_correct_type():
-    result = AICompletionConfigDefault.disabled()
-    assert isinstance(result, AICompletionConfigDefault)
-    assert result.enabled is False
-    assert result.messages is None
-    assert result.model is None
-
-
-def test_agent_config_default_disabled_returns_correct_type():
-    result = AIAgentConfigDefault.disabled()
-    assert isinstance(result, AIAgentConfigDefault)
-    assert result.enabled is False
-    assert result.instructions is None
-    assert result.model is None
-
-
-def test_judge_config_default_disabled_returns_correct_type():
-    result = AIJudgeConfigDefault.disabled()
-    assert isinstance(result, AIJudgeConfigDefault)
-    assert result.enabled is False
-    assert result.messages is None
-    assert result.evaluation_metric_key is None
-
-
-def test_disabled_returns_new_instance_each_call():
-    first = AICompletionConfigDefault.disabled()
-    second = AICompletionConfigDefault.disabled()
-    assert first is not second
-
-
 # ============================================================================
 # Optional default value tests
 # ============================================================================