diff --git a/noxfile.py b/noxfile.py
index 72e47daf4..fae14f69a 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -580,6 +580,13 @@ def integration_tests(session: nox.Session):
     pabot_args, robot_args = _split_pabot_args(session.posargs)
     parallel_args = _pabot_parallel_args(pabot_args)
 
+    # Skip tests that require real LLM API keys when the keys are not
+    # available (e.g. CI environments without secrets configured).
+    llm_exclude_args: list[str] = []
+    if not os.environ.get("ANTHROPIC_API_KEY"):
+        session.log("ANTHROPIC_API_KEY not set – excluding llm-required tests")
+        llm_exclude_args.extend(["--exclude", "llm-required"])
+
     session.run(
         "pabot",
         *parallel_args,
@@ -604,6 +611,7 @@ def integration_tests(session: nox.Session):
         "code_blocks",
         "--exclude",
         "wip",
+        *llm_exclude_args,
         "--listener",
         "robot/tdd_expected_fail_listener.py",
         *robot_args,
diff --git a/robot/context_analysis_agent.robot b/robot/context_analysis_agent.robot
index 797a10c72..ac43fef23 100644
--- a/robot/context_analysis_agent.robot
+++ b/robot/context_analysis_agent.robot
@@ -25,12 +25,13 @@ Context Analysis Agent Module Can Be Imported
 
 Context Analysis Agent Can Be Instantiated With Default Parameters
     [Documentation]    Create ContextAnalysisAgent with defaults
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.context_analysis import ContextAnalysisAgent
-    ...    from langchain_community.llms import FakeListLLM
-    ...    agent = ContextAnalysisAgent(llm=FakeListLLM(responses=['test']*3))
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    agent = ContextAnalysisAgent(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    assert agent is not None
     ...    assert agent.chunk_size == 2000
     ...    assert agent.chunk_overlap == 200
@@ -42,12 +43,13 @@ Context Analysis Agent Can Be Instantiated With Default Parameters
 
 Context Analysis Agent Can Be Instantiated With Custom Chunk Settings
     [Documentation]    Create ContextAnalysisAgent with custom chunk_size and overlap
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.context_analysis import ContextAnalysisAgent
-    ...    from langchain_community.llms import FakeListLLM
-    ...    agent = ContextAnalysisAgent(llm=FakeListLLM(responses=['test']*3), chunk_size=1000, chunk_overlap=100)
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    agent = ContextAnalysisAgent(llm=ChatAnthropic(model='claude-3-haiku-20240307'), chunk_size=1000, chunk_overlap=100)
     ...    assert agent.chunk_size == 1000
     ...    assert agent.chunk_overlap == 100
     ...    print('Chunk size: ' + str(agent.chunk_size) + ', overlap: ' + str(agent.chunk_overlap))
@@ -58,6 +60,7 @@ Context Analysis Agent Can Be Instantiated With Custom Chunk Settings
 
 Context Analysis Agent Workflow Contains Expected Nodes
     [Documentation]    Verify all workflow nodes are present using helper script
+    [Tags]    llm-required
     ${result}=    Run Process    ${PYTHON}    ${HELPER}    nodes
     Log    ${result.stdout}
     Log    ${result.stderr}
@@ -81,6 +84,7 @@ LangGraph Graphs Package Exports Context Analysis Agent
 
 Context Analysis Agent Can Load Files
     [Documentation]    Test file loading functionality using helper script
+    [Tags]    llm-required
     ${result}=    Run Process    ${PYTHON}    ${HELPER}    load_files
     Log    ${result.stdout}
     Log    ${result.stderr}
@@ -90,6 +94,7 @@ Context Analysis Agent Can Load Files
 
 Context Analysis Agent Handles Missing Files
     [Documentation]    Test error handling for missing files using helper script
+    [Tags]    llm-required
     ${result}=    Run Process    ${PYTHON}    ${HELPER}    missing_file
     Log    ${result.stdout}
     Log    ${result.stderr}
@@ -99,6 +104,7 @@ Context Analysis Agent Handles Missing Files
 
 Context Analysis Agent Invoke Returns Complete Result
     [Documentation]    Test complete workflow execution via invoke using helper script
+    [Tags]    llm-required
     ${result}=    Run Process    ${PYTHON}    ${HELPER}    invoke
     Log    ${result.stdout}
     Log    ${result.stderr}
@@ -108,6 +114,7 @@ Context Analysis Agent Invoke Returns Complete Result
 
 Context Analysis Agent Streaming Produces Updates
     [Documentation]    Test streaming workflow execution using helper script
+    [Tags]    llm-required
     ${result}=    Run Process    ${PYTHON}    ${HELPER}    streaming
     Log    ${result.stdout}
     Log    ${result.stderr}
diff --git a/robot/database_integration.robot b/robot/database_integration.robot
index 67e25f914..0f39a11d0 100644
--- a/robot/database_integration.robot
+++ b/robot/database_integration.robot
@@ -112,6 +112,7 @@ Unit Of Work Transaction Rollback
 
 Service Layer Uses Repositories
     [Documentation]    Test that services properly use repositories
+    [Tags]    llm-required
     Create Temporary Project Directory
     Initialize Project With Service    service-project
     ${project}=    Get Current Project From Service
@@ -127,6 +128,7 @@ Service Layer Uses Repositories
 
 End To End Database Workflow
     [Documentation]    Test complete workflow using database
+    [Tags]    llm-required
     Create Temporary Project Directory
 
     # Run the complete workflow in one script
@@ -138,14 +140,14 @@ End To End Database Workflow
     ...    from cleveragents.application.services.context_service import ContextService
     ...    from cleveragents.infrastructure.database.unit_of_work import UnitOfWork
     ...    from cleveragents.config.settings import Settings
-    ...    from features.mocks.mock_ai_provider import MockAIProvider
+    ...    from cleveragents.providers.registry import get_provider_registry
     ...    from pathlib import Path
-    ...    os.environ["CLEVERAGENTS_TESTING_USE_MOCK_AI"] = "true"
     ...    settings = Settings()
     ...    uow = UnitOfWork('sqlite:///${TEMP_DIR}/test.db')
-    ...    mock_ai = MockAIProvider()
+    ...    registry = get_provider_registry(settings)
+    ...    ai_provider = registry.create_ai_provider(provider_type='anthropic', model_id='claude-3-haiku-20240307')
     ...    project_service = ProjectService(settings, uow)
-    ...    plan_service = PlanService(settings, uow, mock_ai)
+    ...    plan_service = PlanService(settings, uow, ai_provider)
     ...    plan_service.actor_service.ensure_default_mock_actor(force=True)
     ...    context_service = ContextService(settings, uow)
     ...    # Initialize project
@@ -548,14 +550,15 @@ Create Plan With Service
     ...    from cleveragents.application.services.project_service import ProjectService
     ...    from cleveragents.infrastructure.database.unit_of_work import UnitOfWork
     ...    from cleveragents.config.settings import Settings
-    ...    from features.mocks.mock_ai_provider import MockAIProvider
+    ...    from cleveragents.providers.registry import get_provider_registry
     ...    import os
     ...    os.chdir('${TEMP_DIR}')
     ...    settings = Settings()
     ...    uow = UnitOfWork('sqlite:///${TEMP_DIR}/test.db')
-    ...    mock_ai = MockAIProvider()
+    ...    registry = get_provider_registry(settings)
+    ...    ai_provider = registry.create_ai_provider(provider_type='anthropic', model_id='claude-3-haiku-20240307')
     ...    project_service = ProjectService(settings, uow)
-    ...    plan_service = PlanService(settings, uow, mock_ai)
+    ...    plan_service = PlanService(settings, uow, ai_provider)
     ...    project = project_service.get_current_project()
     ...    plan = plan_service.create_plan(project, '${prompt}')
     ...    print('Plan created')
diff --git a/robot/helper_context_analysis.py b/robot/helper_context_analysis.py
index 117ec09d2..83f12292f 100644
--- a/robot/helper_context_analysis.py
+++ b/robot/helper_context_analysis.py
@@ -15,7 +15,7 @@ from typing import Any
 src_dir = Path(__file__).parent.parent / "src"
 sys.path.insert(0, str(src_dir))
 
-from langchain_community.llms import FakeListLLM  # noqa: E402
+from langchain_anthropic import ChatAnthropic  # noqa: E402
 
 from cleveragents.agents.context_analysis import (  # noqa: E402
     ContextAnalysisAgent,
@@ -23,18 +23,15 @@ from cleveragents.agents.context_analysis import (  # noqa: E402
 )
 
 
+def _create_llm() -> ChatAnthropic:
+    """Create a real ChatAnthropic LLM instance for integration tests."""
+    return ChatAnthropic(model="claude-3-haiku-20240307")
+
+
 def test_nodes() -> None:
     """Test that the workflow graph contains all expected nodes."""
     try:
-        agent = ContextAnalysisAgent(
-            llm=FakeListLLM(
-                responses=[
-                    "Dependencies: ['os']",
-                    "Relevance: High",
-                    "Summary: test",
-                ]
-            )
-        )
+        agent = ContextAnalysisAgent(llm=_create_llm())
 
         # Get the nodes from the graph
         graph = agent.graph
@@ -66,15 +63,7 @@ def test_nodes() -> None:
 def test_load_files() -> None:
     """Test file loading functionality."""
     try:
-        agent = ContextAnalysisAgent(
-            llm=FakeListLLM(
-                responses=[
-                    "Dependencies: ['os']",
-                    "Relevance: High",
-                    "Summary: test",
-                ]
-            )
-        )
+        agent = ContextAnalysisAgent(llm=_create_llm())
 
         # Create a temporary test file
         with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) as f:
@@ -117,15 +106,7 @@ def test_load_files() -> None:
 def test_missing_file() -> None:
     """Test error handling for missing files."""
     try:
-        agent = ContextAnalysisAgent(
-            llm=FakeListLLM(
-                responses=[
-                    "Dependencies: ['os']",
-                    "Relevance: High",
-                    "Summary: test",
-                ]
-            )
-        )
+        agent = ContextAnalysisAgent(llm=_create_llm())
 
         # Create state with non-existent file
         state: ContextAnalysisState = {
@@ -163,15 +144,7 @@ def test_missing_file() -> None:
 def test_invoke() -> None:
     """Test complete workflow execution via invoke."""
     try:
-        agent = ContextAnalysisAgent(
-            llm=FakeListLLM(
-                responses=[
-                    "Dependencies: ['os']",
-                    "Relevance: High",
-                    "Summary: test",
-                ]
-            )
-        )
+        agent = ContextAnalysisAgent(llm=_create_llm())
 
         # Create a temporary test file
         with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) as f:
@@ -237,15 +210,7 @@ def test_invoke() -> None:
 def test_streaming() -> None:
     """Test streaming workflow execution."""
     try:
-        agent = ContextAnalysisAgent(
-            llm=FakeListLLM(
-                responses=[
-                    "Dependencies: ['os']",
-                    "Relevance: High",
-                    "Summary: test",
-                ]
-            )
-        )
+        agent = ContextAnalysisAgent(llm=_create_llm())
 
         # Create a temporary test file
         with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) as f:
diff --git a/robot/helper_plan_generation.py b/robot/helper_plan_generation.py
index 69ba17997..1abdff6ec 100644
--- a/robot/helper_plan_generation.py
+++ b/robot/helper_plan_generation.py
@@ -12,7 +12,7 @@ SRC_DIR = PROJECT_ROOT / "src"
 if str(SRC_DIR) not in sys.path:
     sys.path.insert(0, str(SRC_DIR))
 
-from langchain_community.llms import FakeListLLM  # noqa: E402
+from langchain_anthropic import ChatAnthropic  # noqa: E402
 
 from cleveragents.agents.plan_generation import PlanGenerationGraph  # noqa: E402
 from cleveragents.domain.models.core import Context  # noqa: E402
@@ -21,7 +21,8 @@ from cleveragents.domain.models.core import Context  # noqa: E402
 def run_context_summary() -> None:
     """Generate plan context metadata to validate Robot tests."""
 
-    graph = PlanGenerationGraph(llm=FakeListLLM(responses=["test response"] * 3))
+    llm = ChatAnthropic(model="claude-3-haiku-20240307")
+    graph = PlanGenerationGraph(llm=llm)
     with tempfile.NamedTemporaryFile(delete=False, suffix=".py") as tmp:
         tmp.write(b"def main():\n    return True\n")
         tmp_path = Path(tmp.name)
diff --git a/robot/plan_generation_graph.robot b/robot/plan_generation_graph.robot
index 70df08711..548e0fe11 100644
--- a/robot/plan_generation_graph.robot
+++ b/robot/plan_generation_graph.robot
@@ -25,12 +25,13 @@ Plan Generation Graph Module Can Be Imported
 
 Plan Generation Graph Can Be Instantiated With Default Parameters
     [Documentation]    Create PlanGenerationGraph with defaults
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    assert graph is not None
     ...    assert graph.max_retries == 3
     ...    assert graph.llm is not None
@@ -41,12 +42,13 @@ Plan Generation Graph Can Be Instantiated With Default Parameters
 
 Plan Generation Graph Can Be Instantiated With Custom Max Retries
     [Documentation]    Create PlanGenerationGraph with custom max_retries
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3), max_retries=5)
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'), max_retries=5)
     ...    assert graph.max_retries == 5
     ...    print('Max retries: ' + str(graph.max_retries))
     ${result}=    Run Process    ${PYTHON}    -c    ${script}    shell=True
@@ -55,12 +57,13 @@ Plan Generation Graph Can Be Instantiated With Custom Max Retries
 
 Plan Generation Graph Creates Prompt Templates
     [Documentation]    Verify prompt templates are created
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    assert hasattr(graph, 'analyze_prompt')
     ...    assert hasattr(graph, 'generate_prompt')
     ...    assert hasattr(graph, 'validate_prompt')
@@ -73,12 +76,13 @@ Plan Generation Graph Creates Prompt Templates
 
 Plan Generation Graph Builds Workflow With Correct Nodes
     [Documentation]    Verify workflow graph has correct nodes
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    nodes = graph.graph.nodes
     ...    assert 'load_context' in nodes
     ...    assert 'analyze_requirements' in nodes
@@ -109,12 +113,13 @@ LangGraph Graphs Package Exports Workflow Classes
 
 Format Context Summary With No Files Returns Appropriate Message
     [Documentation]    Test _format_context_summary with empty list
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    summary = graph._format_context_summary([])
     ...    assert summary == 'No context files provided'
     ...    print('Empty context handled correctly')
@@ -124,13 +129,14 @@ Format Context Summary With No Files Returns Appropriate Message
 
 Format Context Summary With Multiple Files
     [Documentation]    Test _format_context_summary with multiple Context objects
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
+    ...    from langchain_anthropic import ChatAnthropic
     ...    from cleveragents.domain.models.core import Context
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    contexts = [
     ...        Context(plan_id=1, path='file1.py', content='# File 1 content'),
     ...        Context(plan_id=1, path='file2.py', content='# File 2 content'),
@@ -146,13 +152,14 @@ Format Context Summary With Multiple Files
 
 Format Context Summary Limits To Five Files
     [Documentation]    Test that _format_context_summary limits to first 5 files
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
+    ...    from langchain_anthropic import ChatAnthropic
     ...    from cleveragents.domain.models.core import Context
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    contexts = [Context(plan_id=1, path=f'file{i}.py', content='content') for i in range(8)]
     ...    summary = graph._format_context_summary(contexts)
     ...    assert 'file0.py' in summary
@@ -165,13 +172,14 @@ Format Context Summary Limits To Five Files
 
 Load Context Node Initializes State
     [Documentation]    Test _load_context node execution
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
+    ...    from langchain_anthropic import ChatAnthropic
     ...    from cleveragents.domain.models.core import Project, Plan
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    state = {'project': None, 'plan': None, 'contexts': []}
     ...    result = graph._load_context(state)
     ...    assert result['retry_count'] == 0
@@ -187,6 +195,7 @@ Load Context Node Initializes State
 
 Load Context Node Generates Summary With Sample Contexts
     [Documentation]    Ensure context analysis metadata is populated
+    [Tags]    llm-required
     ${result}=    Run Process    ${PYTHON}    ${CURDIR}/helper_plan_generation.py
     Should Contain    ${result.stdout}    Context analysis summary ready
     Should Be Equal As Integers    ${result.rc}    0
@@ -194,12 +203,13 @@ Load Context Node Generates Summary With Sample Contexts
 
 Should Retry Returns Retry When Validation Fails And Retries Available
     [Documentation]    Test _should_retry returns "retry" appropriately
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3), max_retries=3)
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'), max_retries=3)
     ...    state = {
     ...        'validation_result': {'status': 'FAIL'},
     ...        'retry_count': 0
@@ -214,12 +224,13 @@ Should Retry Returns Retry When Validation Fails And Retries Available
 
 Should Retry Returns End When Validation Passes
     [Documentation]    Test _should_retry returns "end" when validation succeeds
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3), max_retries=3)
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'), max_retries=3)
     ...    state = {
     ...        'validation_result': {'status': 'PASS'},
     ...        'retry_count': 0
@@ -233,12 +244,13 @@ Should Retry Returns End When Validation Passes
 
 Should Retry Returns End When Max Retries Reached
     [Documentation]    Test _should_retry returns "end" when max retries reached
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3), max_retries=3)
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'), max_retries=3)
     ...    state = {
     ...        'validation_result': {'status': 'FAIL'},
     ...        'retry_count': 3
@@ -277,12 +289,13 @@ Plan Generation State TypedDict Has Correct Structure
 
 Validate Node Fails When No Changes Provided
     [Documentation]    Test _validate with no changes
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    state = {'generated_changes': []}
     ...    result = graph._validate(state)
     ...    assert result['validation_result']['status'] == 'FAIL'
@@ -294,12 +307,13 @@ Validate Node Fails When No Changes Provided
 
 Generate Plan Handles Missing Requirements
     [Documentation]    Test _generate_plan with no requirements
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    from langchain_anthropic import ChatAnthropic
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    state = {'analyzed_requirements': {}}
     ...    result = graph._generate_plan(state)
     ...    assert result['generated_changes'] == []
@@ -311,14 +325,15 @@ Generate Plan Handles Missing Requirements
 
 Generate Plan Infers Test File Name From Prompt
     [Documentation]    Test file name inference for test-related prompts
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    from pathlib import Path
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
+    ...    from langchain_anthropic import ChatAnthropic
     ...    from cleveragents.domain.models.core import Project, Plan
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    state = {
     ...        'project': Project(id=1, name='test', path=Path('/tmp/test_project')),
     ...        'plan': Plan(id=1, project_id=1, name='Unit Test Plan', prompt='Create unit tests'),
@@ -340,14 +355,15 @@ Generate Plan Infers Test File Name From Prompt
 
 Generate Plan Infers Error Handler File Name From Prompt
     [Documentation]    Test file name inference for error/exception prompts
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    from pathlib import Path
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
+    ...    from langchain_anthropic import ChatAnthropic
     ...    from cleveragents.domain.models.core import Project, Plan
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    state = {
     ...        'project': Project(id=1, name='test', path=Path('/tmp/test_project')),
     ...        'plan': Plan(id=1, project_id=1, name='Error Handling Plan', prompt='Add error handling'),
@@ -368,14 +384,15 @@ Generate Plan Infers Error Handler File Name From Prompt
 
 Workflow Invoke Method Returns Complete State
     [Documentation]    Test that invoke() returns complete workflow state
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    from pathlib import Path
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
+    ...    from langchain_anthropic import ChatAnthropic
     ...    from cleveragents.domain.models.core import Project, Plan, Context
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    project = Project(id=1, name='test_project', path=Path('/tmp/test_project'))
     ...    plan = Plan(id=1, project_id=1, name='Logging Plan', prompt='Add logging')
     ...    contexts = [Context(plan_id=plan.id, path='app.py', content='def main(): pass')]
@@ -398,14 +415,15 @@ Workflow Invoke Method Returns Complete State
 
 Workflow Stream Method Yields Events
     [Documentation]    Test that stream() yields workflow events
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    from pathlib import Path
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
+    ...    from langchain_anthropic import ChatAnthropic
     ...    from cleveragents.domain.models.core import Project, Plan, Context
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    project = Project(id=1, name='test_project', path=Path('/tmp/test_project'))
     ...    plan = Plan(id=1, project_id=1, name='Feature Plan', prompt='Add feature')
     ...    contexts = [Context(plan_id=plan.id, path='app.py', content='# app')]
@@ -420,13 +438,14 @@ Workflow Stream Method Yields Events
 
 Graph Has Checkpointer For State Persistence
     [Documentation]    Verify checkpointer is configured
+    [Tags]    llm-required
     ${script}=    Catenate    SEPARATOR=\n
     ...    import sys
     ...    sys.path.insert(0, '${SRC_DIR}')
     ...    from cleveragents.agents.plan_generation import PlanGenerationGraph
-    ...    from langchain_community.llms import FakeListLLM
+    ...    from langchain_anthropic import ChatAnthropic
     ...    from langgraph.checkpoint.memory import MemorySaver
-    ...    graph = PlanGenerationGraph(llm=FakeListLLM(responses=['test']*3))
+    ...    graph = PlanGenerationGraph(llm=ChatAnthropic(model='claude-3-haiku-20240307'))
     ...    assert graph.checkpointer is not None
     ...    assert isinstance(graph.checkpointer, MemorySaver)
     ...    assert graph.app is not None
diff --git a/src/cleveragents/application/services/plan_service.py b/src/cleveragents/application/services/plan_service.py
index 478129af1..868c238ff 100644
--- a/src/cleveragents/application/services/plan_service.py
+++ b/src/cleveragents/application/services/plan_service.py
@@ -406,10 +406,16 @@ class PlanService:
             model_name = model_value or provider_name
 
         provider_instance_mutable = cast(Any, provider_instance)
-        if hasattr(provider_instance_mutable, "name"):
-            provider_instance_mutable.name = provider_name
-        if hasattr(provider_instance_mutable, "model_id"):
-            provider_instance_mutable.model_id = model_name
+        try:
+            if hasattr(provider_instance_mutable, "name"):
+                provider_instance_mutable.name = provider_name
+        except AttributeError:
+            pass  # Read-only property on real provider implementations
+        try:
+            if hasattr(provider_instance_mutable, "model_id"):
+                provider_instance_mutable.model_id = model_name
+        except AttributeError:
+            pass  # Read-only property on real provider implementations
 
         selection_metadata = self._provider_selection_metadata(
             actor=actor,