diff --git a/README.md b/README.md
index 6c285fb6..eb0a429b 100644
--- a/README.md
+++ b/README.md
@@ -88,8 +88,8 @@ To customize settings, create a `haiku.rag.yaml` config file (see [Configuration
 
 ```python
 from haiku.rag.client import HaikuRAG
+from haiku.rag.config import Config
 from haiku.rag.research import (
-    PlanNode,
     ResearchContext,
     ResearchDeps,
     ResearchState,
@@ -115,34 +115,22 @@ async with HaikuRAG("database.lancedb") as client:
     print(answer)
 
     # Multi‑agent research pipeline (Plan → Search → Evaluate → Synthesize)
-    graph = build_research_graph()
+    # Graph settings (provider, model, max_iterations, etc.) come from config
+    graph = build_research_graph(config=Config)
     question = (
         "What are the main drivers and trends of global temperature "
         "anomalies since 1990?"
     )
-    state = ResearchState(
-        context=ResearchContext(original_question=question),
-        max_iterations=2,
-        confidence_threshold=0.8,
-        max_concurrency=2,
-    )
+    context = ResearchContext(original_question=question)
+    state = ResearchState.from_config(context=context, config=Config)
     deps = ResearchDeps(client=client)
 
     # Blocking run (final result only)
-    result = await graph.run(
-        PlanNode(provider="openai", model="gpt-4o-mini"),
-        state=state,
-        deps=deps,
-    )
-    print(result.output.title)
+    report = await graph.run(state=state, deps=deps)
+    print(report.title)
 
     # Streaming progress (log/report/error events)
-    async for event in stream_research_graph(
-        graph,
-        PlanNode(provider="openai", model="gpt-4o-mini"),
-        state,
-        deps,
-    ):
+    async for event in stream_research_graph(graph, state, deps):
         if event.type == "log":
             iteration = event.state.iterations if event.state else state.iterations
             print(f"[{iteration}] {event.message}")
diff --git a/docs/agents.md b/docs/agents.md
index b9dc8065..e9fb688a 100644
--- a/docs/agents.md
+++ b/docs/agents.md
@@ -78,7 +78,7 @@ Key differences from Research:
 
 Note on parallel execution:
 - The `search_one` node is mapped over all questions in a batch
-- Parallelism is controlled via `max_concurrency` using asyncio.Semaphore
+- Parallelism is controlled via `max_concurrency`
 - All questions in an iteration are processed before evaluation
 
 CLI usage:
@@ -95,25 +95,19 @@ Python usage:
 
 ```python
 from haiku.rag.client import HaikuRAG
+from haiku.rag.config import Config
 from haiku.rag.qa.deep.dependencies import DeepQAContext
 from haiku.rag.qa.deep.graph import build_deep_qa_graph
 from haiku.rag.qa.deep.state import DeepQADeps, DeepQAState
 
 async with HaikuRAG(path_to_db) as client:
-    graph = build_deep_qa_graph(
-        provider="openai",
-        model="gpt-4o-mini"
-    )
+    # Use global config (recommended)
+    graph = build_deep_qa_graph(config=Config)
     context = DeepQAContext(
         original_question="What are the main features of haiku.rag?",
         use_citations=True
     )
-    state = DeepQAState(
-        context=context,
-        max_sub_questions=3,
-        max_iterations=2,
-        max_concurrency=1
-    )
+    state = DeepQAState.from_config(context=context, config=Config)
     deps = DeepQADeps(client=client)
 
     result = await graph.run(
@@ -125,6 +119,33 @@ async with HaikuRAG(path_to_db) as client:
     print(result.sources)
 ```
 
+Alternative usage with custom config:
+
+```python
+# Create a custom config with different settings
+from haiku.rag.config.models import AppConfig, QAConfig
+
+custom_config = AppConfig(
+    qa=QAConfig(
+        provider="openai",
+        model="gpt-4o-mini",
+        max_sub_questions=5,
+        max_iterations=3,
+        max_concurrency=2,
+    )
+)
+
+graph = build_deep_qa_graph(config=custom_config)
+context = DeepQAContext(
+    original_question="What are the main features of haiku.rag?",
+    use_citations=True
+)
+state = DeepQAState.from_config(context=context, config=custom_config)
+deps = DeepQADeps(client=client)
+
+result = await graph.run(state=state, deps=deps)
+```
+
 ### Research Graph
 
 The research workflow is implemented as a typed pydantic‑graph. It plans, searches (in parallel batches), evaluates, and synthesizes into a final report — with clear stop conditions and shared state.
@@ -166,39 +187,34 @@ Primary models:
 
 Note on parallel execution:
 - The `search_one` node is mapped over all questions in a batch
-- Parallelism is controlled via `max_concurrency` using asyncio.Semaphore
+- Parallelism is controlled via `max_concurrency`
 - Analysis and decision nodes process results after each batch completes
 
 CLI usage:
 
 ```bash
-haiku-rag research "How does haiku.rag organize and query documents?" \
-  --max-iterations 2 \
-  --confidence-threshold 0.8 \
-  --max-concurrency 3 \
-  --verbose
+# Basic usage (uses config from file or defaults)
+haiku-rag research "How does haiku.rag organize and query documents?" --verbose
+
+# With custom config file
+haiku-rag --config my-research-config.yaml research "How does haiku.rag organize and query documents?" --verbose
 ```
 
 Python usage (blocking result):
 
 ```python
 from haiku.rag.client import HaikuRAG
+from haiku.rag.config import Config
 from haiku.rag.research.dependencies import ResearchContext
 from haiku.rag.research.graph import build_research_graph
 from haiku.rag.research.state import ResearchDeps, ResearchState
 
 async with HaikuRAG(path_to_db) as client:
-    graph = build_research_graph(
-        provider="openai",
-        model="gpt-4o-mini"
-    )
+    # Use global config (recommended)
+    graph = build_research_graph(config=Config)
     question = "What are the main drivers and trends of global temperature anomalies since 1990?"
-    state = ResearchState(
-        context=ResearchContext(original_question=question),
-        max_iterations=2,
-        confidence_threshold=0.8,
-        max_concurrency=2,
-    )
+    context = ResearchContext(original_question=question)
+    state = ResearchState.from_config(context=context, config=Config)
     deps = ResearchDeps(client=client)
 
     result = await graph.run(
@@ -211,27 +227,44 @@ async with HaikuRAG(path_to_db) as client:
     print(report.executive_summary)
 ```
 
+Alternative usage with custom config:
+
+```python
+from haiku.rag.config.models import AppConfig, ResearchConfig
+
+custom_config = AppConfig(
+    research=ResearchConfig(
+        provider="openai",
+        model="gpt-4o-mini",
+        max_iterations=5,
+        confidence_threshold=0.85,
+        max_concurrency=3,
+    )
+)
+
+graph = build_research_graph(config=custom_config)
+context = ResearchContext(original_question=question)
+state = ResearchState.from_config(context=context, config=custom_config)
+deps = ResearchDeps(client=client)
+
+result = await graph.run(state=state, deps=deps)
+```
+
 Python usage (streamed events):
 
 ```python
 from haiku.rag.client import HaikuRAG
+from haiku.rag.config import Config
 from haiku.rag.research.dependencies import ResearchContext
 from haiku.rag.research.graph import build_research_graph
 from haiku.rag.research.state import ResearchDeps, ResearchState
 from haiku.rag.research.stream import stream_research_graph
 
 async with HaikuRAG(path_to_db) as client:
-    graph = build_research_graph(
-        provider="openai",
-        model="gpt-4o-mini"
-    )
+    graph = build_research_graph(config=Config)
     question = "What are the main drivers and trends of global temperature anomalies since 1990?"
-    state = ResearchState(
-        context=ResearchContext(original_question=question),
-        max_iterations=2,
-        confidence_threshold=0.8,
-        max_concurrency=2,
-    )
+    context = ResearchContext(original_question=question)
+    state = ResearchState.from_config(context=context, config=Config)
     deps = ResearchDeps(client=client)
 
     async for event in stream_research_graph(
diff --git a/haiku_rag_slim/haiku/rag/app.py b/haiku_rag_slim/haiku/rag/app.py
index 7eea7e6c..6aa2c178 100644
--- a/haiku_rag_slim/haiku/rag/app.py
+++ b/haiku_rag_slim/haiku/rag/app.py
@@ -204,23 +204,29 @@ class HaikuRAGApp:
         deep: bool = False,
         verbose: bool = False,
     ):
+        """Ask a question using the RAG system.
+
+        Args:
+            question: The question to ask
+            cite: Include citations in the answer
+            deep: Use deep QA mode (multi-step reasoning)
+            verbose: Show verbose output
+        """
         async with HaikuRAG(db_path=self.db_path) as self.client:
             try:
                 if deep:
                     from rich.console import Console
 
+                    from haiku.rag.config import Config
                     from haiku.rag.qa.deep.dependencies import DeepQAContext
                     from haiku.rag.qa.deep.graph import build_deep_qa_graph
                     from haiku.rag.qa.deep.state import DeepQADeps, DeepQAState
 
-                    graph = build_deep_qa_graph(
-                        provider=Config.qa.provider,
-                        model=Config.qa.model,
-                    )
+                    graph = build_deep_qa_graph(config=Config)
                     context = DeepQAContext(
                         original_question=question, use_citations=cite
                     )
-                    state = DeepQAState(context=context)
+                    state = DeepQAState.from_config(context=context, config=Config)
                     deps = DeepQADeps(
                         client=self.client, console=Console() if verbose else None
                     )
@@ -240,28 +246,26 @@ class HaikuRAGApp:
     async def research(
         self,
         question: str,
-        max_iterations: int = 3,
-        confidence_threshold: float = 0.8,
         verbose: bool = False,
     ):
-        """Run research via the pydantic-graph pipeline (default)."""
+        """Run research via the pydantic-graph pipeline.
+
+        Args:
+            question: The research question
+            verbose: Show verbose output
+        """
         async with HaikuRAG(db_path=self.db_path) as client:
             try:
+                from haiku.rag.config import Config
+
                 if verbose:
                     self.console.print("[bold cyan]Starting research[/bold cyan]")
                     self.console.print(f"[bold blue]Question:[/bold blue] {question}")
                     self.console.print()
 
-                graph = build_research_graph(
-                    provider=Config.research.provider or Config.qa.provider,
-                    model=Config.research.model or Config.qa.model,
-                )
+                graph = build_research_graph(config=Config)
                 context = ResearchContext(original_question=question)
-                state = ResearchState(
-                    context=context,
-                    max_iterations=max_iterations,
-                    confidence_threshold=confidence_threshold,
-                )
+                state = ResearchState.from_config(context=context, config=Config)
                 deps = ResearchDeps(
                     client=client, console=self.console if verbose else None
                 )
diff --git a/haiku_rag_slim/haiku/rag/cli.py b/haiku_rag_slim/haiku/rag/cli.py
index 11e059c7..edefec59 100644
--- a/haiku_rag_slim/haiku/rag/cli.py
+++ b/haiku_rag_slim/haiku/rag/cli.py
@@ -290,17 +290,6 @@ def research(
     question: str = typer.Argument(
         help="The research question to investigate",
     ),
-    max_iterations: int = typer.Option(
-        3,
-        "--max-iterations",
-        "-n",
-        help="Maximum search/analyze iterations",
-    ),
-    confidence_threshold: float = typer.Option(
-        0.8,
-        "--confidence-threshold",
-        help="Minimum confidence (0-1) to stop",
-    ),
     db: Path = typer.Option(
         Config.storage.data_dir / "haiku.rag.lancedb",
         "--db",
@@ -315,14 +304,7 @@ def research(
     from haiku.rag.app import HaikuRAGApp
 
     app = HaikuRAGApp(db_path=db)
-    asyncio.run(
-        app.research(
-            question=question,
-            max_iterations=max_iterations,
-            confidence_threshold=confidence_threshold,
-            verbose=verbose,
-        )
-    )
+    asyncio.run(app.research(question=question, verbose=verbose))
 
 
 @cli.command("settings", help="Display current configuration settings")
diff --git a/haiku_rag_slim/haiku/rag/config/models.py b/haiku_rag_slim/haiku/rag/config/models.py
index 4c654e7a..801c6dcb 100644
--- a/haiku_rag_slim/haiku/rag/config/models.py
+++ b/haiku_rag_slim/haiku/rag/config/models.py
@@ -37,11 +37,17 @@ class RerankingConfig(BaseModel):
 class QAConfig(BaseModel):
     provider: str = "ollama"
     model: str = "gpt-oss"
+    max_sub_questions: int = 3
+    max_iterations: int = 2
+    max_concurrency: int = 1
 
 
 class ResearchConfig(BaseModel):
     provider: str = "ollama"
     model: str = "gpt-oss"
+    max_iterations: int = 3
+    confidence_threshold: float = 0.8
+    max_concurrency: int = 1
 
 
 class ProcessingConfig(BaseModel):
diff --git a/haiku_rag_slim/haiku/rag/mcp.py b/haiku_rag_slim/haiku/rag/mcp.py
index 8a4573fa..3c18587c 100644
--- a/haiku_rag_slim/haiku/rag/mcp.py
+++ b/haiku_rag_slim/haiku/rag/mcp.py
@@ -2,11 +2,11 @@ from pathlib import Path
 from typing import Any
 
 from fastmcp import FastMCP
-from haiku.rag.client import HaikuRAG
-from haiku.rag.research.models import ResearchReport
 from pydantic import BaseModel
 
+from haiku.rag.client import HaikuRAG
 from haiku.rag.config import Config
+from haiku.rag.research.models import ResearchReport
 
 
 class SearchResult(BaseModel):
@@ -191,20 +191,16 @@ def create_mcp_server(db_path: Path) -> FastMCP:
         try:
             async with HaikuRAG(db_path) as rag:
                 if deep:
+                    from haiku.rag.config import Config
                     from haiku.rag.qa.deep.dependencies import DeepQAContext
                     from haiku.rag.qa.deep.graph import build_deep_qa_graph
                     from haiku.rag.qa.deep.state import DeepQADeps, DeepQAState
 
-                    from haiku.rag.config import Config
-
-                    graph = build_deep_qa_graph(
-                        provider=Config.qa.provider,
-                        model=Config.qa.model,
-                    )
+                    graph = build_deep_qa_graph(config=Config)
                     context = DeepQAContext(
                         original_question=question, use_citations=cite
                     )
-                    state = DeepQAState(context=context)
+                    state = DeepQAState.from_config(context=context, config=Config)
                     deps = DeepQADeps(client=rag)
 
                     result = await graph.run(state=state, deps=deps)
@@ -218,9 +214,6 @@ def create_mcp_server(db_path: Path) -> FastMCP:
     @mcp.tool()
     async def research_question(
         question: str,
-        max_iterations: int = 3,
-        confidence_threshold: float = 0.8,
-        max_concurrency: int = 1,
     ) -> ResearchReport | None:
         """Run multi-agent research to investigate a complex question.
 
@@ -229,9 +222,6 @@ def create_mcp_server(db_path: Path) -> FastMCP:
 
         Args:
             question: The research question to investigate.
-            max_iterations: Maximum search/analyze iterations (default: 3).
-            confidence_threshold: Minimum confidence score (0-1) to stop early (default: 0.8).
-            max_concurrency: Maximum concurrent sub-questions to process (default: 1).
 
         Returns:
             A research report with findings, or None if an error occurred.
@@ -242,16 +232,9 @@ def create_mcp_server(db_path: Path) -> FastMCP:
             from haiku.rag.research.state import ResearchDeps, ResearchState
 
             async with HaikuRAG(db_path) as rag:
-                graph = build_research_graph(
-                    provider=Config.research.provider or Config.qa.provider,
-                    model=Config.research.model or Config.qa.model,
-                )
-                state = ResearchState(
-                    context=ResearchContext(original_question=question),
-                    max_iterations=max_iterations,
-                    confidence_threshold=confidence_threshold,
-                    max_concurrency=max_concurrency,
-                )
+                graph = build_research_graph(config=Config)
+                context = ResearchContext(original_question=question)
+                state = ResearchState.from_config(context=context, config=Config)
                 deps = ResearchDeps(client=rag)
 
                 result = await graph.run(state=state, deps=deps)
diff --git a/haiku_rag_slim/haiku/rag/qa/deep/graph.py b/haiku_rag_slim/haiku/rag/qa/deep/graph.py
index 4be28cd4..9ded283c 100644
--- a/haiku_rag_slim/haiku/rag/qa/deep/graph.py
+++ b/haiku_rag_slim/haiku/rag/qa/deep/graph.py
@@ -1,5 +1,13 @@
 from typing import Any
 
+from pydantic_ai import Agent, RunContext
+from pydantic_ai.format_prompt import format_as_xml
+from pydantic_ai.output import ToolOutput
+from pydantic_graph.beta import Graph, GraphBuilder, StepContext
+from pydantic_graph.beta.join import reduce_list_append
+
+from haiku.rag.config import Config
+from haiku.rag.config.models import AppConfig
 from haiku.rag.graph_common import get_model, log
 from haiku.rag.graph_common.models import ResearchPlan, SearchAnswer
 from haiku.rag.graph_common.prompts import PLAN_PROMPT, SEARCH_AGENT_PROMPT
@@ -11,16 +19,21 @@ from haiku.rag.qa.deep.prompts import (
     SYNTHESIS_PROMPT_WITH_CITATIONS,
 )
 from haiku.rag.qa.deep.state import DeepQADeps, DeepQAState
-from pydantic_ai import Agent, RunContext
-from pydantic_ai.format_prompt import format_as_xml
-from pydantic_ai.output import ToolOutput
-from pydantic_graph.beta import Graph, GraphBuilder, StepContext
-from pydantic_graph.beta.join import reduce_list_append
 
 
 def build_deep_qa_graph(
-    provider: str, model: str
+    config: AppConfig = Config,
 ) -> Graph[DeepQAState, DeepQADeps, None, DeepQAAnswer]:
+    """Build the Deep QA graph.
+
+    Args:
+        config: AppConfig object (uses config.qa for provider, model, and graph parameters)
+
+    Returns:
+        Configured Deep QA graph
+    """
+    provider = config.qa.provider
+    model = config.qa.model
     g = GraphBuilder(
         state_type=DeepQAState,
         deps_type=DeepQADeps,
diff --git a/haiku_rag_slim/haiku/rag/qa/deep/state.py b/haiku_rag_slim/haiku/rag/qa/deep/state.py
index 46750242..0e07098e 100644
--- a/haiku_rag_slim/haiku/rag/qa/deep/state.py
+++ b/haiku_rag_slim/haiku/rag/qa/deep/state.py
@@ -1,9 +1,14 @@
 import asyncio
 from dataclasses import dataclass
+from typing import TYPE_CHECKING
+
+from rich.console import Console
 
 from haiku.rag.client import HaikuRAG
 from haiku.rag.qa.deep.dependencies import DeepQAContext
-from rich.console import Console
+
+if TYPE_CHECKING:
+    from haiku.rag.config.models import AppConfig
 
 
 @dataclass
@@ -24,3 +29,21 @@ class DeepQAState:
     max_iterations: int = 2
     max_concurrency: int = 1
     iterations: int = 0
+
+    @classmethod
+    def from_config(cls, context: DeepQAContext, config: "AppConfig") -> "DeepQAState":
+        """Create a DeepQAState from an AppConfig.
+
+        Args:
+            context: The DeepQAContext containing the question and settings
+            config: The AppConfig object (uses config.qa for state parameters)
+
+        Returns:
+            A configured DeepQAState instance
+        """
+        return cls(
+            context=context,
+            max_sub_questions=config.qa.max_sub_questions,
+            max_iterations=config.qa.max_iterations,
+            max_concurrency=config.qa.max_concurrency,
+        )
diff --git a/haiku_rag_slim/haiku/rag/research/graph.py b/haiku_rag_slim/haiku/rag/research/graph.py
index 117bf741..a756476e 100644
--- a/haiku_rag_slim/haiku/rag/research/graph.py
+++ b/haiku_rag_slim/haiku/rag/research/graph.py
@@ -1,5 +1,13 @@
 from typing import Any
 
+from pydantic_ai import Agent, RunContext
+from pydantic_ai.format_prompt import format_as_xml
+from pydantic_ai.output import ToolOutput
+from pydantic_graph.beta import Graph, GraphBuilder, StepContext
+from pydantic_graph.beta.join import reduce_list_append
+
+from haiku.rag.config import Config
+from haiku.rag.config.models import AppConfig
 from haiku.rag.graph_common import get_model, log
 from haiku.rag.graph_common.models import ResearchPlan, SearchAnswer
 from haiku.rag.graph_common.prompts import PLAN_PROMPT, SEARCH_AGENT_PROMPT
@@ -19,16 +27,21 @@ from haiku.rag.research.prompts import (
     SYNTHESIS_AGENT_PROMPT,
 )
 from haiku.rag.research.state import ResearchDeps, ResearchState
-from pydantic_ai import Agent, RunContext
-from pydantic_ai.format_prompt import format_as_xml
-from pydantic_ai.output import ToolOutput
-from pydantic_graph.beta import Graph, GraphBuilder, StepContext
-from pydantic_graph.beta.join import reduce_list_append
 
 
 def build_research_graph(
-    provider: str, model: str
+    config: AppConfig = Config,
 ) -> Graph[ResearchState, ResearchDeps, None, ResearchReport]:
+    """Build the Research graph.
+
+    Args:
+        config: AppConfig object (uses config.research for provider, model, and graph parameters)
+
+    Returns:
+        Configured Research graph
+    """
+    provider = config.research.provider
+    model = config.research.model
     g = GraphBuilder(
         state_type=ResearchState,
         deps_type=ResearchDeps,
diff --git a/haiku_rag_slim/haiku/rag/research/state.py b/haiku_rag_slim/haiku/rag/research/state.py
index 2c748103..bfc48cbb 100644
--- a/haiku_rag_slim/haiku/rag/research/state.py
+++ b/haiku_rag_slim/haiku/rag/research/state.py
@@ -1,11 +1,16 @@
 import asyncio
 from dataclasses import dataclass
+from typing import TYPE_CHECKING
+
+from rich.console import Console
 
 from haiku.rag.client import HaikuRAG
 from haiku.rag.research.dependencies import ResearchContext
 from haiku.rag.research.models import EvaluationResult, InsightAnalysis
 from haiku.rag.research.stream import ResearchStream
-from rich.console import Console
+
+if TYPE_CHECKING:
+    from haiku.rag.config.models import AppConfig
 
 
 @dataclass
@@ -31,3 +36,23 @@ class ResearchState:
     max_concurrency: int = 1
     last_eval: EvaluationResult | None = None
     last_analysis: InsightAnalysis | None = None
+
+    @classmethod
+    def from_config(
+        cls, context: ResearchContext, config: "AppConfig"
+    ) -> "ResearchState":
+        """Create a ResearchState from an AppConfig.
+
+        Args:
+            context: The ResearchContext containing the question and settings
+            config: The AppConfig object (uses config.research for state parameters)
+
+        Returns:
+            A configured ResearchState instance
+        """
+        return cls(
+            context=context,
+            max_iterations=config.research.max_iterations,
+            confidence_threshold=config.research.confidence_threshold,
+            max_concurrency=config.research.max_concurrency,
+        )
diff --git a/tests/test_deep_qa.py b/tests/test_deep_qa.py
index 5dab9475..c220fcda 100644
--- a/tests/test_deep_qa.py
+++ b/tests/test_deep_qa.py
@@ -19,7 +19,7 @@ async def test_deep_qa_graph_end_to_end(monkeypatch, temp_db_path):
     monkeypatch.setattr("haiku.rag.graph_common.utils.get_model", test_model_factory)
     monkeypatch.setattr("haiku.rag.qa.deep.graph.get_model", test_model_factory)
 
-    graph = build_deep_qa_graph(provider="test", model="test")
+    graph = build_deep_qa_graph()
 
     state = DeepQAState(
         context=DeepQAContext(
@@ -53,7 +53,7 @@ async def test_deep_qa_with_citations(monkeypatch, temp_db_path):
     monkeypatch.setattr("haiku.rag.graph_common.utils.get_model", test_model_factory)
     monkeypatch.setattr("haiku.rag.qa.deep.graph.get_model", test_model_factory)
 
-    graph = build_deep_qa_graph(provider="test", model="test")
+    graph = build_deep_qa_graph()
 
     state = DeepQAState(
         context=DeepQAContext(original_question="What is Python?", use_citations=True),
diff --git a/tests/test_mcp.py b/tests/test_mcp.py
index 052a409f..de2956d3 100644
--- a/tests/test_mcp.py
+++ b/tests/test_mcp.py
@@ -309,9 +309,6 @@ async def test_mcp_research_question():
 
             result = await research_tool.fn(  # type: ignore[attr-defined]
                 question="Research question?",
-                max_iterations=1,
-                confidence_threshold=0.5,
-                max_concurrency=1,
             )
 
             assert result is not None
diff --git a/tests/test_research_graph.py b/tests/test_research_graph.py
index d4c41afc..0a7c0b05 100644
--- a/tests/test_research_graph.py
+++ b/tests/test_research_graph.py
@@ -6,7 +6,7 @@ from haiku.rag.research.state import ResearchState
 
 
 def test_build_graph_and_state():
-    graph = build_research_graph(provider="openai", model="gpt-4")
+    graph = build_research_graph()
     assert graph is not None
 
     state = ResearchState(
diff --git a/tests/test_research_graph_integration.py b/tests/test_research_graph_integration.py
index 8c4239f7..5bdf40a6 100644
--- a/tests/test_research_graph_integration.py
+++ b/tests/test_research_graph_integration.py
@@ -20,7 +20,7 @@ async def test_graph_end_to_end_with_test_model(monkeypatch, temp_db_path):
     monkeypatch.setattr("haiku.rag.graph_common.utils.get_model", test_model_factory)
     monkeypatch.setattr("haiku.rag.research.graph.get_model", test_model_factory)
 
-    graph = build_research_graph(provider="test", model="test")
+    graph = build_research_graph()
 
     state = ResearchState(
         context=ResearchContext(original_question="What is haiku.rag?"),