diff --git a/conftest.py b/conftest.py
new file mode 100644
index 0000000..6545b4d
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,7 @@
+import sys
+from pathlib import Path
+
+# Ensure src/ package takes precedence over the legacy root-level governs_ai/ directory
+_src = str(Path(__file__).parent / "src")
+if _src not in sys.path:
+    sys.path.insert(0, _src)
diff --git a/governs_ai/exceptions/precheck.py b/governs_ai/exceptions/precheck.py
index 37e4843..4b6eb34 100644
--- a/governs_ai/exceptions/precheck.py
+++ b/governs_ai/exceptions/precheck.py
@@ -4,6 +4,8 @@
 Precheck-specific exceptions.
 """
 
+from typing import Any, Dict, Optional
+
 from .base import GovernsAIError
 
 
diff --git a/pyproject.toml b/pyproject.toml
index ed2884d..baefc8e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,6 +29,14 @@ dev = [
     "mypy>=1.0.0",
 ]
 
+[tool.setuptools.packages.find]
+where = ["src"]
+
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
 testpaths = ["tests"]
+pythonpath = ["src"]
+addopts = "--import-mode=importlib"
+markers = [
+    "integration: requires running local services (deselect with '-m not integration')",
+]
diff --git a/tests/integration/__init__.py b/tests/integration/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/integration/test_precheck_integration.py b/tests/integration/test_precheck_integration.py
new file mode 100644
index 0000000..a19345d
--- /dev/null
+++ b/tests/integration/test_precheck_integration.py
@@ -0,0 +1,36 @@
+"""Integration tests for precheck() — require local precheck service on localhost:8000."""
+
+import os
+
+import pytest
+
+from governs_ai.client import GovernsAIClient
+
+
+@pytest.fixture
+def client():
+    return GovernsAIClient(
+        api_key=os.getenv("GOVERNS_API_KEY", "dev-key"),
+        base_url=os.getenv("GOVERNS_BASE_URL", "http://localhost:8000"),
+        org_id=os.getenv("GOVERNS_ORG_ID", "org-dev"),
+    )
+
+
+@pytest.mark.integration
+def test_precheck_returns_real_decision(client):
+    """precheck() against local service returns a valid decision."""
+    result = client.precheck(content="Hello from integration test", tool="model.chat")
+    assert result.decision in ("allow", "deny", "transform", "confirm")
+    assert isinstance(result.redacted_content, str)
+    assert isinstance(result.reasons, list)
+    assert result.latency_ms > 0
+
+
+@pytest.mark.integration
+async def test_async_precheck_returns_real_decision(client):
+    """async_precheck() against local service returns a valid decision."""
+    result = await client.async_precheck(
+        content="Hello from async integration test", tool="model.chat"
+    )
+    assert result.decision in ("allow", "deny", "transform", "confirm")
+    assert result.latency_ms > 0