diff --git a/agents/tests/unit/test_agent.py b/agents/tests/unit/test_agent.py
new file mode 100644
index 0000000..a8db4d5
--- /dev/null
+++ b/agents/tests/unit/test_agent.py
@@ -0,0 +1,108 @@
+# agents/tests/unit/test_agent.py
+# OSVauco-NMTMD-GCOS — Unit tests for ADK orchestrator agent
+# Run: pytest agents/tests/unit/ -v
+
+import os
+import sys
+import pytest
+
+# ── path setup ───────────────────────────────────────────────
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "core-logic"))
+
+
+# ─────────────────────────────────────────────────────────────
+# Test 1: Python version
+# ─────────────────────────────────────────────────────────────
+def test_python_version():
+    """Require Python 3.11 or higher."""
+    assert sys.version_info >= (3, 11), (
+        f"Python 3.11+ required, got {sys.version_info.major}.{sys.version_info.minor}"
+    )
+
+
+# ─────────────────────────────────────────────────────────────
+# Test 2: ADK import
+# ─────────────────────────────────────────────────────────────
+def test_adk_import():
+    """google-adk must be importable."""
+    try:
+        import google.adk  # noqa: F401
+    except ImportError as e:
+        pytest.fail(f"google-adk not importable: {e}")
+
+
+# ─────────────────────────────────────────────────────────────
+# Test 3: Agent import
+# ─────────────────────────────────────────────────────────────
+def test_agent_import():
+    """agents/core-logic/agent.py must export root_agent."""
+    try:
+        from agent import root_agent  # noqa: F401
+    except ImportError as e:
+        pytest.skip(f"Skipping — dependencies not installed: {e}")
+    except Exception as e:
+        pytest.fail(f"Unexpected error importing root_agent: {e}")
+
+
+# ─────────────────────────────────────────────────────────────
+# Test 4: Required env vars present
+# ─────────────────────────────────────────────────────────────
+REQUIRED_ENV_VARS = [
+    "PROJECT_ID",
+    "REGION",
+    "ORCHESTRATOR_MODEL",
+    "SUBAGENT_MODEL",
+]
+
+@pytest.mark.parametrize("var", REQUIRED_ENV_VARS)
+def test_required_env_var(var):
+    """All required env vars must be set (non-empty)."""
+    val = os.environ.get(var, "")
+    assert val, f"Required env var '{var}' is not set or empty"
+
+
+# ─────────────────────────────────────────────────────────────
+# Test 5: RAG env vars present if RAG enabled
+# ─────────────────────────────────────────────────────────────
+def test_rag_env_vars():
+    """If RAG_CORPUS_NAME is set, related vars must also be set."""
+    corpus = os.environ.get("RAG_CORPUS_NAME", "")
+    if not corpus:
+        pytest.skip("RAG_CORPUS_NAME not set — skipping RAG env var check")
+    assert os.environ.get("RAG_CORPUS_DISPLAY_NAME"), "RAG_CORPUS_DISPLAY_NAME must be set"
+
+
+# ─────────────────────────────────────────────────────────────
+# Test 6: Memory Bank env vars present if enabled
+# ─────────────────────────────────────────────────────────────
+def test_memory_bank_env_vars():
+    """If MEMORY_BANK_INSTANCE is set, related vars must also be set."""
+    mb = os.environ.get("MEMORY_BANK_INSTANCE", "")
+    if not mb:
+        pytest.skip("MEMORY_BANK_INSTANCE not set — skipping Memory Bank env var check")
+    assert os.environ.get("MEMORY_INSTANCE_DISPLAY_NAME"), "MEMORY_INSTANCE_DISPLAY_NAME must be set"
+
+
+# ─────────────────────────────────────────────────────────────
+# Test 7: Safety callback smoke test
+# ─────────────────────────────────────────────────────────────
+def test_safety_callback_import():
+    """before_model_callback must be importable from agent module."""
+    try:
+        from agent import before_model_callback  # noqa: F401
+    except ImportError as e:
+        pytest.skip(f"Skipping — dependencies not installed: {e}")
+    except Exception as e:
+        pytest.fail(f"Unexpected error importing before_model_callback: {e}")
+
+
+# ─────────────────────────────────────────────────────────────
+# Test 8: cloudbuild.yaml exists
+# ─────────────────────────────────────────────────────────────
+def test_cloudbuild_yaml_exists():
+    """cloudbuild.yaml must exist at repo root."""
+    repo_root = os.path.abspath(
+        os.path.join(os.path.dirname(__file__), "..", "..", "..")
+    )
+    cb_path = os.path.join(repo_root, "cloudbuild.yaml")
+    assert os.path.isfile(cb_path), f"cloudbuild.yaml not found at {cb_path}"