Add MCP tool import validation script for CI

.github/scripts/validate_imports.py

@@ -0,0 +1,59 @@
+"""Smoke test: verify all MCP tool modules can be imported without errors.
+
+This catches broken imports, missing dependencies, and registration issues
+that would prevent the MCP server from starting. Runs without a Databricks
+workspace connection — only validates that the Python modules load cleanly.
+"""
+
+import importlib
+import sys
+
+TOOL_MODULES = [
+    "databricks_mcp_server.tools.sql",
+    "databricks_mcp_server.tools.compute",
+    "databricks_mcp_server.tools.file",
+    "databricks_mcp_server.tools.pipelines",
+    "databricks_mcp_server.tools.jobs",
+    "databricks_mcp_server.tools.agent_bricks",
+    "databricks_mcp_server.tools.aibi_dashboards",
+    "databricks_mcp_server.tools.serving",
+    "databricks_mcp_server.tools.unity_catalog",
+    "databricks_mcp_server.tools.volume_files",
+    "databricks_mcp_server.tools.genie",
+    "databricks_mcp_server.tools.manifest",
+    "databricks_mcp_server.tools.vector_search",
+    "databricks_mcp_server.tools.lakebase",
+    "databricks_mcp_server.tools.user",
+    "databricks_mcp_server.tools.apps",
+    "databricks_mcp_server.tools.workspace",
+]
+
+CORE_MODULES = [
+    "databricks_tools_core.auth",
+    "databricks_tools_core.sql",
+    "databricks_tools_core.agent_bricks",
+    "databricks_tools_core.lakebase_autoscale",
+]
+
+
+def main():
+    errors = []
+
+    for module_name in CORE_MODULES + TOOL_MODULES:
+        try:
+            importlib.import_module(module_name)
+        except Exception as e:
+            errors.append((module_name, str(e)))
+
+    if errors:
+        print(f"FAILED: {len(errors)} module(s) failed to import:\n")
+        for module_name, error in errors:
+            print(f"  {module_name}: {error}")
+        sys.exit(1)
+    else:
+        total = len(CORE_MODULES) + len(TOOL_MODULES)
+        print(f"OK: All {total} modules imported successfully")
+
+
+if __name__ == "__main__":
+    main()