fix: return mcpToolsSummary when expectedToolCount is set even if totalCalls is 0

Co-authored-by: JReinhold <5678122+JReinhold@users.noreply.github.com>

Author: Copilot

eval/lib/graders/mcp-tools.ts

@@ -283,8 +283,9 @@ export async function gradeMcpTools(trialArgs: TrialArgs): Promise<McpToolsSumma
 			taskConfig.expectedMcpTools,
 		);
 
-		// Only return if there were any MCP tool calls
-		if (mcpToolsSummary.totalCalls > 0) {
+		// Return if there were any MCP tool calls, or if expectations were configured
+		// (so a run that ignores MCP entirely scores 0 rather than undefined)
+		if (mcpToolsSummary.totalCalls > 0 || mcpToolsSummary.expectedToolCount) {
 			return mcpToolsSummary;
 		}