diff --git a/src/server/connections.ts b/src/server/connections.ts
index 182b0368..47019694 100644
--- a/src/server/connections.ts
+++ b/src/server/connections.ts
@@ -165,7 +165,12 @@ export class ConnectionService {
       });
       return await use(client, bounded);
     } finally {
-      await client.close().catch(() => {});
+      await client.close().catch((error: unknown) => {
+        console.error(
+          'Failed to close MCP client:',
+          error instanceof Error ? error.message : error,
+        );
+      });
     }
   }
   private async discover(
diff --git a/src/server/parallel.ts b/src/server/parallel.ts
index cf6f6131..f8d08fbd 100644
--- a/src/server/parallel.ts
+++ b/src/server/parallel.ts
@@ -195,6 +195,11 @@ export async function parallelSources(
       throw new Error('Parallel could not extract usable source evidence.');
     return pages;
   } finally {
-    await client.close().catch(() => {});
+    await client.close().catch((error: unknown) => {
+      console.error(
+        'Failed to close MCP client:',
+        error instanceof Error ? error.message : error,
+      );
+    });
   }
 }
diff --git a/tests/parallel.test.ts b/tests/parallel.test.ts
index 82e79e9e..a0815d76 100644
--- a/tests/parallel.test.ts
+++ b/tests/parallel.test.ts
@@ -108,6 +108,22 @@ describe('Parallel research', () => {
       ),
     ).toHaveLength(1);
   });
+  it('logs MCP client close failures instead of swallowing them', async () => {
+    mcp.callTool.mockResolvedValue(result(page()));
+    mcp.close.mockRejectedValueOnce(new Error('transport gone'));
+    const error = vi.spyOn(console, 'error').mockImplementation(() => {});
+    const sources = await parallelSources(
+      { objective: 'Read', urls: ['https://example.com'] },
+      {},
+      signal,
+    );
+    expect(sources).toHaveLength(1);
+    expect(error).toHaveBeenCalledWith(
+      'Failed to close MCP client:',
+      'transport gone',
+    );
+    error.mockRestore();
+  });
   it('surfaces provider errors and closes the client', async () => {
     mcp.callTool.mockResolvedValue({
       isError: true,