From 70b427c7dd34ac0690e84a6133df59733bfb39e8 Mon Sep 17 00:00:00 2001
From: Jacob Richman <jacob314@gmail.com>
Date: Wed, 18 Feb 2026 22:39:54 -0800
Subject: [PATCH] fix spacing (#19494)

---
 .../src/ui/components/MainContent.test.tsx    | 59 +++++++++++++++++++
 .../__snapshots__/MainContent.test.tsx.snap   | 15 +++++
 .../components/messages/ToolGroupMessage.tsx  |  2 +-
 3 files changed, 75 insertions(+), 1 deletion(-)

diff --git a/packages/cli/src/ui/components/MainContent.test.tsx b/packages/cli/src/ui/components/MainContent.test.tsx
index eb854324cc..fce375c306 100644
--- a/packages/cli/src/ui/components/MainContent.test.tsx
+++ b/packages/cli/src/ui/components/MainContent.test.tsx
@@ -427,6 +427,65 @@ describe('MainContent', () => {
     unmount();
   });
 
+  it('renders a split tool group without a gap between static and pending areas', async () => {
+    const toolCalls = [
+      {
+        callId: 'tool-1',
+        name: 'test-tool',
+        description: 'A tool for testing',
+        resultDisplay: 'Part 1',
+        status: CoreToolCallStatus.Success,
+      } as IndividualToolCallDisplay,
+    ];
+
+    const pendingToolCalls = [
+      {
+        callId: 'tool-2',
+        name: 'test-tool',
+        description: 'A tool for testing',
+        resultDisplay: 'Part 2',
+        status: CoreToolCallStatus.Success,
+      } as IndividualToolCallDisplay,
+    ];
+
+    const uiState = {
+      ...defaultMockUiState,
+      history: [
+        {
+          id: 1,
+          type: 'tool_group' as const,
+          tools: toolCalls,
+          borderBottom: false,
+        },
+      ],
+      pendingHistoryItems: [
+        {
+          type: 'tool_group' as const,
+          tools: pendingToolCalls,
+          borderTop: false,
+          borderBottom: true,
+        },
+      ],
+    };
+
+    const { lastFrame, waitUntilReady, unmount } = renderWithProviders(
+      <MainContent />,
+      {
+        uiState: uiState as Partial<UIState>,
+      },
+    );
+    await waitUntilReady();
+
+    const output = lastFrame();
+    // Verify Part 1 and Part 2 are rendered.
+    expect(output).toContain('Part 1');
+    expect(output).toContain('Part 2');
+
+    // The snapshot will be the best way to verify there is no gap (empty line) between them.
+    expect(output).toMatchSnapshot();
+    unmount();
+  });
+
   describe('MainContent Tool Output Height Logic', () => {
     const testCases = [
       {
diff --git a/packages/cli/src/ui/components/__snapshots__/MainContent.test.tsx.snap b/packages/cli/src/ui/components/__snapshots__/MainContent.test.tsx.snap
index 8fbe2bd11e..29eda04bab 100644
--- a/packages/cli/src/ui/components/__snapshots__/MainContent.test.tsx.snap
+++ b/packages/cli/src/ui/components/__snapshots__/MainContent.test.tsx.snap
@@ -107,3 +107,18 @@ exports[`MainContent > MainContent Tool Output Height Logic > 'Normal mode - Unc
 ShowMoreLines
 "
 `;
+
+exports[`MainContent > renders a split tool group without a gap between static and pending areas 1`] = `
+"AppHeader(full)
+╭──────────────────────────────────────────────────────────────────────────────────────────────╮
+│ ✓  test-tool A tool for testing                                                              │
+│                                                                                              │
+│ Part 1                                                                                       │
+│                                                                                              │
+│ ✓  test-tool A tool for testing                                                              │
+│                                                                                              │
+│ Part 2                                                                                       │
+╰──────────────────────────────────────────────────────────────────────────────────────────────╯
+ShowMoreLines
+"
+`;
diff --git a/packages/cli/src/ui/components/messages/ToolGroupMessage.tsx b/packages/cli/src/ui/components/messages/ToolGroupMessage.tsx
index c9c7171277..f4e1c200db 100644
--- a/packages/cli/src/ui/components/messages/ToolGroupMessage.tsx
+++ b/packages/cli/src/ui/components/messages/ToolGroupMessage.tsx
@@ -148,7 +148,7 @@ export const ToolGroupMessage: React.FC<ToolGroupMessageProps> = ({
       */
       width={terminalWidth}
       paddingRight={TOOL_MESSAGE_HORIZONTAL_MARGIN}
-      marginBottom={1}
+      marginBottom={borderBottomOverride === false ? 0 : 1}
     >
       {visibleToolCalls.map((tool, index) => {
         const isFirst = index === 0;