diff --git a/packages/cli/src/ui/utils/MarkdownDisplay.test.tsx b/packages/cli/src/ui/utils/MarkdownDisplay.test.tsx
index 78da567b..26b807c7 100644
--- a/packages/cli/src/ui/utils/MarkdownDisplay.test.tsx
+++ b/packages/cli/src/ui/utils/MarkdownDisplay.test.tsx
@@ -9,7 +9,6 @@ import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { MarkdownDisplay } from './MarkdownDisplay.js';
 import { LoadedSettings } from '../../config/settings.js';
 import { SettingsContext } from '../contexts/SettingsContext.js';
-import { EOL } from 'node:os';
 
 describe('<MarkdownDisplay />', () => {
   const baseProps = {
@@ -57,7 +56,7 @@ describe('<MarkdownDisplay />', () => {
 ## Header 2
 ### Header 3
 #### Header 4
-`.replace(/\n/g, EOL);
+`;
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -67,10 +66,7 @@ describe('<MarkdownDisplay />', () => {
   });
 
   it('renders a fenced code block with a language', () => {
-    const text = '```javascript\nconst x = 1;\nconsole.log(x);\n```'.replace(
-      /\n/g,
-      EOL,
-    );
+    const text = '```javascript\nconst x = 1;\nconsole.log(x);\n```';
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -80,7 +76,7 @@ describe('<MarkdownDisplay />', () => {
   });
 
   it('renders a fenced code block without a language', () => {
-    const text = '```\nplain text\n```'.replace(/\n/g, EOL);
+    const text = '```\nplain text\n```';
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -90,7 +86,7 @@ describe('<MarkdownDisplay />', () => {
   });
 
   it('handles unclosed (pending) code blocks', () => {
-    const text = '```typescript\nlet y = 2;'.replace(/\n/g, EOL);
+    const text = '```typescript\nlet y = 2;';
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} isPending={true} />
@@ -104,7 +100,7 @@ describe('<MarkdownDisplay />', () => {
 - item A
 * item B
 + item C
-`.replace(/\n/g, EOL);
+`;
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -118,7 +114,7 @@ describe('<MarkdownDisplay />', () => {
 * Level 1
   * Level 2
     * Level 3
-`.replace(/\n/g, EOL);
+`;
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -131,7 +127,7 @@ describe('<MarkdownDisplay />', () => {
     const text = `
 1. First item
 2. Second item
-`.replace(/\n/g, EOL);
+`;
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -147,7 +143,7 @@ Hello
 World
 ***
 Test
-`.replace(/\n/g, EOL);
+`;
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -162,7 +158,7 @@ Test
 |----------|:--------:|
 | Cell 1   | Cell 2   |
 | Cell 3   | Cell 4   |
-`.replace(/\n/g, EOL);
+`;
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -176,7 +172,7 @@ Test
 Some text before.
 | A | B |
 |---|
-| 1 | 2 |`.replace(/\n/g, EOL);
+| 1 | 2 |`;
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -188,7 +184,7 @@ Some text before.
   it('inserts a single space between paragraphs', () => {
     const text = `Paragraph 1.
 
-Paragraph 2.`.replace(/\n/g, EOL);
+Paragraph 2.`;
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -211,7 +207,7 @@ some code
 \`\`\`
 
 Another paragraph.
-`.replace(/\n/g, EOL);
+`;
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -221,7 +217,7 @@ Another paragraph.
   });
 
   it('hides line numbers in code blocks when showLineNumbers is false', () => {
-    const text = '```javascript\nconst x = 1;\n```'.replace(/\n/g, EOL);
+    const text = '```javascript\nconst x = 1;\n```';
     const settings = new LoadedSettings(
       { path: '', settings: {} },
       { path: '', settings: {} },
@@ -242,7 +238,7 @@ Another paragraph.
   });
 
   it('shows line numbers in code blocks by default', () => {
-    const text = '```javascript\nconst x = 1;\n```'.replace(/\n/g, EOL);
+    const text = '```javascript\nconst x = 1;\n```';
     const { lastFrame } = render(
       <SettingsContext.Provider value={mockSettings}>
         <MarkdownDisplay {...baseProps} text={text} />
@@ -251,4 +247,21 @@ Another paragraph.
     expect(lastFrame()).toMatchSnapshot();
     expect(lastFrame()).toContain(' 1 ');
   });
+
+  it('correctly splits lines using \\n regardless of platform EOL', () => {
+    // Test that the component uses \n for splitting, not EOL
+    const textWithUnixLineEndings = 'Line 1\nLine 2\nLine 3';
+
+    const { lastFrame } = render(
+      <SettingsContext.Provider value={mockSettings}>
+        <MarkdownDisplay {...baseProps} text={textWithUnixLineEndings} />
+      </SettingsContext.Provider>,
+    );
+
+    const output = lastFrame();
+    expect(output).toContain('Line 1');
+    expect(output).toContain('Line 2');
+    expect(output).toContain('Line 3');
+    expect(output).toMatchSnapshot();
+  });
 });
diff --git a/packages/cli/src/ui/utils/MarkdownDisplay.tsx b/packages/cli/src/ui/utils/MarkdownDisplay.tsx
index f5cbd84b..0b6918ad 100644
--- a/packages/cli/src/ui/utils/MarkdownDisplay.tsx
+++ b/packages/cli/src/ui/utils/MarkdownDisplay.tsx
@@ -6,7 +6,6 @@
 
 import React from 'react';
 import { Text, Box } from 'ink';
-import { EOL } from 'node:os';
 import { Colors } from '../colors.js';
 import { colorizeCode } from './CodeColorizer.js';
 import { TableRenderer } from './TableRenderer.js';
@@ -35,7 +34,7 @@ const MarkdownDisplayInternal: React.FC<MarkdownDisplayProps> = ({
 }) => {
   if (!text) return <></>;
 
-  const lines = text.split(EOL);
+  const lines = text.split(`\n`);
   const headerRegex = /^ *(#{1,4}) +(.*)/;
   const codeFenceRegex = /^ *(`{3,}|~{3,}) *(\w*?) *$/;
   const ulItemRegex = /^([ \t]*)([-*+]) +(.*)/;
diff --git a/packages/cli/src/ui/utils/__snapshots__/MarkdownDisplay.test.tsx.snap b/packages/cli/src/ui/utils/__snapshots__/MarkdownDisplay.test.tsx.snap
index 223c293b..5b25cead 100644
--- a/packages/cli/src/ui/utils/__snapshots__/MarkdownDisplay.test.tsx.snap
+++ b/packages/cli/src/ui/utils/__snapshots__/MarkdownDisplay.test.tsx.snap
@@ -14,6 +14,12 @@ Another paragraph.
 "
 `;
 
+exports[`<MarkdownDisplay /> > correctly splits lines using \\n regardless of platform EOL 1`] = `
+"Line 1
+Line 2
+Line 3"
+`;
+
 exports[`<MarkdownDisplay /> > handles a table at the end of the input 1`] = `
 "Some text before.
 | A | B |