diff --git a/src/renderer/components/WorkbenchControls.tsx b/src/renderer/components/WorkbenchControls.tsx
index 282ce4f..5cf1ddf 100644
--- a/src/renderer/components/WorkbenchControls.tsx
+++ b/src/renderer/components/WorkbenchControls.tsx
@@ -310,10 +310,17 @@ export const TranscriptRow = memo(function TranscriptRow({
             {entry.running ? 'Running' : entry.ok ? 'Done' : 'Failed'}
           </small>
         </summary>
-        <pre>
-          {entry.output ||
-            (entry.running ? 'Waiting for output…' : 'No output.')}
-        </pre>
+        <div className="wb-tool-section">
+          <h3>Input</h3>
+          <pre>{entry.input || 'No input.'}</pre>
+        </div>
+        <div className="wb-tool-section">
+          <h3>Output</h3>
+          <pre>
+            {entry.output ||
+              (entry.running ? 'Waiting for output…' : 'No output.')}
+          </pre>
+        </div>
       </details>
     );
   return (
diff --git a/src/renderer/timeline.ts b/src/renderer/timeline.ts
index 5522ce6..34064de 100644
--- a/src/renderer/timeline.ts
+++ b/src/renderer/timeline.ts
@@ -9,6 +9,7 @@ type Entry =
       toolId: string;
       tool: string;
       args: string;
+      input: string;
       output: string;
       running: boolean;
       ok: boolean;
@@ -55,6 +56,33 @@ function toolArgsSummary(name: string, args: Record<string, unknown> | undefined
   return JSON.stringify(args).slice(0, 120);
 }
 
+function toolInputText(name: string, args: Record<string, unknown> | undefined): string {
+  if (!args) return '';
+  if (name === 'bash') return String(args.command ?? '');
+  if (name === 'read' || name === 'write' || name === 'edit') {
+    const p = String(args.path ?? args.file ?? '');
+    const parts = [p];
+    if (name === 'write' && typeof args.content === 'string')
+      parts.push('', args.content);
+    if (name === 'edit') {
+      if (typeof args.oldText === 'string') parts.push('', 'Old:', args.oldText);
+      if (typeof args.newText === 'string') parts.push('', 'New:', args.newText);
+    }
+    if (name === 'read') {
+      const range: string[] = [];
+      if (typeof args.offset === 'number') range.push(`offset ${args.offset}`);
+      if (typeof args.limit === 'number') range.push(`limit ${args.limit}`);
+      if (range.length) parts.push(range.join(', '));
+    }
+    return parts.join('\n');
+  }
+  try {
+    return JSON.stringify(args, null, 2);
+  } catch {
+    return String(args);
+  }
+}
+
 function resultText(content: unknown): string {
   if (!Array.isArray(content)) return '';
   return content
@@ -92,6 +120,7 @@ function entriesFromMessages(messages: unknown[]): Entry[] {
             toolId: p.id,
             tool: p.name,
             args: toolArgsSummary(p.name, p.arguments),
+            input: toolInputText(p.name, p.arguments),
             output: '',
             running: false,
             ok: true,
@@ -177,6 +206,7 @@ function applyEvent(
         toolId: toolCallId,
         tool: toolName,
         args: toolArgsSummary(toolName, event.args as Record<string, unknown>),
+        input: toolInputText(toolName, event.args as Record<string, unknown>),
         output: '',
         running: true,
         ok: true,
diff --git a/src/renderer/workbench.css b/src/renderer/workbench.css
index e8c2e36..8123754 100644
--- a/src/renderer/workbench.css
+++ b/src/renderer/workbench.css
@@ -706,11 +706,22 @@ html[data-reduced-motion='true'] .wb-shell *::after {
   font-size: 12px;
   color: var(--copy);
 }
+.wb-tool-section h3 {
+  margin: 0;
+  padding: 8px 12px 0;
+  font-size: 11px;
+  font-weight: 600;
+  letter-spacing: 0.04em;
+  text-transform: uppercase;
+  color: var(--muted);
+}
+.wb-tool-section + .wb-tool-section {
+  border-top: 1px solid var(--line-soft);
+}
 .wb-tool pre {
-  padding: 12px;
+  padding: 8px 12px 12px;
   max-height: 320px;
   overflow: auto;
-  border-top: 1px solid var(--line-soft);
   margin: 0;
   white-space: pre-wrap;
   overflow-wrap: anywhere;
diff --git a/tests/integration/ToolCard.test.tsx b/tests/integration/ToolCard.test.tsx
new file mode 100644
index 0000000..534ba36
--- /dev/null
+++ b/tests/integration/ToolCard.test.tsx
@@ -0,0 +1,53 @@
+import { describe, expect, it, beforeEach } from 'vitest';
+import { render, cleanup } from '@testing-library/react';
+import { TranscriptRow } from '../../src/renderer/components/WorkbenchControls';
+import type { Entry } from '../../src/renderer/timeline';
+
+const toolEntry: Extract<Entry, { kind: 'tool' }> = {
+  key: 'tool-1',
+  kind: 'tool',
+  toolId: 'call_1',
+  tool: 'edit',
+  args: '/repo/src/app.ts',
+  input: '/repo/src/app.ts\n\nOld:\nconst before = 1;\n\nNew:\nconst after = 2;',
+  output: 'Edited /repo/src/app.ts',
+  running: false,
+  ok: true,
+};
+
+describe('<TranscriptRow> tool card', () => {
+  beforeEach(() => cleanup());
+
+  it('shows input and output as separate labelled sections when expanded', () => {
+    const expanded = new Map<string, boolean>([[toolEntry.key, true]]);
+    const { container } = render(
+      <TranscriptRow entry={toolEntry} expanded={expanded} />,
+    );
+    const headings = [...container.querySelectorAll('.wb-tool-section h3')].map(
+      (h) => h.textContent,
+    );
+    expect(headings).toEqual(['Input', 'Output']);
+    expect(container.textContent).toContain('const before = 1;');
+    expect(container.textContent).toContain('const after = 2;');
+    expect(container.textContent).toContain('Edited /repo/src/app.ts');
+    expect(container.textContent).toContain('Done');
+  });
+
+  it('shows running state and waiting output while a tool runs', () => {
+    const running: Extract<Entry, { kind: 'tool' }> = {
+      ...toolEntry,
+      key: 'tool-2',
+      tool: 'bash',
+      args: 'sleep 1',
+      input: 'sleep 1',
+      output: '',
+      running: true,
+    };
+    const expanded = new Map<string, boolean>([[running.key, true]]);
+    const { container } = render(
+      <TranscriptRow entry={running} expanded={expanded} />,
+    );
+    expect(container.textContent).toContain('Running');
+    expect(container.textContent).toContain('Waiting for output');
+  });
+});
diff --git a/tests/unit/timeline.test.ts b/tests/unit/timeline.test.ts
index 1fe00ab..d42944a 100644
--- a/tests/unit/timeline.test.ts
+++ b/tests/unit/timeline.test.ts
@@ -114,6 +114,58 @@ describe('entriesFromMessages', () => {
     }
   });
 
+  it('keeps full edit input with old and new text', () => {
+    const messages = [
+      {
+        role: 'assistant',
+        content: [
+          {
+            type: 'toolCall',
+            id: 'call_edit',
+            name: 'edit',
+            arguments: {
+              path: '/repo/src/app.ts',
+              oldText: 'const before = 1;',
+              newText: 'const after = 2;',
+            },
+          },
+        ],
+      },
+    ];
+    const [entry] = entriesFromMessages(messages);
+    if (entry?.kind === 'tool') {
+      expect(entry.args).toBe('/repo/src/app.ts');
+      expect(entry.input).toContain('/repo/src/app.ts');
+      expect(entry.input).toContain('const before = 1;');
+      expect(entry.input).toContain('const after = 2;');
+    } else {
+      expect.fail('expected tool entry');
+    }
+  });
+
+  it('does not truncate long input for other tools', () => {
+    const long = 'x'.repeat(300);
+    const messages = [
+      {
+        role: 'assistant',
+        content: [
+          {
+            type: 'toolCall',
+            id: 'call_long',
+            name: 'custom_lookup',
+            arguments: { query: long },
+          },
+        ],
+      },
+    ];
+    const [entry] = entriesFromMessages(messages);
+    if (entry?.kind === 'tool') {
+      expect(entry.input).toContain(long);
+    } else {
+      expect.fail('expected tool entry');
+    }
+  });
+
   it('interleaves user, assistant, tool, toolResult entries', () => {
     const messages = [
       { role: 'user', content: [{ type: 'text', text: 'do it' }] },
@@ -246,6 +298,7 @@ describe('applyEvent', () => {
     if (entry?.kind === 'tool') {
       expect(entry.tool).toBe('bash');
       expect(entry.args).toBe('ls');
+      expect(entry.input).toBe('ls');
       expect(entry.running).toBe(true);
     } else {
       expect.fail('expected tool');
@@ -260,6 +313,7 @@ describe('applyEvent', () => {
         toolId: 'c1',
         tool: 'bash',
         args: 'ls',
+        input: 'ls',
         output: '',
         running: true,
         ok: true,
@@ -287,6 +341,7 @@ describe('applyEvent', () => {
         toolId: 'c1',
         tool: 'bash',
         args: 'ls',
+        input: 'ls',
         output: '',
         running: true,
         ok: true,