feat(chat): render shell commands as collapsible Codex-style rows

Show Bash tool calls as a compact, single-line command with a chevron
that expands to reveal the output inline, instead of hiding successful
output and popping a separate red box on error.

- Add BashCommandDisplay: command row with $ prompt, status/spinner,
  line-count hint, copy button, and an inline output panel (errors
  auto-expand and tint red).
- Add CommandRunGroup: collapse 2+ consecutive commands under one
  "Ran N commands" header; expanding reveals each command, which stays
  independently expandable. Collapsed by default; opens on error.
- Group consecutive Bash runs in ChatMessagesPane and route single Bash
  calls through BashCommandDisplay in ToolRenderer.
- Suppress the duplicate generic result section for Bash in
  MessageComponent since output now lives in the command row.
- Theme-integrated surfaces (no hard black boxes), emerald accent,
  subtle motion, and clean focus states for a modern, uncluttered look.

src/components/chat/tools/ToolRenderer.tsx

@@ -4,7 +4,7 @@ import type { Project } from '../../../types/app';
 import type { SubagentChildTool } from '../types/types';
 
 import { getToolConfig } from './configs/toolConfigs';
-import { OneLineDisplay, CollapsibleDisplay, ToolDiffViewer, MarkdownContent, FileListContent, TodoListContent, TaskListContent, TextContent, QuestionAnswerContent, SubagentContainer } from './components';
+import { OneLineDisplay, BashCommandDisplay, CollapsibleDisplay, ToolDiffViewer, MarkdownContent, FileListContent, TodoListContent, TaskListContent, TextContent, QuestionAnswerContent, SubagentContainer } from './components';
 import { PlanDisplay } from './components/PlanDisplay';
 import { ToolStatusBadge } from './components/ToolStatusBadge';
 import type { ToolStatus } from './components/ToolStatusBadge';
@@ -125,6 +125,31 @@ export const ToolRenderer: React.FC<ToolRendererProps> = memo(({
 
   if (!displayConfig) return null;
 
+  // Bash renders as a Codex-style command row: the command on a single line with
+  // a chevron that expands to show the output inline. The combined view lives on
+  // the input render; the separate result section is suppressed in MessageComponent.
+  if (toolName === 'Bash' && mode === 'input') {
+    const command = parsedData?.command || '';
+    const description = parsedData?.description;
+    const output = typeof toolResult?.content === 'string'
+      ? toolResult.content
+      : toolResult?.content != null
+        ? String(toolResult.content)
+        : '';
+    return (
+      <BashCommandDisplay
+        command={command}
+        description={description}
+        output={output}
+        isError={Boolean(toolResult?.isError)}
+        status={toolStatus !== 'completed' ? toolStatus : undefined}
+        // Commands stay collapsed by default (even consecutive ones); only
+        // failures auto-expand so they remain visible.
+        defaultOpen={false}
+      />
+    );
+  }
+
   if (displayConfig.type === 'one-line') {
     const value = displayConfig.getValue?.(parsedData) || '';
     const secondary = displayConfig.getSecondary?.(parsedData);

src/components/chat/tools/components/BashCommandDisplay.tsx

@@ -0,0 +1,155 @@
+import React, { useEffect, useRef, useState } from 'react';
+import { ChevronRight, Copy, Check } from 'lucide-react';
+
+import { cn } from '../../../../lib/utils';
+import { copyTextToClipboard } from '../../../../utils/clipboard';
+import { ToolStatusBadge } from './ToolStatusBadge';
+import type { ToolStatus } from './ToolStatusBadge';
+
+interface BashCommandDisplayProps {
+  command: string;
+  description?: string;
+  /** Combined stdout/stderr from the tool result (empty while running). */
+  output?: string;
+  isError?: boolean;
+  status?: ToolStatus;
+  defaultOpen?: boolean;
+}
+
+/**
+ * Codex-in-VSCode style command row: a compact, single-line command with a
+ * chevron on the left. When the command produced output, the row becomes a
+ * dropdown that expands to reveal the output inline. Theme-integrated surfaces
+ * keep it clean in both light and dark mode; consecutive commands stack tightly
+ * into a clean list.
+ */
+export const BashCommandDisplay: React.FC<BashCommandDisplayProps> = ({
+  command,
+  description,
+  output,
+  isError = false,
+  status,
+  defaultOpen = false,
+}) => {
+  const trimmedOutput = (output || '').replace(/\s+$/, '');
+  const hasOutput = trimmedOutput.length > 0;
+  const outputLineCount = hasOutput ? trimmedOutput.split('\n').length : 0;
+  const isRunning = status === 'running';
+  const [open, setOpen] = useState(false);
+  const [copied, setCopied] = useState(false);
+
+  // Output (and errors) often arrive after this component first mounts, so apply
+  // the auto-open intent once when there is finally something to show. After that
+  // the user is in control of the toggle.
+  const autoAppliedRef = useRef(false);
+  useEffect(() => {
+    if (!autoAppliedRef.current && hasOutput && (defaultOpen || isError)) {
+      autoAppliedRef.current = true;
+      setOpen(true);
+    }
+  }, [hasOutput, defaultOpen, isError]);
+
+  const toggle = () => {
+    if (hasOutput) {
+      setOpen((prev) => !prev);
+    }
+  };
+
+  const handleCopy = async (event: React.MouseEvent) => {
+    event.stopPropagation();
+    const didCopy = await copyTextToClipboard(command);
+    if (!didCopy) return;
+    setCopied(true);
+    setTimeout(() => setCopied(false), 2000);
+  };
+
+  return (
+    <div
+      className={cn(
+        'group/cmd overflow-hidden rounded-lg border bg-muted/40 backdrop-blur-sm transition-all duration-200',
+        isError ? 'border-red-500/30' : 'border-border/60',
+        hasOutput && !open && 'hover:border-border hover:bg-muted/60',
+        open && 'bg-muted/50 shadow-sm',
+      )}
+    >
+      {/* Command header — clickable when there is output to expand */}
+      <div
+        role={hasOutput ? 'button' : undefined}
+        tabIndex={hasOutput ? 0 : undefined}
+        aria-expanded={hasOutput ? open : undefined}
+        onClick={toggle}
+        onKeyDown={(event) => {
+          if (hasOutput && (event.key === 'Enter' || event.key === ' ')) {
+            event.preventDefault();
+            toggle();
+          }
+        }}
+        className={cn(
+          'flex items-center gap-2 px-2.5 py-1.5 outline-none',
+          hasOutput && 'cursor-pointer focus-visible:ring-1 focus-visible:ring-ring',
+        )}
+      >
+        <ChevronRight
+          className={cn(
+            'h-3.5 w-3.5 flex-shrink-0 text-muted-foreground/70 transition-transform duration-200',
+            open && 'rotate-90',
+            !hasOutput && 'opacity-0',
+          )}
+        />
+        <span className="flex-shrink-0 select-none font-mono text-xs font-semibold text-emerald-500 dark:text-emerald-400">
+          $
+        </span>
+        <code
+          className={cn(
+            'min-w-0 flex-1 font-mono text-xs text-foreground',
+            open ? 'whitespace-pre-wrap break-all' : 'truncate',
+          )}
+        >
+          {command}
+        </code>
+
+        {isRunning && (
+          <span className="h-2.5 w-2.5 flex-shrink-0 animate-spin rounded-full border-[1.5px] border-muted-foreground/30 border-t-emerald-400" />
+        )}
+        {status && status !== 'running' && <ToolStatusBadge status={status} className="flex-shrink-0" />}
+        {!open && hasOutput && !isRunning && (
+          <span className="flex-shrink-0 text-[10px] tabular-nums text-muted-foreground/70 transition-opacity group-hover/cmd:opacity-0">
+            {outputLineCount} {outputLineCount === 1 ? 'line' : 'lines'}
+          </span>
+        )}
+
+        <button
+          onClick={handleCopy}
+          className="flex-shrink-0 rounded p-0.5 text-muted-foreground/60 opacity-0 transition-all hover:bg-foreground/10 hover:text-foreground focus:opacity-100 group-hover/cmd:opacity-100"
+          title="Copy command"
+          aria-label="Copy command"
+        >
+          {copied ? <Check className="h-3.5 w-3.5 text-emerald-500" /> : <Copy className="h-3.5 w-3.5" />}
+        </button>
+      </div>
+
+      {description && !open && (
+        <div className="truncate px-2.5 pb-1.5 pl-[2.4rem] text-[11px] italic text-muted-foreground/70">
+          {description}
+        </div>
+      )}
+
+      {/* Expanded output */}
+      {open && hasOutput && (
+        <div className="settings-content-enter border-t border-border/50 bg-background/50">
+          {description && (
+            <div className="px-3 pt-2 text-[11px] italic text-muted-foreground/70">{description}</div>
+          )}
+          <pre
+            className={cn(
+              'max-h-80 overflow-auto whitespace-pre-wrap break-all px-3 py-2 font-mono text-xs leading-relaxed',
+              isError ? 'text-red-600 dark:text-red-400' : 'text-muted-foreground',
+            )}
+          >
+            {trimmedOutput}
+          </pre>
+        </div>
+      )}
+    </div>
+  );
+};

src/components/chat/tools/components/CommandRunGroup.tsx

@@ -0,0 +1,124 @@
+import React, { useEffect, useRef, useState } from 'react';
+import { ChevronRight, Terminal } from 'lucide-react';
+
+import { cn } from '../../../../lib/utils';
+import type { ChatMessage } from '../../types/types';
+import { BashCommandDisplay } from './BashCommandDisplay';
+import { ToolStatusBadge } from './ToolStatusBadge';
+import type { ToolStatus } from './ToolStatusBadge';
+
+interface CommandRunGroupProps {
+  messages: ChatMessage[];
+}
+
+type ExtractedCommand = {
+  key: string;
+  command: string;
+  description?: string;
+  output: string;
+  isError: boolean;
+  status: ToolStatus;
+};
+
+function extractCommand(message: ChatMessage, index: number): ExtractedCommand {
+  let command = '';
+  let description: string | undefined;
+  try {
+    const parsed =
+      typeof message.toolInput === 'string' ? JSON.parse(message.toolInput) : message.toolInput;
+    command = parsed?.command || '';
+    description = parsed?.description;
+  } catch {
+    command = typeof message.toolInput === 'string' ? message.toolInput : '';
+  }
+
+  const result = message.toolResult;
+  const rawContent = result?.content;
+  const output =
+    typeof rawContent === 'string' ? rawContent : rawContent != null ? String(rawContent) : '';
+  const isError = Boolean(result?.isError);
+  const status: ToolStatus = !result ? 'running' : isError ? 'error' : 'completed';
+
+  return {
+    key: message.toolId || `${command}-${index}`,
+    command,
+    description,
+    output,
+    isError,
+    status,
+  };
+}
+
+/**
+ * Groups a run of consecutive shell commands under a single collapsible header
+ * (Codex-in-VSCode style). Collapsed by default so long command runs stay tidy;
+ * expanding reveals every command in the run, each independently expandable for
+ * its own output.
+ */
+export const CommandRunGroup: React.FC<CommandRunGroupProps> = ({ messages }) => {
+  const commands = messages.map(extractCommand);
+  const count = commands.length;
+  const anyRunning = commands.some((c) => c.status === 'running');
+  const anyError = commands.some((c) => c.isError);
+
+  const [open, setOpen] = useState(false);
+
+  // Surface failed runs without a click: open once when an error first appears.
+  const autoAppliedRef = useRef(false);
+  useEffect(() => {
+    if (!autoAppliedRef.current && anyError) {
+      autoAppliedRef.current = true;
+      setOpen(true);
+    }
+  }, [anyError]);
+
+  return (
+    <div
+      className={cn(
+        'overflow-hidden rounded-xl border bg-muted/30 transition-all duration-200',
+        anyError ? 'border-red-500/30' : 'border-border/60',
+        open && 'shadow-sm',
+      )}
+    >
+      <button
+        type="button"
+        aria-expanded={open}
+        onClick={() => setOpen((prev) => !prev)}
+        className="flex w-full items-center gap-2.5 px-3 py-2 text-left outline-none transition-colors hover:bg-muted/50 focus-visible:ring-1 focus-visible:ring-ring"
+      >
+        <ChevronRight
+          className={cn(
+            'h-4 w-4 flex-shrink-0 text-muted-foreground/70 transition-transform duration-200',
+            open && 'rotate-90',
+          )}
+        />
+        <span className="grid h-6 w-6 flex-shrink-0 place-items-center rounded-md bg-emerald-500/10 text-emerald-600 dark:text-emerald-400">
+          <Terminal className="h-3.5 w-3.5" />
+        </span>
+        <span className="flex-1 text-xs font-medium text-foreground">
+          {anyRunning ? 'Running' : 'Ran'} <span className="text-muted-foreground">{count} commands</span>
+        </span>
+        {anyRunning && (
+          <span className="h-2.5 w-2.5 flex-shrink-0 animate-spin rounded-full border-[1.5px] border-muted-foreground/30 border-t-emerald-400" />
+        )}
+        {anyError && <ToolStatusBadge status="error" className="flex-shrink-0" />}
+      </button>
+
+      {open && (
+        <div className="settings-content-enter space-y-1 border-t border-border/50 p-2">
+          {commands.map((cmd) => (
+            <BashCommandDisplay
+              key={cmd.key}
+              command={cmd.command}
+              description={cmd.description}
+              output={cmd.output}
+              isError={cmd.isError}
+              status={cmd.status !== 'completed' ? cmd.status : undefined}
+              defaultOpen={false}
+            />
+          ))}
+        </div>
+      )}
+    </div>
+  );
+};

src/components/chat/tools/components/index.ts

@@ -1,6 +1,8 @@
 export { CollapsibleSection } from './CollapsibleSection';
 export { ToolDiffViewer } from './ToolDiffViewer';
 export { OneLineDisplay } from './OneLineDisplay';
+export { BashCommandDisplay } from './BashCommandDisplay';
+export { CommandRunGroup } from './CommandRunGroup';
 export { CollapsibleDisplay } from './CollapsibleDisplay';
 export { SubagentContainer } from './SubagentContainer';
 export * from './ContentRenderers';

src/components/chat/view/subcomponents/ChatMessagesPane.tsx

@@ -1,6 +1,6 @@
 import { useTranslation } from 'react-i18next';
 import { useCallback, useRef } from 'react';
-import type { Dispatch, RefObject, SetStateAction } from 'react';
+import type { Dispatch, ReactNode, RefObject, SetStateAction } from 'react';
 
 import type { ChatMessage } from '../../types/types';
 import type {
@@ -13,6 +13,7 @@ import { getIntrinsicMessageKey } from '../../utils/messageKeys';
 
 import MessageComponent from './MessageComponent';
 import ProviderSelectionEmptyState from './ProviderSelectionEmptyState';
+import { CommandRunGroup } from '../../tools';
 
 interface ChatMessagesPaneProps {
   scrollContainerRef: RefObject<HTMLDivElement>;
@@ -252,35 +253,63 @@ export default function ChatMessagesPane({
             </div>
           )}
 
-          {visibleMessages.map((message, index) => {
-            // Walk back past messages that are not actually rendered (e.g. thinking
-            // messages hidden when showThinking is off). Otherwise a hidden thinking
-            // message would make the following message look "grouped" and suppress its
-            // provider header/icon — which is why Claude turns lost their icon.
-            let prevMessage: ChatMessage | null = null;
-            for (let i = index - 1; i >= 0; i--) {
-              const candidate = visibleMessages[i];
-              if (candidate.isThinking && !showThinking) continue;
-              prevMessage = candidate;
-              break;
+          {(() => {
+            const isBashCommand = (m: ChatMessage | null | undefined) =>
+              Boolean(m && m.isToolUse && m.toolName === 'Bash' && !m.isSubagentContainer);
+
+            const items: ReactNode[] = [];
+
+            for (let index = 0; index < visibleMessages.length; index++) {
+              const message = visibleMessages[index];
+
+              // Collapse a run of 2+ consecutive shell commands under a single
+              // header so long command runs stay tidy (Codex-in-VSCode style).
+              if (isBashCommand(message)) {
+                let end = index;
+                while (end + 1 < visibleMessages.length && isBashCommand(visibleMessages[end + 1])) {
+                  end++;
+                }
+                if (end > index) {
+                  const groupMessages = visibleMessages.slice(index, end + 1);
+                  items.push(
+                    <CommandRunGroup key={getMessageKey(groupMessages[0])} messages={groupMessages} />,
+                  );
+                  index = end;
+                  continue;
+                }
+              }
+
+              // Walk back past messages that are not actually rendered (e.g. thinking
+              // messages hidden when showThinking is off). Otherwise a hidden thinking
+              // message would make the following message look "grouped" and suppress its
+              // provider header/icon — which is why Claude turns lost their icon.
+              let prevMessage: ChatMessage | null = null;
+              for (let i = index - 1; i >= 0; i--) {
+                const candidate = visibleMessages[i];
+                if (candidate.isThinking && !showThinking) continue;
+                prevMessage = candidate;
+                break;
+              }
+              items.push(
+                <MessageComponent
+                  key={getMessageKey(message)}
+                  message={message}
+                  prevMessage={prevMessage}
+                  createDiff={createDiff}
+                  onFileOpen={onFileOpen}
+                  onShowSettings={onShowSettings}
+                  onGrantToolPermission={onGrantToolPermission}
+                  autoExpandTools={autoExpandTools}
+                  showRawParameters={showRawParameters}
+                  showThinking={showThinking}
+                  selectedProject={selectedProject}
+                  provider={provider}
+                />,
+              );
             }
-            return (
-              <MessageComponent
-                key={getMessageKey(message)}
-                message={message}
-                prevMessage={prevMessage}
-                createDiff={createDiff}
-                onFileOpen={onFileOpen}
-                onShowSettings={onShowSettings}
-                onGrantToolPermission={onGrantToolPermission}
-                autoExpandTools={autoExpandTools}
-                showRawParameters={showRawParameters}
-                showThinking={showThinking}
-                selectedProject={selectedProject}
-                provider={provider}
-              />
-            );
-          })}
+
+            return items;
+          })()}
         </>
       )}
     </div>

src/components/chat/view/subcomponents/MessageComponent.tsx

@@ -218,8 +218,8 @@ const MessageComponent = memo(({ message, prevMessage, createDiff, onFileOpen, a
                   />
                 )}
 
-                {/* Tool Result Section */}
-                {message.toolResult && !shouldHideToolResult(message.toolName || 'UnknownTool', message.toolResult) && (
+                {/* Tool Result Section — Bash renders its output inside the command row above. */}
+                {message.toolResult && message.toolName !== 'Bash' && !shouldHideToolResult(message.toolName || 'UnknownTool', message.toolResult) && (
                   message.toolResult.isError ? (
                     // Error results - red error box with content
                     <div