fix: "Show in folder" reveals in the explorer instead of opening a directory in the editor

The open-path interception reroutes EVERY chat-side file open into the
sidebar editor, including the stock "Show in folder" gesture: the
ui-deliverables row passes "." (resolved to "<cwd>/." by the chat view),
so clicking it opened a bogus editor tab for the workspace directory
(host error: '"..." is a directory').

- openpath-intercept: detect the folder-reveal gesture ("." / "./" /
  "<cwd>/.") and route it to a new revealInExplorer dep instead of the editor.
- intercept: revealInExplorer switches to the explorer tab (expanding the
  panel), expands the produced files' parent directories, and highlights /
  scrolls to them; the intercepted produced-files row now also renders its
  own "Show in folder" button when files are hidden.
- produced-files: selectProducedFiles reads the engine Turn data
  (owner.turn.data.get("deliverables")) — the same source ui-deliverables
  uses — with the node replica as fallback. The old code read owner.nodes,
  which the real TurnTailOwnerProps ({turn, seq, openFile}) does not carry,
  so the takeover never claimed the chain.
- state: transient `revealed` set (never persisted) plus a revealPaths
  reducer that expands ancestor directories.
- ExplorerView: highlight + scroll revealed rows; Sidebar/tabs/service
  thread `revealed` through TabComponentProps.
- tests: folder-gesture routing, engine-data selector, wiring seat, zh/en copy.

src/client/ExplorerView.tsx

@@ -40,14 +40,17 @@ export function ExplorerView(props: {
   sessionId: string
   cwd: string | undefined
   expanded: string[]
+  /** Absolute paths to highlight ("Show in folder" reveal target rows). */
+  revealed: string[]
   onToggle: (path: string) => void
   onOpenFile: (path: string) => void
   /** Insert `@<relative path>` into the composer draft. */
   onReferenceFile: (path: string) => void
 }) {
-  const { sessionId, cwd, expanded, onToggle, onOpenFile, onReferenceFile } = props
+  const { sessionId, cwd, expanded, revealed, onToggle, onOpenFile, onReferenceFile } = props
   const [data, setData] = useState<Record<string, LevelData>>({})
   const dataRef = useRef(data)
+  const bodyRef = useRef<HTMLDivElement>(null)
   const [refreshTick, setRefreshTick] = useState(0)
   /** The row whose path was just copied ("copied" label replaces its button). */
   const [copiedPath, setCopiedPath] = useState<string | null>(null)
@@ -78,6 +81,15 @@ export function ExplorerView(props: {
     for (const dir of expanded) loadDir(dir)
   }, [cwd, expanded, refreshTick, loadDir])
 
+  const revealedKey = revealed.join('\u0000')
+  useEffect(() => {
+    if (revealedKey === '') return
+    const el = bodyRef.current?.querySelector('[data-revealed="true"]')
+    // block:"nearest" keeps an already-visible row from jumping; a level that
+    // loads AFTER the reveal re-runs this and scrolls then.
+    el?.scrollIntoView({ block: 'nearest' })
+  }, [revealedKey, data])
+
   /** Copy `text`; on success flip the row's copied label for a moment. */
   const copyPath = useCallback((text: string, path: string): void => {
     void writeClipboard(text).then((ok) => {
@@ -145,13 +157,18 @@ export function ExplorerView(props: {
     return entries.map(entry => {
       if (entry.isDir) {
         const isOpen = expanded.includes(entry.path)
+        const isRevealed = revealed.includes(entry.path)
         return (
           <div key={entry.path}>
             <div
               role="button"
               tabIndex={0}
               className={clsx(css.explorerRow, css.explorerDir, entry.hidden && css.explorerHidden)}
-              style={{ paddingLeft: depth * 22 + 6 }}
+              style={{
+                paddingLeft: depth * 22 + 6,
+                ...(isRevealed ? { background: 'var(--dsw-alias-interactive-bg-active)' } : {}),
+              }}
+              data-revealed={isRevealed || undefined}
               onClick={() => { onToggle(entry.path) }}
               onKeyDown={(event) => {
                 if (event.key === 'Enter' || event.key === ' ') {
@@ -169,13 +186,18 @@ export function ExplorerView(props: {
           </div>
         )
       }
+      const isRevealed = revealed.includes(entry.path)
       return (
         <div
           key={entry.path}
           role="button"
           tabIndex={0}
           className={clsx(css.explorerRow, entry.hidden && css.explorerHidden)}
-          style={{ paddingLeft: depth * 22 + 6 }}
+          style={{
+            paddingLeft: depth * 22 + 6,
+            ...(isRevealed ? { background: 'var(--dsw-alias-interactive-bg-active)' } : {}),
+          }}
+          data-revealed={isRevealed || undefined}
           title={entry.path}
           onClick={() => { onOpenFile(entry.path) }}
           onKeyDown={(event) => {
@@ -212,14 +234,18 @@ export function ExplorerView(props: {
           <IconRefreshOutline16 />
         </button>
       </div>
-      <div className={css.explorerBody}>
+      <div ref={bodyRef} className={css.explorerBody}>
         {root === undefined ? (
           <div className={css.explorerEmpty}>{t('noSession')}</div>
         ) : (
           <>
             <div
               className={css.explorerRow}
-              style={{ paddingLeft: 6 }}
+              style={{
+                paddingLeft: 6,
+                ...(revealed.includes(root) ? { background: 'var(--dsw-alias-interactive-bg-active)' } : {}),
+              }}
+              data-revealed={revealed.includes(root) || undefined}
               onContextMenu={(event) => { openRowMenu(event, root, true) }}
             >
               <IconFolderOpen16 size={14} />

src/client/Sidebar.tsx

@@ -61,6 +61,7 @@ function TabContent(props: {
   sessionId: string
   cwd: string | undefined
   expanded: string[]
+  revealed: string[]
   onToggleDir: (path: string) => void
   onReferenceFile: (path: string) => void
   ctx: Context
@@ -72,7 +73,7 @@ function TabContent(props: {
   /** Open a diff tab from the git panel (placement handled by the store). */
   onOpenDiff: (tab: SidebarTab) => void
 }) {
-  const { tab, sessionId, cwd, expanded, onToggleDir, onReferenceFile, ctx, store, visible, onSubagentJump, onOpenDiff } = props
+  const { tab, sessionId, cwd, expanded, revealed, onToggleDir, onReferenceFile, ctx, store, visible, onSubagentJump, onOpenDiff } = props
   const scope = { sessionId, cwd }
   const descriptor = ctx.betterSidebar?.getTab(tab.type)
   if (descriptor === undefined) {
@@ -90,7 +91,7 @@ function TabContent(props: {
     RenderBoundary,
     { className: css.tabBoundaryError },
     createElement(descriptor.component, {
-      ctx, store, scope, tab, visible, expanded,
+      ctx, store, scope, tab, visible, expanded, revealed,
       onToggleDir, onReferenceFile, onOpenDiff, onSubagentJump,
     }),
   )
@@ -714,6 +715,7 @@ export function Sidebar(props: { ctx: Context; store: SidebarStore }) {
       sessionId={sessionId}
       cwd={cwd}
       expanded={state.expanded}
+      revealed={state.revealed ?? []}
       onToggleDir={(path) => { store.reduce(s => toggleExpanded(s, path)) }}
       onReferenceFile={referenceInChat}
       ctx={ctx}

src/client/builtins/tabs.tsx

@@ -79,11 +79,12 @@ export function builtinTabs(ctx: Context): readonly TabDescriptor[] {
       icon: (size: number) => <IconFolderOpen16 size={size} />,
       order: 10,
       single: true,
-      component: ({ ctx, store, scope, expanded, onToggleDir, onReferenceFile }) => (
+      component: ({ ctx, store, scope, expanded, revealed, onToggleDir, onReferenceFile }) => (
         <ExplorerView
           sessionId={scope.sessionId}
           cwd={scope.cwd}
           expanded={expanded ?? []}
+          revealed={revealed ?? []}
           onToggle={onToggleDir ?? (() => { /* no-op */ })}
           onOpenFile={(path) => { openSidebarFile(ctx, store, scope.sessionId, path) }}
           onReferenceFile={onReferenceFile ?? (() => { /* no-op */ })}

src/client/intercept.tsx

@@ -8,7 +8,7 @@
  */
 import { IconCodeOutline16 } from '@deepseek-ai/dsh-client-ui-primitives'
 import type { Context } from '../context-types.ts'
-import type { SidebarStore } from './state.ts'
+import { revealPaths, type SidebarStore } from './state.ts'
 import { t } from './locales.ts'
 import { resolveSidebarPath, selectProducedFiles } from './produced-files.ts'
 import { wrapOpenPath } from './openpath-intercept.ts'
@@ -25,12 +25,42 @@ export function openSidebarFile(ctx: Context, store: SidebarStore, sessionId: st
   ctx.betterSidebar?.openTab({ type: 'editor', title, path: absolute, id: `editor:${absolute}` })
 }
 
+/**
+ * The produced files the turn-tail selector last matched for the visible
+ * session. The "Show in folder" gesture carries no file path of its own
+ * (`'.'`), so the reveal highlights exactly these rows when available.
+ */
+let lastProduced: readonly string[] = []
+
+/**
+ * Reveal the produced files in the sidebar explorer: expand their parent
+ * directories, highlight the rows, and focus the explorer tab (expanding the
+ * hosting panel when it is collapsed). Unknown files fall back to revealing
+ * the workspace root itself.
+ */
+export function revealInExplorer(
+  ctx: Context,
+  store: SidebarStore,
+  sessionId: string,
+  files: readonly string[],
+): void {
+  const summary = ctx.sessions.list.getSnapshot().byId[sessionId]
+  const cwd = summary?.cwd
+  const targets = files.length > 0 ? files : cwd === undefined ? [] : [cwd]
+  store.reduce(state => revealPaths(state, cwd, targets))
+  // A content open (path seed) lands in sight: the single-instance explorer
+  // tab is focused and its hosting panel expands.
+  ctx.betterSidebar?.openTab({ type: 'explorer', title: t('explorer'), path: cwd ?? '' })
+}
+
 /** The intercepted produced-files row (visual twin of the deliverables chips). */
 export function SidebarProducedFiles(props: {
   matched: readonly string[]
   openInSidebar: (path: string) => void
+  /** Reveal the produced files in the explorer ("Show in folder" twin). */
+  onShowInFolder: (files: readonly string[]) => void
 }) {
-  const { matched, openInSidebar } = props
+  const { matched, openInSidebar, onShowInFolder } = props
   const shown = matched.slice(0, 6)
   const hidden = matched.length - shown.length
   return (
@@ -53,6 +83,16 @@ export function SidebarProducedFiles(props: {
         )
       })}
       {hidden > 0 && <span className={css.producedMore}>+{hidden}</span>}
+      {hidden > 0 && (
+        <button
+          type="button"
+          className={css.producedMore}
+          style={{ cursor: 'pointer', textDecoration: 'underline', textUnderlineOffset: 2 }}
+          onClick={() => { onShowInFolder(matched) }}
+        >
+          {t('showInFolder')}
+        </button>
+      )}
     </div>
   )
 }
@@ -79,12 +119,15 @@ export function registerTurnTailInterception(ctx: Context, store: SidebarStore):
     // deliverables behavior instead of offering chips that cannot open.
     select: (owner) => {
       if (store.getPrefs().tabsEnabled['editor'] === false) return null
-      return selectProducedFiles(owner)
+      const matched = selectProducedFiles(owner)
+      if (matched !== null) lastProduced = matched
+      return matched
     },
     priority: -1,
     registrant: 'dsh-better-sidebar',
     inject: (sessionId: string) => ({
       openInSidebar: (path: string) => { openSidebarFile(ctx, store, sessionId, path) },
+      onShowInFolder: (files: readonly string[]) => { revealInExplorer(ctx, store, sessionId, files) },
     }),
   }, SidebarProducedFiles))
 }
@@ -93,9 +136,11 @@ export function registerTurnTailInterception(ctx: Context, store: SidebarStore):
  * Register the chat file-open interception: wraps `ctx.workspaces.openPath`
  * — the single funnel every chat-side file open goes through (tool-row path
  * links, the produced-files row, prose mentions) — so opens land in the
- * sidebar editor instead of the Host OS. Gated by BOTH the `interceptOpenPath`
- * pref and the editor tab's enable switch; declined opens fall through to
- * the original method. Returns the disposer restoring the original (HMR-safe).
+ * sidebar editor instead of the Host OS. The folder-reveal gesture ("Show in
+ * folder" passes `'.'`) is the one exception: it is routed to the explorer.
+ * Gated by BOTH the `interceptOpenPath` pref and the editor tab's enable
+ * switch; declined opens fall through to the original method. Returns the
+ * disposer restoring the original (HMR-safe).
  */
 export function registerOpenPathInterception(ctx: Context, store: SidebarStore): () => void {
   return wrapOpenPath(ctx.workspaces, {
@@ -103,5 +148,6 @@ export function registerOpenPathInterception(ctx: Context, store: SidebarStore):
       && store.getPrefs().tabsEnabled['editor'] !== false,
     currentSessionId: () => ctx.sessions.list.getSnapshot().current,
     openInSidebar: (path, sessionId) => { openSidebarFile(ctx, store, sessionId, path) },
+    revealInExplorer: (_path, sessionId) => { revealInExplorer(ctx, store, sessionId, lastProduced) },
   })
 }

src/client/locales.ts

@@ -89,6 +89,7 @@ export const zh = {
   historyLoadError: '加载更多历史失败',
   produced: '本次产出',
   producedOpen: '在侧边栏中打开',
+  showInFolder: '在文件夹中显示',
   disconnected: '终端连接断开，重连中…',
   exited: '终端进程已退出',
   noSession: '选择一个会话以使用侧边栏',
@@ -310,6 +311,7 @@ export const en: Record<keyof typeof zh, string> = {
   historyLoadError: 'Failed to load more history',
   produced: 'Produced',
   producedOpen: 'Open in sidebar',
+  showInFolder: 'Show in folder',
   disconnected: 'Terminal disconnected, reconnecting…',
   exited: 'Terminal process exited',
   noSession: 'Select a conversation to use the sidebar',

src/client/openpath-intercept.ts

@@ -30,13 +30,29 @@ export interface OpenPathInterceptDeps {
   currentSessionId(): string | undefined
   /** Route the open into the sidebar editor (the established openSidebarFile). */
   openInSidebar(path: string, sessionId: string): void
+  /** Route a folder-reveal gesture ("Show in folder" passes '.') into the sidebar explorer. */
+  revealInExplorer(path: string, sessionId: string): void
+}
+
+/**
+ * Whether a path is the "Show in folder" folder-reveal gesture. The stock
+ * ui-deliverables row passes `'.'` (the session workspace root, resolved by
+ * the chat view to `"<cwd>/."`); any path whose final segment is `.` is the
+ * same gesture. A directory has no editor content, so these opens must reach
+ * the explorer instead of an editor tab.
+ */
+export function isFolderRevealPath(path: string): boolean {
+  if (path === '.' || path === './') return true
+  const trimmed = path.replace(/[\\/]+$/, '')
+  return trimmed === '.' || /[\\/]\.$/.test(trimmed)
 }
 
 /**
  * Wrap `workspaces.openPath`: intercepted calls open the file in the sidebar
  * editor instead of the Host OS and resolve as success (the original's
  * callers ignore the result); anything that declines falls through to the
- * original method untouched.
+ * original method untouched. The one exception is the folder-reveal gesture,
+ * which is routed to {@link OpenPathInterceptDeps.revealInExplorer} instead.
  * @param workspaces - the client workspaces service to wrap.
  * @param deps - per-call takeover decisions.
  * @returns the disposer restoring the original method (HMR-safe).
@@ -50,7 +66,8 @@ export function wrapOpenPath(workspaces: OpenPathService, deps: OpenPathIntercep
     if (deps.takeoverEnabled()) {
       const sessionId = deps.currentSessionId()
       if (sessionId !== undefined) {
-        deps.openInSidebar(path, sessionId)
+        if (isFolderRevealPath(path)) deps.revealInExplorer(path, sessionId)
+        else deps.openInSidebar(path, sessionId)
         return Promise.resolve()
       }
     }

src/client/produced-files.ts

@@ -65,14 +65,43 @@ export function producedForClosing(nodes: readonly unknown[], seq: number): read
 
 /**
  * Claim the turn-tail chain only when the closing turn produced files.
- * @param owner - the turn-tail owner currency ({nodes, seq}).
+ *
+ * The authoritative source is the engine Turn data — the same value
+ * ui-deliverables reads (`owner.turn.data.get('deliverables')`): a
+ * `{ produced: [{ seq, path }, ...] }` record accumulated per Turn. The
+ * node-based replica below stays as a fallback for compositions that do not
+ * publish it.
+ * @param owner - the turn-tail owner currency ({turn, seq, openFile}).
  * @returns produced paths as the matched value, or null to decline.
  */
 export function selectProducedFiles(owner: unknown): readonly string[] | null {
-  const record = owner as { nodes?: unknown; seq?: unknown } | null
+  const record = owner as {
+    turn?: { data?: { get?: (key: string) => unknown } }
+    nodes?: unknown
+    seq?: unknown
+  } | null
   if (record === null || typeof record !== 'object') return null
-  if (!Array.isArray(record.nodes) || typeof record.seq !== 'number') return null
-  const paths = producedForClosing(record.nodes, record.seq)
+  const seq = typeof record.seq === 'number' ? record.seq : Number.POSITIVE_INFINITY
+  const data = record.turn?.data?.get?.('deliverables') as
+    | { produced?: unknown }
+    | null
+    | undefined
+  if (data !== null && typeof data === 'object' && Array.isArray(data.produced)) {
+    const paths: string[] = []
+    const seen = new Set<string>()
+    for (const item of data.produced) {
+      if (item === null || typeof item !== 'object') continue
+      const produced = item as { path?: unknown; seq?: unknown }
+      if (typeof produced.path !== 'string' || produced.path === '') continue
+      if (typeof produced.seq === 'number' && produced.seq > seq) continue
+      if (seen.has(produced.path)) continue
+      seen.add(produced.path)
+      paths.push(produced.path)
+    }
+    return paths.length === 0 ? null : paths
+  }
+  if (!Array.isArray(record.nodes)) return null
+  const paths = producedForClosing(record.nodes, seq)
   return paths.length === 0 ? null : paths
 }
 

src/client/service.ts

@@ -125,6 +125,8 @@ export interface TabComponentProps {
   visible: boolean
   /** The explorer's expanded directory set (ExplorerView). */
   expanded?: string[]
+  /** The explorer's reveal-highlight set (ExplorerView; "Show in folder" targets). */
+  revealed?: string[]
   onToggleDir?: (path: string) => void
   onReferenceFile?: (path: string) => void
   onOpenFile?: (path: string) => void

src/client/state.ts

@@ -72,6 +72,12 @@ export interface SidebarState {
   nextBrowser: number
   /** Explorer expansion set (absolute directory paths). */
   expanded: string[]
+  /**
+   * Explorer rows highlighted by a "Show in folder" reveal (absolute paths).
+   * Transient by design: sanitizeState never restores it, so a reload starts
+   * unhighlighted.
+   */
+  revealed: string[]
   /** The right sidebar's split tree (the original workbench). */
   splits: SplitNode
   /** Whether the bottom panel (a second, independent workbench) is open. */
@@ -162,6 +168,7 @@ export function makeDefaultState(width = PANEL_DEFAULT, panelOpen = true, seedEx
     nextTerminal: 1,
     nextBrowser: 1,
     expanded: [],
+    revealed: [],
     splits: leaf,
     bottomOpen: false,
     bottomHeight: BOTTOM_DEFAULT,
@@ -635,6 +642,33 @@ export function toggleExpanded(state: SidebarState, path: string): SidebarState
   return { ...state, expanded }
 }
 
+/**
+ * Reveal files in the explorer: expand every ancestor directory between the
+ * explorer root and each file (so the lazy tree actually shows the row) and
+ * record the paths for highlighting. The reveal set is transient —
+ * sanitizeState never restores it, so a reload starts unhighlighted.
+ * @param state - current sidebar state.
+ * @param cwd - the explorer's root (session working directory).
+ * @param files - absolute paths to highlight (parent dirs are expanded).
+ * @returns the next state, or the same reference when nothing is revealed.
+ */
+export function revealPaths(state: SidebarState, cwd: string | undefined, files: readonly string[]): SidebarState {
+  const expanded = new Set(state.expanded)
+  const revealed: string[] = []
+  const rootParts = (cwd ?? '').split(/[\\/]+/).filter(part => part !== '')
+  for (const file of files) {
+    if (typeof file !== 'string' || file === '') continue
+    revealed.push(file)
+    const parts = file.split(/[\\/]+/).filter(part => part !== '' && part !== '.')
+    const separator = file.includes('\\') ? '\\' : '/'
+    for (let i = rootParts.length; i < parts.length - 1; i++) {
+      expanded.add(parts.slice(0, i + 1).join(separator))
+    }
+  }
+  if (revealed.length === 0) return state
+  return { ...state, expanded: [...expanded], revealed }
+}
+
 /** Adjust one split divider: `i` is the left/top child index, delta in fractions. */
 export function resizeSplit(node: SplitNode, splitId: string, index: number, delta: number): SplitNode {
   if (node.kind === 'leaf') return node
@@ -836,6 +870,7 @@ export function sanitizeState(parsed: unknown): SidebarState | undefined {
     nextTerminal: record.nextTerminal,
     nextBrowser,
     expanded: record.expanded as string[],
+    revealed: [],
     splits,
     bottomOpen,
     bottomHeight,

tests/turn-tail-intercept.spec.ts

@@ -147,6 +147,12 @@ describe('turn-tail interception registration (issue #15)', () => {
     // Enabled (default): a produced turn claims the chain; an empty one declines.
     expect(select(producedOwner(['a.ts', 'b.ts']))).toEqual(['a.ts', 'b.ts'])
     expect(select(emptyOwner())).toBeNull()
+    // The engine Turn data path (the real owner currency: { turn, seq,
+    // openFile }) claims through the deliverables record too.
+    expect(select({
+      turn: { data: { get: (key: string) => key === 'deliverables' ? { produced: [{ seq: 1, path: 'a.ts' }] } : undefined } },
+      seq: 1,
+    })).toEqual(['a.ts'])
 
     // Editor tab disabled: even a produced turn falls back to the default
     // deliverables row (chips that cannot open must not be offered).
@@ -156,13 +162,14 @@ describe('turn-tail interception registration (issue #15)', () => {
     restore()
   })
 
-  it('wires the openInSidebar seat to the sidebar editor tab', () => {
+  it('wires the openInSidebar and onShowInFolder seats', () => {
     const fake = fakeSlots(true)
     const ctx = clientCtx(fake.slots)
     const store = createSidebarStore()
     const restore = registerTurnTailInterception(ctx, store)
     const inject = fake.registered[0]!.options.inject as (sessionId: string) => {
       openInSidebar: (path: string) => void
+      onShowInFolder: (files: readonly string[]) => void
     }
 
     // The seat hands the session-scoped opener to the chips row.
@@ -176,6 +183,14 @@ describe('turn-tail interception registration (issue #15)', () => {
       id: 'editor:/w/src/a.ts',
     })
 
+    // The show-in-folder seat reveals the produced files in the explorer tab.
+    expect(seat.onShowInFolder).toBeTypeOf('function')
+    seat.onShowInFolder(['/w/src/a.ts'])
+    expect(ctx.betterSidebar.openTab).toHaveBeenLastCalledWith(expect.objectContaining({
+      type: 'explorer',
+      path: '/w',
+    }))
+
     restore()
   })
 })

tests/unit.spec.ts

@@ -951,6 +951,29 @@ describe('produced-files derivation', () => {
     expect(selectProducedFiles(null)).toBeNull()
   })
 
+  it('selector reads the engine Turn data first (the same source ui-deliverables uses)', () => {
+    // The real owner currency is { turn, seq, openFile } — `turn.data` carries
+    // the deliverables `{ produced: [{ seq, path }, ...] }` record. The node
+    // replica remains a fallback for compositions that do not publish it.
+    const engineOwner = (produced: Array<{ seq: number; path: string }>, seq: number): unknown => ({
+      turn: { data: { get: (key: string) => key === 'deliverables' ? { produced } : undefined } },
+      seq,
+    })
+    expect(selectProducedFiles(engineOwner([{ seq: 1, path: 'a.ts' }, { seq: 2, path: 'b.ts' }], 2)))
+      .toEqual(['a.ts', 'b.ts'])
+    // A settlement AFTER the closing seq is excluded.
+    expect(selectProducedFiles(engineOwner([{ seq: 1, path: 'a.ts' }, { seq: 5, path: 'late.ts' }], 2)))
+      .toEqual(['a.ts'])
+    // No produced files → decline, even though the engine record exists.
+    expect(selectProducedFiles(engineOwner([], 2))).toBeNull()
+    // An engine record without a produced list falls back to the node replica.
+    expect(selectProducedFiles({
+      turn: { data: { get: () => ({}) } },
+      nodes: [diffResult('a.ts'), { kind: 'assistant', seq: 1, turn: 1 }],
+      seq: 1,
+    })).toEqual(['a.ts'])
+  })
+
   it('resolves relative paths against the session cwd', () => {
     expect(resolveSidebarPath('/work/proj', 'src/a.ts')).toBe('/work/proj/src/a.ts')
     expect(resolveSidebarPath('/work/proj', '/abs/x.ts')).toBe('/abs/x.ts')
@@ -1577,13 +1600,17 @@ describe('open-path interception', () => {
 
   const deps = (overrides: Partial<OpenPathInterceptDeps> = {}): OpenPathInterceptDeps & {
     sidebar: string[]
+    revealed: string[]
   } => {
     const sidebar: string[] = []
+    const revealed: string[] = []
     return {
       sidebar,
+      revealed,
       takeoverEnabled: () => true,
       currentSessionId: () => 's1',
       openInSidebar: (path, sessionId) => { sidebar.push(`${sessionId}:${path}`) },
+      revealInExplorer: (path, sessionId) => { revealed.push(`${sessionId}:${path}`) },
       ...overrides,
     }
   }
@@ -1630,6 +1657,23 @@ describe('open-path interception', () => {
     restore()
   })
 
+  it('routes the "Show in folder" gesture (a directory) to the explorer, not the editor', async () => {
+    const ws = service()
+    const d = deps()
+    const restore = wrapOpenPath(ws, d)
+    // The stock produced-files row passes '.' — the chat view resolves it to
+    // "<cwd>/." — a directory has no editor content, so it must reveal in the
+    // explorer instead of opening a bogus editor tab.
+    for (const gesture of ['/w/.', '/w/./', '.', './']) {
+      await ws.openPath(gesture)
+    }
+    // A real file path still routes to the sidebar editor.
+    await ws.openPath('/w/src/a.ts')
+    expect(d.sidebar).toEqual(['s1:/w/src/a.ts'])
+    expect(d.revealed).toEqual(['s1:/w/.', 's1:/w/./', 's1:.', 's1:./'])
+    restore()
+  })
+
   it('restores the original method on dispose (HMR-safe)', async () => {
     const ws = service()
     const d = deps()
@@ -1654,6 +1698,20 @@ describe('open-path interception', () => {
 })
 
 describe('open-path interception wiring', () => {
+  // The folder-reveal arm writes the reveal set through store.reduce, whose
+  // per-session persist scheduling touches window timers (see the v0.12.0
+  // store additions describe for the same stub pattern).
+  beforeEach(() => {
+    const g = globalThis as Record<string, unknown>
+    g.window = { clearTimeout: () => {}, setTimeout: () => 0, innerWidth: 1024, innerHeight: 800 }
+    g.localStorage = { getItem: () => null, setItem: () => {} }
+  })
+  afterEach(() => {
+    const g = globalThis as Record<string, unknown>
+    delete g.window
+    delete g.localStorage
+  })
+
   it('registerOpenPathInterception routes chat opens into the editor tab and restores on dispose', async () => {
     // A realistic client-context fake: the sessions list feed (current + cwd),
     // the workspaces funnel, and the sidebar service the editor goes through.
@@ -1667,6 +1725,7 @@ describe('open-path interception wiring', () => {
       betterSidebar: { openTab: (seed: unknown) => { opened.push(seed as Record<string, unknown>) } },
     } as unknown as Context
     const store = createSidebarStore()
+    store.setSession('s1')
     const original = ctx.workspaces.openPath
     const restore = registerOpenPathInterception(ctx, store)
 
@@ -1680,13 +1739,24 @@ describe('open-path interception wiring', () => {
       id: 'editor:/w/src/a.ts',
     }])
 
+    // The "Show in folder" gesture ('.' — the workspace root, resolved to
+    // "<cwd>/." by the chat view) reveals in the explorer tab instead of
+    // opening a bogus editor tab for a directory. With no cached produced
+    // files the reveal falls back to the workspace root itself.
+    await ctx.workspaces.openPath('/w/.')
+    const explorerSeed = opened.find(seed => seed.type === 'explorer') as Record<string, unknown> | undefined
+    expect(explorerSeed).toBeDefined()
+    expect(explorerSeed?.path).toBe('/w')
+    expect(store.getSnapshot().state?.revealed).toEqual(['/w'])
+
     // The interceptOpenPath pref off → the original funnel runs untouched.
     store.setPrefs({ ...store.getPrefs(), interceptOpenPath: false })
     const calls: string[] = []
     ctx.workspaces.openPath = async (path: string) => { calls.push(path) }
     await ctx.workspaces.openPath('/w/src/b.ts')
     expect(calls).toEqual(['/w/src/b.ts'])
-    expect(opened).toHaveLength(1)
+    // The editor seed plus the folder-reveal explorer seed from above.
+    expect(opened).toHaveLength(2)
 
     // The editor tab disabled → falls through too (an editor that cannot
     // open must not swallow opens).