diff --git a/src/client/components/contextView.tsx b/src/client/components/contextView.tsx
index 273dce2..50f98af 100644
--- a/src/client/components/contextView.tsx
+++ b/src/client/components/contextView.tsx
@@ -220,9 +220,12 @@ export function makeContextView(
       [briefList, convOf, filesBefore],
     )
     const locateFileOp = React.useCallback((op: FileOp): void => {
-      const step = locateStepOf(requests, op.seq, op.gone)
+      // A nested Code-Mode op has no surface row of its own — it reveals on
+      // its parent run_code result (whose removal stamp the op carries).
+      const seq = op.parent ?? op.seq
+      const step = locateStepOf(requests, seq, op.gone)
       if (step === null) return
-      setNodeFocus({ step, seq: op.seq, cat: 'tool' })
+      setNodeFocus({ step, seq, cat: 'tool' })
     }, [requests])
     // A brief row's reveal target: inputs/opener live in the picked step's OWN assembled surface; the response node (seq === the
     // request's) first appears in the NEXT step's surface — or the live surface when the last bar is picked.
diff --git a/src/client/components/fileCard.tsx b/src/client/components/fileCard.tsx
index 4624e3e..a885ac5 100644
--- a/src/client/components/fileCard.tsx
+++ b/src/client/components/fileCard.tsx
@@ -98,6 +98,11 @@ export function makeFileCard(kit: ViewKit, settings: ContextSettings): ReactNS.C
         <span className="lc-fa-op-time">{op.time !== undefined ? fmtTime(op.time) : '—'}</span>
         <span className="lc-fa-op-tool">{op.tool}</span>
         {op.detail !== undefined ? <span className="lc-fa-op-detail">{op.detail}</span> : null}
+        {op.hits !== undefined ? <span className="lc-fa-op-detail">{t('files.hits', { n: fmt(op.hits) })}</span> : null}
+        {/* A nested PTC op with nothing else to say still tells why: its program's description. */}
+        {op.detail === undefined && op.hits === undefined && op.program !== undefined
+          ? <span className="lc-fa-op-detail">{op.program}</span>
+          : null}
         {op.added + op.removed > 0 ? <DeltaPair added={op.added} removed={op.removed} /> : null}
         {op.err ? <span className="lc-br-err-dot" title={t('node.failed')} /> : null}
       </>
@@ -197,12 +202,15 @@ export function makeFileCard(kit: ViewKit, settings: ContextSettings): ReactNS.C
                       </button>
                       {open ? (
                         <div className="lc-fa-ops">
-                          {e.ops.map((op) => {
+                          {e.ops.map((op, i) => {
                             const onLocate = props.onLocate
+                            // A meta-attributed search rows one op per matched file off ONE
+                            // result — the ops share that result's seq, so the key joins the index.
+                            const key = `${op.seq}:${i}`
                             return onLocate !== undefined
                               ? (
                                 <button
-                                  key={op.seq}
+                                  key={key}
                                   type="button"
                                   className="lc-fa-op lc-fa-op-link"
                                   title={t('files.locate')}
@@ -211,7 +219,7 @@ export function makeFileCard(kit: ViewKit, settings: ContextSettings): ReactNS.C
                                   {opLine(op)}
                                 </button>
                               )
-                              : <div key={op.seq} className="lc-fa-op">{opLine(op)}</div>
+                              : <div key={key} className="lc-fa-op">{opLine(op)}</div>
                           })}
                         </div>
                       ) : null}
diff --git a/src/client/fileActivity.ts b/src/client/fileActivity.ts
index da4fc82..67a0b48 100644
--- a/src/client/fileActivity.ts
+++ b/src/client/fileActivity.ts
@@ -3,11 +3,19 @@
  * timeline's served tool-result nodes (live tail + archive) joined with the
  * conversation snapshot for call arguments; no host or wire additions.
  *
- * One tool-result surface node equals one executed call; a call whose
+ * One top-level tool-result surface node equals one executed call. Code Mode
+ * (PTC) runs nested calls instead — those ride the conversation node's
+ * `subCalls` tree, and each settled sub-dispatch folds as one op attributed
+ * to the nested tool and located on its parent run_code result. A call whose
  * arguments have aged out of the conversation join names no target and is
  * skipped — every op the card counts, it can also row. Line deltas are
- * estimates read off the call ARGUMENTS (an
- * edit's old/new strings, a write's content), never off result payloads.
+ * estimates read off the call ARGUMENTS (an edit's old/new strings, a write's
+ * content), never off result payloads.
+ *
+ * A search resolves further when its result's bounded presentation meta names
+ * the matched files: the ops then row per real file (with the match count),
+ * and only a capped or malformed meta falls back to the call's own target —
+ * the narrowing path, else the searched pattern.
  *
  * Scope: `before` is the EXCLUSIVE upper seq bound (the next request's seq),
  * so the picked step's own calls — whose results land before the next
@@ -34,6 +42,16 @@ export interface FileOp {
   removed: number
   /** What was searched for, when a search named both a path and a pattern. */
   detail?: string
+  /**
+   * Nested Code-Mode op only: the run_code result node the op ran under — the
+   * locate target, because the op's own seq names the dispatch event, which
+   * has no surface row. `gone` is the parent's stamp.
+   */
+  parent?: number
+  /** Nested Code-Mode op only: the run_code program's model-authored description — why the file was touched. */
+  program?: string
+  /** Meta-attributed search op only: matched lines the result reported for this file. */
+  hits?: number
 }
 
 /** One file's aggregated activity; `ops` newest first. */
@@ -72,6 +90,18 @@ export function kindOfTool(tool: string | undefined): FileOpKind | null {
   return KIND_BY_TOOL[tool] ?? null
 }
 
+/**
+ * The file purpose of one executed call. Like {@link kindOfTool} except for
+ * the one file tool whose purpose follows its arguments: `str_replace_editor`
+ * reads on `view` and writes on every other command (create / str_replace /
+ * insert — an unknown command writes too; the call failed and the row keeps
+ * its error flag).
+ */
+export function kindOfCall(tool: string, args: Record<string, unknown> | null): FileOpKind | null {
+  if (tool === 'str_replace_editor') return args !== null && args.command === 'view' ? 'read' : 'write'
+  return kindOfTool(tool)
+}
+
 /**
  * The operation's target path: the path-ish argument of read/write tools;
  * for searches the narrowing `path`, else the pattern itself (a pathless
@@ -100,24 +130,28 @@ export function linesOf(s: string): number {
   return s.endsWith('\n') ? n : n + 1
 }
 
+/** The added/removed pair of one content-bearing argument set, or zeros. */
+function pairOf(added: unknown, removed: unknown): { added: number; removed: number } {
+  return {
+    added: typeof added === 'string' ? linesOf(added) : 0,
+    removed: typeof removed === 'string' ? linesOf(removed) : 0,
+  }
+}
+
 /**
  * The signed line footprint of one call: an edit removes its old string and
  * adds its new one; a write adds its content (the pre-existing body, if any,
- * is unknowable from the arguments — the estimate stays honest about that).
- * Callers reach here only with parsed args (a null parse yields no path).
+ * is unknowable from the arguments — the estimate stays honest about that);
+ * `str_replace_editor` splits the same shapes across its commands. Callers
+ * reach here only with parsed args (a null parse yields no path).
  */
 function deltaOf(tool: string, args: Record<string, unknown>): { added: number; removed: number } {
-  if (tool === 'edit') {
-    const oldS = args.old_string
-    const newS = args.new_string
-    return {
-      added: typeof newS === 'string' ? linesOf(newS) : 0,
-      removed: typeof oldS === 'string' ? linesOf(oldS) : 0,
-    }
-  }
-  if (tool === 'write') {
-    const content = args.content
-    return { added: typeof content === 'string' ? linesOf(content) : 0, removed: 0 }
+  if (tool === 'edit') return pairOf(args.new_string, args.old_string)
+  if (tool === 'write') return pairOf(args.content, undefined)
+  if (tool === 'str_replace_editor') {
+    if (args.command === 'str_replace') return pairOf(args.new_str, args.old_str)
+    if (args.command === 'insert') return pairOf(args.new_str, undefined)
+    if (args.command === 'create') return pairOf(args.file_text, undefined)
   }
   return { added: 0, removed: 0 }
 }
@@ -131,6 +165,138 @@ export function formOf(tool: string, path: string): FileForm {
   return 'text'
 }
 
+/**
+ * A search op's detail: the pattern, with the include filter appended when
+ * one narrowed the call. A patternless (malformed) search has no detail.
+ */
+function searchDetailOf(args: Record<string, unknown> | null): string | undefined {
+  const pattern = args?.pattern
+  if (typeof pattern !== 'string' || pattern === '') return undefined
+  const include = args?.include
+  return typeof include === 'string' && include !== '' ? `${pattern} (${include})` : pattern
+}
+
+/**
+ * The files a search demonstrably reached, read off the result's bounded
+ * presentation meta (grep groups matched lines by file; glob lists paths).
+ * Only the COMPLETE list attributes: a capped search (`truncated`) names a
+ * partial file set, and a malformed meta names none — both fall back to the
+ * call's own target. Each entry carries the reported match count.
+ */
+function searchFilesOf(meta: unknown): { path: string; hits: number }[] | null {
+  if (meta === null || typeof meta !== 'object') return null
+  const m = meta as { shape?: unknown; truncated?: unknown; files?: unknown; paths?: unknown }
+  if (m.truncated !== false) return null
+  const files: { path: string; hits: number }[] = []
+  if (m.shape === 'matches' && Array.isArray(m.files)) {
+    for (const f of m.files) {
+      if (f === null || typeof f !== 'object') continue
+      const group = f as { path?: unknown; matches?: unknown }
+      if (typeof group.path === 'string' && group.path !== '' && Array.isArray(group.matches)) {
+        files.push({ path: group.path, hits: group.matches.length })
+      }
+    }
+  } else if (m.shape === 'paths' && Array.isArray(m.paths)) {
+    for (const p of m.paths) {
+      if (typeof p === 'string' && p !== '') files.push({ path: p, hits: 0 })
+    }
+  }
+  return files.length > 0 ? files : null
+}
+
+/** One settled nested call of a Code-Mode tree, as far as the fold consumes it. */
+interface SubCall {
+  name: string
+  argsRaw: string
+  seq: number
+  time?: number
+  err: boolean
+  subCalls?: readonly unknown[]
+}
+
+/**
+ * Narrow one block of a conversation node's `subCalls` tree to a settled
+ * nested call, or null. The join is defensive — a running call has no result
+ * kind yet, and any malformed block is dropped, never thrown. (Null and
+ * non-object blocks never reach here: the folding loop pre-filters them.)
+ */
+function subCallOf(block: unknown): SubCall | null {
+  const b = block as Record<string, unknown>
+  if (b.kind !== 'tool-result') return null
+  if (b.call === null || typeof b.call !== 'object') return null
+  const call = b.call as { name?: unknown; argsRaw?: unknown }
+  if (typeof call.name !== 'string' || typeof call.argsRaw !== 'string') return null
+  if (typeof b.seq !== 'number' || !Number.isFinite(b.seq)) return null
+  return {
+    name: call.name,
+    argsRaw: call.argsRaw,
+    seq: b.seq,
+    ...(typeof b.time === 'number' ? { time: b.time } : {}),
+    ...(b.isError === true ? { err: true } : { err: false }),
+    ...(Array.isArray(b.subCalls) ? { subCalls: b.subCalls } : {}),
+  }
+}
+
+/** The run_code call's model-authored description — the nested ops' "why". */
+function programOf(conv: ConversationNodeLike | undefined): string | undefined {
+  const description = parseCallArgs(conv?.call?.argsRaw)?.description
+  return typeof description === 'string' && description !== '' ? description : undefined
+}
+
+/**
+ * Depth guard for nested Code-Mode trees. The SDK bindings exclude `run_code`
+ * itself, so a real tree is one level deep; the cap only bounds defensive
+ * re-entry over a malformed join.
+ */
+const SUBCALL_MAX_DEPTH = 8
+
+/**
+ * Fold one nested Code-Mode tree: every settled sub-dispatch whose arguments
+ * resolve to a file target books one op, attributed to the nested tool and
+ * located on the parent run_code result. `seen` holds the already-visited
+ * blocks, so a malformed (cyclic) join cannot loop.
+ */
+function foldSubCalls(
+  blocks: readonly unknown[],
+  parent: SurfaceNode,
+  program: string | undefined,
+  add: (op: FileOp, path: string) => void,
+  seen: Set<object>,
+  depth: number,
+): void {
+  if (depth > SUBCALL_MAX_DEPTH) return
+  for (const block of blocks) {
+    if (block === null || typeof block !== 'object' || seen.has(block)) continue
+    seen.add(block)
+    const sub = subCallOf(block)
+    if (sub !== null) {
+      const args = parseCallArgs(sub.argsRaw)
+      const kind = args !== null ? kindOfCall(sub.name, args) : null
+      const path = kind !== null ? pathOfArgs(sub.name, args) : null
+      if (args !== null && kind !== null && path !== null) {
+        const { added, removed } = deltaOf(sub.name, args)
+        const detail = kind === 'search' && typeof args.path === 'string' && args.path !== ''
+          ? searchDetailOf(args)
+          : undefined
+        add({
+          seq: sub.seq,
+          ...(parent.gone !== undefined ? { gone: parent.gone } : {}),
+          kind,
+          tool: sub.name,
+          ...(sub.time !== undefined ? { time: sub.time } : {}),
+          err: sub.err,
+          added,
+          removed,
+          ...(detail !== undefined ? { detail } : {}),
+          parent: parent.seq,
+          ...(program !== undefined ? { program } : {}),
+        }, path)
+      }
+      if (sub.subCalls !== undefined) foldSubCalls(sub.subCalls, parent, program, add, seen, depth + 1)
+    }
+  }
+}
+
 /** Fold every served tool-result node into per-file activity. */
 export function activityOf(
   nodes: SurfaceNode[],
@@ -146,51 +312,85 @@ export function activityOf(
     removed: 0,
   }
   const byPath = new Map<string, FileEntry>()
+  /** Book one executed op under its file; the totals and the entry move together. */
+  const add = (op: FileOp, path: string): void => {
+    totals[op.kind].ops++
+    let entry = byPath.get(path)
+    if (entry === undefined) {
+      entry = { path, form: formOf(op.tool, path), reads: 0, writes: 0, searches: 0, added: 0, removed: 0, errs: 0, ops: [] }
+      byPath.set(path, entry)
+    }
+    if (op.kind === 'read') entry.reads++
+    else if (op.kind === 'write') entry.writes++
+    else entry.searches++
+    entry.added += op.added
+    entry.removed += op.removed
+    if (op.err) entry.errs++
+    entry.ops.push(op)
+  }
   for (const n of nodes) {
     if (n.cat !== 'tool') continue
     if (before !== null && n.seq >= before) continue
-    const kind = kindOfTool(n.tool)
-    /* kind non-null ⟹ n.tool defined (kindOfTool's only other exit). */
-    if (kind === null) continue
-    const tool = n.tool as string
+    const tool = n.tool
+    if (tool === undefined) continue
     const conv = convOf(n.seq)
-    const args = parseCallArgs(conv?.call?.argsRaw)
-    const path = pathOfArgs(tool, args)
-    // A file-kind call whose arguments aged out of the retained window (or
-    // name no target) has nothing to row — skipped, so counted means shown.
-    // The args check narrows `args` for the delta/detail reads below.
-    if (path === null || args === null) continue
-    totals[kind].ops++
-    const { added, removed } = deltaOf(tool, args)
-    const detail = kind === 'search'
-      && typeof args.path === 'string' && args.path !== ''
-      && typeof args.pattern === 'string' && args.pattern !== ''
-      ? args.pattern
-      : undefined
-    const op: FileOp = {
-      seq: n.seq,
-      ...(n.gone !== undefined ? { gone: n.gone } : {}),
-      kind,
-      tool,
-      ...(n.time !== undefined ? { time: n.time } : {}),
-      // Parsed args ⟹ the conversation join carried this call; the assertion just restates it.
-      err: n.err === true || (conv as ConversationNodeLike).isError === true,
-      added,
-      removed,
-      ...(detail !== undefined ? { detail } : {}),
+    const staticKind = kindOfTool(tool)
+    // Args are read for the file-kind tools only — any other call (bash, web
+    // search…) contributes nothing at the top level and walks only its
+    // nested tree, if any.
+    const args = staticKind !== null || tool === 'str_replace_editor'
+      ? parseCallArgs(conv?.call?.argsRaw)
+      : null
+    const kind = staticKind ?? kindOfCall(tool, args)
+    if (kind !== null) {
+      const err = n.err === true || (conv as ConversationNodeLike).isError === true
+      // A search whose result meta carries the COMPLETE matched-file list
+      // rows its ops per real file; a capped or malformed meta falls back to
+      // the call's own target (the narrowing path, else the pattern).
+      const files = kind === 'search' ? searchFilesOf(conv?.meta) : null
+      if (files !== null) {
+        const detail = searchDetailOf(args)
+        for (const f of files) {
+          add({
+            seq: n.seq,
+            ...(n.gone !== undefined ? { gone: n.gone } : {}),
+            kind,
+            tool,
+            ...(n.time !== undefined ? { time: n.time } : {}),
+            err,
+            added: 0,
+            removed: 0,
+            ...(detail !== undefined ? { detail } : {}),
+            ...(f.hits > 0 ? { hits: f.hits } : {}),
+          }, f.path)
+        }
+      } else if (args !== null) {
+        const path = pathOfArgs(tool, args)
+        if (path !== null) {
+          const { added, removed } = deltaOf(tool, args)
+          const detail = kind === 'search'
+            && typeof args.path === 'string' && args.path !== ''
+            ? searchDetailOf(args)
+            : undefined
+          add({
+            seq: n.seq,
+            ...(n.gone !== undefined ? { gone: n.gone } : {}),
+            kind,
+            tool,
+            ...(n.time !== undefined ? { time: n.time } : {}),
+            err,
+            added,
+            removed,
+            ...(detail !== undefined ? { detail } : {}),
+          }, path)
+        }
+      }
     }
-    let entry = byPath.get(path)
-    if (entry === undefined) {
-      entry = { path, form: formOf(tool, path), reads: 0, writes: 0, searches: 0, added: 0, removed: 0, errs: 0, ops: [] }
-      byPath.set(path, entry)
+    // Nested Code-Mode calls (PTC): one settled sub-dispatch is one op.
+    const subCalls = conv?.subCalls
+    if (subCalls !== undefined && subCalls.length > 0) {
+      foldSubCalls(subCalls, n, programOf(conv), add, new Set<object>(), 1)
     }
-    if (kind === 'read') entry.reads++
-    else if (kind === 'write') entry.writes++
-    else entry.searches++
-    entry.added += added
-    entry.removed += removed
-    if (op.err) entry.errs++
-    entry.ops.push(op)
   }
   const entries = [...byPath.values()]
   for (const e of entries) {
diff --git a/src/client/i18n.ts b/src/client/i18n.ts
index d91ac34..d11da0d 100644
--- a/src/client/i18n.ts
+++ b/src/client/i18n.ts
@@ -79,6 +79,7 @@ export const DICT_ZH: Record<string, string> = {
   'files.empty': '该范围内没有文件读取、写入或搜索操作',
   'files.noMatch': '没有匹配当前过滤条件的文件',
   'files.locate': '在上下文浏览器中查看此次操作',
+  'files.hits': '{n} 处命中',
   'files.errs': '{n} 次失败',
   'files.form.image': '图片', 'files.form.dir': '目录', 'files.form.text': '文件',
   'agents.title': 'Agent 网络',
@@ -239,6 +240,7 @@ export const DICT_EN: Record<string, string> = {
   'files.empty': 'No file reads, writes, or searches in this range',
   'files.noMatch': 'No files match the current filters',
   'files.locate': 'Reveal this operation in the Context Browser',
+  'files.hits': '{n} hits',
   'files.errs': '{n} failed',
   'files.form.image': 'Image', 'files.form.dir': 'Directory', 'files.form.text': 'File',
   'agents.title': 'Agent Network',
diff --git a/src/client/services.ts b/src/client/services.ts
index cbc784d..a8fbe2e 100644
--- a/src/client/services.ts
+++ b/src/client/services.ts
@@ -55,6 +55,15 @@ export interface ConversationNodeLike {
   call?: { name: string; argsRaw: string } | null
   isError?: boolean
   summary?: string | null
+  /**
+   * Nested Code-Mode call tree (dsh's recursive ToolCallBlock[]) on a tool
+   * result whose call ran sub-dispatches — a PTC `run_code` program. Consumed
+   * structurally only (fileActivity): every block is re-proved at runtime and
+   * malformed shapes drop out instead of throwing.
+   */
+  subCalls?: readonly unknown[]
+  /** The tool result's bounded presentation meta (a search's matched files), as the join delivers it. */
+  meta?: unknown
 }
 
 /**
diff --git a/tests/client/components/contextView.spec.ts b/tests/client/components/contextView.spec.ts
index 410ff6e..480d066 100644
--- a/tests/client/components/contextView.spec.ts
+++ b/tests/client/components/contextView.spec.ts
@@ -427,6 +427,55 @@ describe('ContextView — file activity card', () => {
     assert.ok(text(query(m.container, '.lc-br-elem-on')).includes('/src/a.ts'))
     await m.unmount()
   })
+
+  test('a nested PTC op reveals on its parent run_code result, not on its dispatch seq', async () => {
+    const ptcTimeline = timeline({
+      requests: [
+        { seq: 2, turn: 1, step: 1, time: T0 + 1000, system: 10, tools: 20, user: 10, inject: 0, assistant: 20, tool: 10, total: 70 },
+        { seq: 4, turn: 1, step: 2, time: T0 + 3000, system: 10, tools: 20, user: 10, inject: 0, assistant: 20, tool: 10, total: 70 },
+      ],
+      nodes: [
+        { seq: 2, cat: 'assistant', tokens: 20, text: 'r1', time: T0 + 1000 },
+        { seq: 3, cat: 'tool', tokens: 30, tool: 'run_code', time: T0 + 2000 },
+        { seq: 4, cat: 'assistant', tokens: 60, text: 'r2', time: T0 + 3000 },
+      ],
+    })
+    const ptcConv = [
+      {
+        kind: 'tool-result',
+        seq: 3,
+        call: { name: 'run_code', argsRaw: JSON.stringify({ code: 'await tools.edit(…)', description: 'Fix the failing test' }) },
+        subCalls: [
+          {
+            kind: 'tool-result',
+            seq: 2,
+            time: T0 + 1500,
+            call: { name: 'edit', argsRaw: JSON.stringify({ file_path: '/src/a.ts', old_string: 'a\nb', new_string: 'a' }) },
+            isError: false,
+            subCalls: [],
+          },
+        ],
+      },
+    ]
+    const View = makeView(new TestClientCtx())
+    const m = await mount(h(View, {
+      sessionId: 'sv-ptc-locate',
+      useProjection: projectionsFor(ptcTimeline),
+      useSession: (sel => sel({ nodes: ptcConv })) as UseSessionLike,
+    }))
+    const card = queryAll(m.container, '.lc-card').find(c => text(c).includes(DICT_EN['files.title']))
+    assert.ok(card !== undefined)
+    await click(query(card, '.lc-fa-row'))
+    // The op is attributed to the nested tool, and says why (its program).
+    assert.ok(text(card).includes('edit'))
+    assert.ok(text(card).includes('Fix the failing test'))
+    // The click lands on the parent run_code node (seq 3 → step 4's surface).
+    await click(query(card, '.lc-fa-op'))
+    const pick = query<HTMLSelectElement>(m.container, 'select.lc-br-pick')
+    assert.equal(pick.value, '4')
+    assert.ok(text(query(m.container, '.lc-br-elem-on')).includes('Fix the failing test'))
+    await m.unmount()
+  })
 })
 
 describe('ContextView — targeted content fetch and image loading', () => {
diff --git a/tests/client/components/fileCard.spec.ts b/tests/client/components/fileCard.spec.ts
index 441465c..508ac46 100644
--- a/tests/client/components/fileCard.spec.ts
+++ b/tests/client/components/fileCard.spec.ts
@@ -318,6 +318,33 @@ describe('FileCard — expansion and locate', () => {
     await m.unmount()
   })
 
+  test('a nested PTC op tells why (its program); a meta search op shows its hit count', async () => {
+    const m = await mount(h(FileCard, {
+      activity: richActivity({
+        entries: [
+          entry('/src/a.ts', {
+            reads: 2,
+            ops: [
+              fileOp(9, 'read', 'read', { parent: 30, program: 'Read failing test and its fixture' }),
+              fileOp(7, 'read', 'read'),
+            ],
+          }),
+          entry('/src/b.ts', { searches: 1, ops: [fileOp(10, 'search', 'grep', { detail: 'needle', hits: 3 })] }),
+        ],
+        totals: { read: { files: 1, ops: 2 }, write: { files: 0, ops: 0 }, search: { files: 1, ops: 1 }, image: { files: 0, ops: 0 }, added: 0, removed: 0 },
+      }),
+      scope: 'live',
+    }))
+    await click(rowByTitle(m.container, '/src/a.ts'))
+    assert.ok(text(query(m.container, '.lc-fa-ops')).includes('Read failing test and its fixture'))
+    await click(rowByTitle(m.container, '/src/a.ts')) // collapse
+    await click(rowByTitle(m.container, '/src/b.ts'))
+    const ops = text(query(m.container, '.lc-fa-ops'))
+    assert.ok(ops.includes('needle'))
+    assert.ok(ops.includes('3 hits'))
+    await m.unmount()
+  })
+
   test('without a locate hook the op lines render inert', async () => {
     const m = await mount(h(FileCard, { activity: richActivity(), scope: 'live' }))
     await click(queryAll(m.container, '.lc-fa-row')[0])
diff --git a/tests/client/fileActivity.spec.ts b/tests/client/fileActivity.spec.ts
index 06348d5..e5cd1f4 100644
--- a/tests/client/fileActivity.spec.ts
+++ b/tests/client/fileActivity.spec.ts
@@ -1,10 +1,11 @@
 // File activity derivation (src/client/fileActivity.ts) — the pure fold
 // behind the File Activity card: tool→kind classification, path extraction,
-// line-delta estimates, per-file aggregation, and the locate-target lookup.
+// line-delta estimates, per-file aggregation, nested Code-Mode (PTC) call
+// folding, search-meta attribution, and the locate-target lookup.
 
 import assert from 'node:assert/strict'
 import { describe, test } from 'vitest'
-import { activityOf, formOf, kindOfTool, linesOf, locateStepOf, pathOfArgs } from '../../src/client/fileActivity'
+import { activityOf, formOf, kindOfCall, kindOfTool, linesOf, locateStepOf, pathOfArgs } from '../../src/client/fileActivity'
 import type { FileActivity } from '../../src/client/fileActivity'
 import type { ConversationNodeLike } from '../../src/client/services'
 import type { RequestRecord, SurfaceNode } from '../../src/shared/types'
@@ -249,3 +250,272 @@ describe('locateStepOf', () => {
     assert.equal(locateStepOf([], 1, undefined), 'live')
   })
 })
+
+/** One settled nested sub-call block, as the conversation join delivers it. */
+function sub(seq: number, name: string, args: Record<string, unknown> | string, over: Record<string, unknown> = {}): Record<string, unknown> {
+  return {
+    kind: 'tool-result',
+    seq,
+    time: T0 + seq,
+    call: { name, argsRaw: typeof args === 'string' ? args : JSON.stringify(args) },
+    isError: false,
+    subCalls: [],
+    ...over,
+  }
+}
+
+describe('kindOfCall', () => {
+  test('str_replace_editor reads on view and writes otherwise; every other tool keeps its static kind', () => {
+    assert.equal(kindOfCall('str_replace_editor', { command: 'view' }), 'read')
+    assert.equal(kindOfCall('str_replace_editor', { command: 'create' }), 'write')
+    assert.equal(kindOfCall('str_replace_editor', { command: 'str_replace' }), 'write')
+    assert.equal(kindOfCall('str_replace_editor', { command: 'insert' }), 'write')
+    assert.equal(kindOfCall('str_replace_editor', { command: 'explode' }), 'write')
+    assert.equal(kindOfCall('str_replace_editor', null), 'write')
+    assert.equal(kindOfCall('read', null), 'read')
+    assert.equal(kindOfCall('bash', { command: 'ls' }), null)
+  })
+})
+
+describe('activityOf — str_replace_editor', () => {
+  test('view reads; create, str_replace, and insert write with their own line deltas', () => {
+    const a = run([
+      op(3, 'str_replace_editor', { command: 'view', path: '/a.py' }),
+      op(5, 'str_replace_editor', { command: 'create', path: '/b.py', file_text: 'one\ntwo\n' }),
+      op(7, 'str_replace_editor', { command: 'str_replace', path: '/b.py', old_str: 'one\ntwo', new_str: 'one' }),
+      op(9, 'str_replace_editor', { command: 'insert', path: '/c.py', insert_line: 1, new_str: 'x\ny' }),
+    ])
+    assert.deepEqual(a.entries.map(e => e.path), ['/c.py', '/b.py', '/a.py'])
+    const b = a.entries[1]
+    assert.equal(b.reads, 0)
+    assert.equal(b.writes, 2)
+    assert.equal(b.added, 3) // create 'one\ntwo\n' + str_replace 'one'
+    assert.equal(b.removed, 2) // str_replace 'one\ntwo'
+    assert.equal(a.entries[2].reads, 1)
+    assert.equal(a.entries[0].added, 2) // insert 'x\ny'
+    assert.deepEqual(a.totals.read, { files: 1, ops: 1 })
+    // Writes: /b.py (create + str_replace) and /c.py (insert).
+    assert.deepEqual(a.totals.write, { files: 2, ops: 3 })
+  })
+
+  test('a stringless call rows as a failed-looking but zero-delta write', () => {
+    const a = run([
+      op(3, 'str_replace_editor', { command: 'str_replace', path: '/a.py' }),
+      op(5, 'str_replace_editor', { path: '/b.py' }),
+    ])
+    assert.ok(a.entries.every(e => e.writes === 1 && e.added === 0 && e.removed === 0))
+  })
+})
+
+describe('activityOf — nested Code-Mode (PTC) calls', () => {
+  test('a run_code result folds its settled sub-dispatches into ops attributed to the nested tools', () => {
+    const a = run([
+      op(30, 'run_code', { code: 'await tools.read(…)', description: 'Read failing test and its fixture' }, {}, {
+        subCalls: [
+          sub(20, 'read', { file_path: '/src/a.ts' }),
+          sub(22, 'edit', { file_path: '/src/a.ts', old_string: 'x\ny', new_string: 'z' }),
+          sub(24, 'write', { file_path: '/src/b.ts', content: 'one\ntwo\n' }),
+          sub(26, 'grep', { pattern: 'needle', path: '/src' }),
+          sub(28, 'bash', { command: 'ls' }),
+          // A minimal settled block: no time, no error flag, no nested tree.
+          { kind: 'tool-result', seq: 27, call: { name: 'read', argsRaw: JSON.stringify({ file_path: '/src/a.ts' }) } },
+        ],
+      }),
+    ])
+    // /src/a.ts leads: its newest op is the minimal read at seq 27.
+    assert.deepEqual(a.entries.map(e => e.path), ['/src/a.ts', '/src', '/src/b.ts'])
+    const file = a.entries[0]
+    assert.equal(file.reads, 2)
+    assert.equal(file.writes, 1)
+    const read = file.ops.find(o => o.seq === 20)
+    assert.equal(read?.parent, 30)
+    assert.equal(read?.program, 'Read failing test and its fixture')
+    assert.equal(read?.time, T0 + 20)
+    // The minimal block carries no time and no error.
+    const minimal = file.ops.find(o => o.seq === 27)
+    assert.equal(minimal?.time, undefined)
+    assert.equal(minimal?.err, false)
+    assert.deepEqual(a.totals, {
+      read: { files: 1, ops: 2 },
+      write: { files: 2, ops: 2 },
+      search: { files: 1, ops: 1 },
+      image: { files: 0, ops: 0 },
+      added: 3,
+      removed: 2,
+    })
+  })
+
+  test('a program without a description rows its nested ops without one', () => {
+    const a = run([op(30, 'run_code', { code: 'x' }, {}, { subCalls: [sub(20, 'read', { file_path: '/a.ts' })] })])
+    assert.equal(a.entries[0].ops[0].program, undefined)
+  })
+
+  test('the sub-call error flag and the parent removal stamp ride the op', () => {
+    const a = run([op(30, 'run_code', { code: 'x' }, { gone: 40 }, {
+      subCalls: [
+        sub(20, 'read', { file_path: '/a.ts' }, { isError: true }),
+        sub(22, 'read', { file_path: '/b.ts' }),
+      ],
+    })])
+    assert.deepEqual(a.entries.map(e => e.path), ['/b.ts', '/a.ts'])
+    assert.equal(a.entries[1].ops[0].err, true)
+    // The parent's stamp locates the op; a failed program does not fail its
+    // earlier successful reads.
+    const ok = a.entries[0].ops[0]
+    assert.equal(ok.err, false)
+    assert.equal(ok.gone, 40)
+    const parentOnly = run([op(30, 'run_code', { code: 'x' }, { err: true }, { isError: true, subCalls: [sub(20, 'read', { file_path: '/c.ts' })] })])
+    assert.equal(parentOnly.entries[0].ops[0].err, false)
+  })
+
+  test('the parent seq gates nested ops at the before bound', () => {
+    const runCode = op(30, 'run_code', { code: 'x' }, {}, { subCalls: [sub(20, 'read', { file_path: '/a.ts' })] })
+    assert.equal(run([runCode], 30).entries.length, 0)
+    assert.equal(run([runCode], 31).entries.length, 1)
+  })
+
+  test('nested searches keep the pattern detail only when the path narrows', () => {
+    const a = run([op(30, 'run_code', null, {}, { subCalls: [
+      sub(20, 'grep', { pattern: 'needle', path: '/src' }),
+      sub(21, 'glob', { pattern: '**/*.md' }),
+    ] })])
+    assert.equal(a.entries[0].ops[0].detail, undefined) // the pattern IS the row path
+    assert.equal(a.entries[1].ops[0].detail, 'needle')
+  })
+
+  test('a nested image read keeps the image form and totals', () => {
+    const a = run([op(30, 'run_code', null, {}, { subCalls: [sub(20, 'read_image', { file_path: '/ui.png' })] })])
+    assert.equal(a.entries[0].form, 'image')
+    assert.deepEqual(a.totals.image, { files: 1, ops: 1 })
+  })
+
+  test('running and malformed sub-call blocks drop out instead of throwing', () => {
+    const a = run([op(30, 'run_code', null, {}, {
+      subCalls: [
+        'nope',
+        null,
+        42,
+        { call: { name: 'read', argsRaw: '{}' }, seq: 21 }, // no kind — still running
+        { kind: 'tool-result', seq: 22, call: null }, // unpaired result
+        { kind: 'tool-result', seq: 23, call: 'x' }, // call not an object
+        { kind: 'tool-result', seq: 24, call: { name: 'read' } }, // argsRaw missing
+        { kind: 'tool-result', seq: 25, call: { name: 9, argsRaw: '{}' } }, // name not a string
+        { kind: 'tool-result', call: { name: 'read', argsRaw: '{}' } }, // seq missing
+        { kind: 'tool-result', seq: Number.NaN, call: { name: 'read', argsRaw: '{}' } }, // non-finite seq
+        sub(26, 'read', 'not-json'), // unparseable args
+        sub(27, 'read', {}), // parsed but target-less
+        sub(28, 'read', { file_path: '/ok.ts' }),
+      ],
+    })])
+    assert.deepEqual(a.entries.map(e => e.path), ['/ok.ts'])
+    assert.equal(a.totals.read.ops, 1)
+  })
+
+  test('the depth cap and the cycle guard bound defensive trees', () => {
+    // A 10-deep chain books only the first eight levels.
+    let chain = sub(99, 'read', { file_path: '/deep.ts' })
+    for (let s = 98; s >= 90; s--) chain = { ...sub(s, 'read', { file_path: '/deep.ts' }), subCalls: [chain] }
+    const deep = run([op(100, 'run_code', null, {}, { subCalls: [chain] })])
+    assert.equal(deep.entries[0].reads, 8)
+
+    // A cyclic join terminates and books each block once.
+    const x = sub(80, 'read', { file_path: '/cyc.ts' })
+    const y = sub(81, 'read', { file_path: '/cyc.ts' })
+    y.subCalls = [x]
+    x.subCalls = [y]
+    const cyclic = run([op(82, 'run_code', null, {}, { subCalls: [x] })])
+    assert.equal(cyclic.entries[0].reads, 2)
+  })
+
+  test('a join without subCalls — aged out, or an older client — folds nothing extra', () => {
+    const a = run([op(30, 'run_code', { code: 'x' })])
+    assert.deepEqual(a.entries, [])
+  })
+})
+
+describe('activityOf — search meta attribution', () => {
+  test('a complete grep meta rows per matched file with hit counts and the pattern detail', () => {
+    const a = run([
+      op(10, 'grep', { pattern: 'needle', path: '/src' }, {}, {
+        meta: { shape: 'matches', truncated: false, total: 3, files: [
+          { path: '/src/a.ts', matches: [{ lineNumber: 1, line: 'needle' }, { lineNumber: 2, line: 'needle!' }] },
+          { path: '/src/b.ts', matches: [{ lineNumber: 5, line: 'needle' }] },
+        ] },
+      }),
+      // A capped meta names a partial file set: the call falls back to its own target.
+      op(12, 'grep', { pattern: 'broad' }, {}, {
+        meta: { shape: 'matches', truncated: true, total: 500, files: [{ path: '/src/a.ts', matches: [{ lineNumber: 1, line: 'x' }] }] },
+      }),
+      // An archived, timeless search still stamps its meta rows with the parent's removal.
+      op(14, 'grep', { pattern: 'old' }, { gone: 20, time: undefined }, {
+        meta: { shape: 'paths', truncated: false, total: 1, paths: ['/old.ts'] },
+      }),
+    ])
+    assert.deepEqual(a.entries.map(e => e.path), ['/old.ts', 'broad', '/src/a.ts', '/src/b.ts'])
+    const first = a.entries[2]
+    assert.equal(first.searches, 1)
+    assert.equal(first.ops[0].hits, 2)
+    assert.equal(first.ops[0].detail, 'needle')
+    assert.equal(a.entries[3].ops[0].hits, 1)
+    // The archived, timeless meta row carries the node's stamp (and no time).
+    assert.equal(a.entries[0].ops[0].gone, 20)
+    assert.equal(a.entries[0].ops[0].time, undefined)
+    assert.deepEqual(a.totals.search, { files: 4, ops: 4 })
+  })
+
+  test('an include filter joins the detail; glob metas row without hit counts', () => {
+    const a = run([
+      op(10, 'grep', { pattern: 'needle', include: '*.ts' }, {}, {
+        meta: { shape: 'matches', truncated: false, total: 1, files: [{ path: '/a.ts', matches: [{ lineNumber: 1, line: 'x' }] }] },
+      }),
+      op(12, 'glob', { pattern: '**/*.md' }, {}, {
+        meta: { shape: 'paths', truncated: false, total: 2, paths: ['/r.md', '/o.md'] },
+      }),
+    ])
+    assert.deepEqual(a.entries.map(e => e.path), ['/r.md', '/o.md', '/a.ts'])
+    assert.equal(a.entries[2].ops[0].detail, 'needle (*.ts)')
+    assert.equal(a.entries[1].ops[0].hits, undefined) // a listed path matched no lines
+    assert.equal(a.entries[1].ops[0].detail, '**/*.md')
+  })
+
+  test('malformed or empty metas fall back to the pattern row', () => {
+    const metas: unknown[] = [
+      'junk',
+      42,
+      { truncated: false, paths: ['/a.ts'] }, // shape missing
+      { shape: 'other', truncated: false, paths: ['/a.ts'] }, // unknown shape
+      { shape: 'matches', truncated: false }, // files missing
+      { shape: 'matches', truncated: false, files: 'x' }, // files not a list
+      { shape: 'matches', truncated: false, files: [] }, // nothing retained
+      { shape: 'matches', truncated: false, files: [null, 7, { path: '' }, { path: '/a.ts' }, { path: '/a.ts', matches: 'x' }] }, // all groups malformed
+      { shape: 'paths', truncated: false }, // paths missing
+      { shape: 'paths', truncated: false, paths: [] }, // nothing listed
+    ]
+    for (const [i, meta] of metas.entries()) {
+      const a = run([op(10, 'grep', { pattern: 'needle', path: '/src' }, {}, { meta })])
+      assert.deepEqual(a.entries.map(e => e.path), ['/src'], `meta case ${i} must fall back`)
+    }
+  })
+
+  test('one valid path among malformed siblings still attributes', () => {
+    const a = run([op(10, 'grep', { pattern: 'needle', path: '/src' }, {}, {
+      meta: { shape: 'paths', truncated: false, total: 2, paths: ['/a.ts', ''] },
+    })])
+    assert.deepEqual(a.entries.map(e => e.path), ['/a.ts'])
+  })
+
+  test('a truncated flag is required — a missing one falls back', () => {
+    const a = run([op(10, 'grep', { pattern: 'n', path: '/src' }, {}, {
+      meta: { shape: 'paths', paths: ['/a.ts'] },
+    })])
+    assert.deepEqual(a.entries.map(e => e.path), ['/src'])
+  })
+
+  test('meta attribution survives an aged-out call head — no args, no pattern detail', () => {
+    const a = run([op(10, 'grep', null, {}, {
+      meta: { shape: 'paths', truncated: false, total: 1, paths: ['/only.md'] },
+    })])
+    assert.deepEqual(a.entries.map(e => e.path), ['/only.md'])
+    assert.equal(a.entries[0].ops[0].detail, undefined)
+  })
+})