diff --git a/webviews/src/agent-session/acpmux/conversation/turns.ts b/webviews/src/agent-session/acpmux/conversation/turns.ts
index addfc7702427..4085f5dd4434 100644
--- a/webviews/src/agent-session/acpmux/conversation/turns.ts
+++ b/webviews/src/agent-session/acpmux/conversation/turns.ts
@@ -58,9 +58,8 @@ export function workedLabel(t: Translate, row: AcpmuxRow): string {
   return row.status === "cancelled" ? t("turn.stopped", { time }) : t("turn.worked", { time });
 }
 
-const isEdit = (row: AcpmuxRow) =>
-  row.kind === "activity" &&
-  (row.items ?? []).some((item) => item.tool?.kind === "edit" || item.tool?.kind === "fileChange");
+const isEditTool = (tool: { kind?: string } | undefined) => tool?.kind === "edit" || tool?.kind === "fileChange";
+const isEdit = (row: AcpmuxRow) => row.kind === "activity" && (row.items ?? []).some((item) => isEditTool(item.tool));
 
 /// The rows to draw. `expanded` holds the ids of open disclosures; `working` says the last
 /// turn is still running (the snapshot's `isWorking`); `now` dates the turns (timestamps.ts);
@@ -240,6 +239,24 @@ function shapedTurn(
 }
 
 const isAnswer = (row: AcpmuxRow) => row.kind === "assistant";
+
+/// A tool call after a turn's last text: the turn ended on work, so that text was interim.
+/// Edits join the turn's card and render calls draw as their own cards, so neither counts; a
+/// step that edited and then ran something does.
+const isWork = (row: AcpmuxRow) =>
+  row.kind === "activity" &&
+  (row.items ?? []).some((item) => item.tool && !isEditTool(item.tool) && !renderCall(item.tool));
+
+/// Where a finished turn's answer is in `rows`: the last text, unless the turn went on to work
+/// after it (-1: no answer, so all of it folds, as the Codex and Claude desktop apps fold it).
+function answerAt(rows: readonly AcpmuxRow[]): number {
+  for (let at = rows.length - 1; at >= 0; at -= 1) {
+    const row = rows[at]!;
+    if (isAnswer(row)) return at;
+    if (isWork(row)) return -1;
+  }
+  return -1;
+}
 const isUnsent = (row: AcpmuxRow) => Boolean(row.pending || row.failed);
 
 function shapeTurn(
@@ -260,12 +277,7 @@ function shapeTurn(
     return live ? liveTurn(user, turn, clockOffset) : last ? turn : settledWithoutSummary(user, turn, expanded);
   const summary = turn[end]!;
   const body = turn.slice(0, end);
-  let final = -1;
-  for (let at = body.length - 1; at >= 0; at -= 1)
-    if (body[at]!.kind === "assistant") {
-      final = at;
-      break;
-    }
+  const final = answerAt(body);
   const answer = final >= 0 ? body[final] : undefined;
   // Work before the answer folds away (all of it, when the turn ended without one); edits
   // also close the turn as their card. Subagent groups and the todo list stay out, under the
@@ -371,12 +383,7 @@ const staysOut = (row: AcpmuxRow) =>
 /// reloaded turn without timing, and its answer and edits draw after it.
 function settledWithoutSummary(user: AcpmuxRow, turn: AcpmuxRow[], expanded: ReadonlySet<string>): AcpmuxRow[] {
   const rows = turn.filter((row) => row.kind !== "typing");
-  let final = -1;
-  for (let at = rows.length - 1; at >= 0; at -= 1)
-    if (rows[at]!.kind === "assistant") {
-      final = at;
-      break;
-    }
+  const final = answerAt(rows);
   const before = final >= 0 ? rows.slice(0, final) : rows;
   const work = before.filter((row) => !staysOut(row));
   if (work.length === 0) return rows;
diff --git a/webviews/test/transcript-worked-fold.test.ts b/webviews/test/transcript-worked-fold.test.ts
new file mode 100644
index 000000000000..84feaf2a82f4
--- /dev/null
+++ b/webviews/test/transcript-worked-fold.test.ts
@@ -0,0 +1,85 @@
+// A finished turn folds everything between the prompt and its answer under "Worked for", as the
+// Codex and Claude desktop apps do: the answer is the text the turn ended on. A turn that ended on
+// work instead (a tool after its last text, or stopped mid-tool) has no answer, so its interim
+// text folds with the rest rather than standing open as if it were the answer.
+import { expect, test } from "bun:test";
+import type { AcpmuxRow } from "../src/agent-session/acpmux/model";
+import { turnView } from "../src/agent-session/acpmux/conversation/turns";
+
+let at = 0;
+const row = (id: string, kind: string, extra: Partial<AcpmuxRow> = {}): AcpmuxRow => ({
+  id,
+  kind,
+  version: 1,
+  at: (at += 1_000),
+  ...extra,
+});
+const tool = (id: string, kind = "read") =>
+  row(id, "activity", { items: [{ kind: "tool", text: "", tool: { id, title: id, kind, status: "completed" } }] });
+const text = (id: string) => row(id, "assistant", { text: id });
+const summary = (status = "completed") => row("end", "turnSummary", { status, durationMs: 9_000 });
+// The turn's rows as drawn, without the day separators above them.
+const drawn = (rows: AcpmuxRow[], expanded: ReadonlySet<string> = new Set()) =>
+  turnView(rows, expanded)
+    .filter((shaped) => shaped.kind !== "date")
+    .map((shaped) => `${shaped.kind}:${shaped.id}`);
+
+test("the answer stays open below the fold of the work before it", () => {
+  const rows = [row("u", "user"), text("interim"), tool("read"), text("answer"), summary()];
+  expect(drawn(rows)).toEqual(["user:u", "worked:worked-u", "assistant:answer", "turnSummary:end"]);
+});
+
+test("a turn that ended on a tool folds its interim text with the rest", () => {
+  const rows = [row("u", "user"), text("interim-1"), tool("read"), text("interim-2"), tool("grep"), summary()];
+  expect(drawn(rows)).toEqual(["user:u", "worked:worked-u", "turnSummary:end"]);
+});
+
+test("a turn stopped mid-tool folds its work under the stop line", () => {
+  const rows = [row("u", "user"), text("interim"), tool("build"), summary("cancelled")];
+  expect(drawn(rows)).toEqual(["user:u", "worked:worked-u", "turnSummary:end"]);
+});
+
+test("a turn that edited and then ran a tool in one step folds its interim text", () => {
+  const step = row("step", "activity", {
+    items: [
+      { kind: "tool", text: "", tool: { id: "patch", title: "patch", kind: "edit", status: "completed" } },
+      { kind: "tool", text: "", tool: { id: "test", title: "test", kind: "execute", status: "completed" } },
+    ],
+  });
+  const rows = [row("u", "user"), text("interim"), step, summary("cancelled")];
+  const shaped = drawn(rows);
+  expect(shaped.slice(0, 2)).toEqual(["user:u", "worked:worked-u"]);
+  expect(shaped).not.toContain("assistant:interim");
+});
+
+test("an edit after the answer still joins the turn's edit card, and the answer stays open", () => {
+  const rows = [row("u", "user"), tool("read"), text("answer"), tool("patch", "edit"), summary()];
+  const shaped = drawn(rows);
+  expect(shaped.slice(0, 3)).toEqual(["user:u", "worked:worked-u", "assistant:answer"]);
+  expect(shaped.at(-1)).toBe("turnSummary:end");
+  expect(shaped.filter((entry) => entry === "activity:patch")).toHaveLength(1);
+});
+
+test("an earlier turn without a summary that ended on a tool folds its interim text too", () => {
+  const rows = [
+    row("u1", "user"),
+    text("interim"),
+    tool("read"),
+    row("u2", "user"),
+    text("answer-2"),
+    row("end-2", "turnSummary", { status: "completed", durationMs: 1_000 }),
+  ];
+  const shaped = drawn(rows);
+  expect(shaped.slice(0, shaped.indexOf("user:u2"))).toEqual(["user:u1", "worked:worked-u1"]);
+});
+
+test("expanding the fold of a turn that ended on a tool shows the interim text and tools in order", () => {
+  const rows = [row("u", "user"), text("interim"), tool("read"), summary()];
+  expect(drawn(rows, new Set(["worked-u"]))).toEqual([
+    "user:u",
+    "worked:worked-u",
+    "assistant:interim",
+    "activity:read",
+    "turnSummary:end",
+  ]);
+});