fix(server): keep a gotgenes foreground answer on replay

A foreground @gotgenes/pi-subagents child finds its session file only through the live runtime marker, which history does not keep. Without a file, emit the spawn result text as the child's assistant message.
fix(server): settle child compactions and keep sub-agent cards stable
2026-10-30 21:23:04 +00:00 · 2026-10-30 12:01:23 +01:00 · 2026-10-30 11:47:33 +01:00 · 2026-10-30 09:49:51 +01:00 · 2026-10-30 08:35:04 +01:00
47 changed files with 578 additions and 1118 deletions
@@ -64,7 +64,7 @@ function resolveShouldFill(
 ): boolean {
  if (!fillAvailableHeight) return false;
  const t = detail?.type;
-  return t === "shell" || t === "edit" || t === "write" || t === "read" || t === "sub_agent";
+  return t === "shell" || t === "edit" || t === "write" || t === "read";
 }
 function useDetailStyles(
@@ -186,184 +186,6 @@ function ShellDetailSection({ command, output, ds }: ShellDetailProps) {
  );
 }
 function resolveSubAgentFallbackHeader(
  subAgentType: string | null | undefined,
  description: string | null | undefined,
  fallbackText: string,
 ): string {
  if (subAgentType && description) {
    return `${subAgentType}: ${description}`;
  }
  return subAgentType ?? description ?? fallbackText;
 }
 interface SubAgentDetailProps {
  log: string;
  childSessionId: string | null | undefined;
  subAgentType: string | null | undefined;
  description: string | null | undefined;
  ds: DetailStyles;
 }
 interface SubAgentActivityRow {
  index: number;
  toolName: string;
  summary?: string;
 }
 interface ParsedSubAgentLog {
  actions: SubAgentActivityRow[];
  remainingLog: string;
 }
 function parseBracketedSubAgentLine(line: string, index: number): SubAgentActivityRow | null {
  const match = line.match(/^\[([^\]]+)\](?:\s+(.*))?$/);
  if (!match) {
    return null;
  }
  const toolName = match[1]?.trim();
  if (!toolName) {
    return null;
  }
  const summary = match[2]?.trim();
  return {
    index,
    toolName,
    ...(summary ? { summary } : {}),
  };
 }
 function parseSubAgentLog(log: string): ParsedSubAgentLog {
  const actions: SubAgentActivityRow[] = [];
  const remainingLines: string[] = [];
  for (const line of log.replace(/^\n+/, "").split("\n")) {
    const normalizedLine = line.trim();
    if (!normalizedLine) {
      continue;
    }
    const parsedAction = parseBracketedSubAgentLine(normalizedLine, actions.length + 1);
    if (parsedAction) {
      actions.push(parsedAction);
    } else {
      remainingLines.push(line);
    }
  }
  return {
    actions,
    remainingLog: remainingLines.join("\n").replace(/^\n+/, ""),
  };
 }
 function SubAgentActionRow({ action }: { action: SubAgentActivityRow }) {
  return (
    <View style={styles.subAgentActionRow}>
      <Text selectable style={styles.subAgentActionTool}>
        {formatSubAgentToolName(action.toolName)}
      </Text>
      {action.summary ? (
        <Text selectable style={styles.subAgentActionSummary}>
          {action.summary}
        </Text>
      ) : null}
    </View>
  );
 }
 function formatSubAgentToolName(toolName: string): string {
  const trimmed = toolName.trim();
  if (!trimmed) {
    return toolName;
  }
  return trimmed
    .replace(/[._-]+/g, " ")
    .split(" ")
    .filter((segment) => segment.length > 0)
    .map((segment) => `${segment[0]?.toUpperCase() ?? ""}${segment.slice(1)}`)
    .join(" ");
 }
 function SubAgentLogText({
  activityLog,
  fallbackHeader,
  hasActions,
 }: {
  activityLog: string;
  fallbackHeader: string;
  hasActions: boolean;
 }) {
  if (activityLog.length > 0) {
    return (
      <Text selectable style={styles.scrollText}>
        {activityLog}
      </Text>
    );
  }
  if (!hasActions) {
    return (
      <Text selectable style={styles.scrollText}>
        {fallbackHeader}
      </Text>
    );
  }
  return null;
 }
 function SubAgentDetailSection({
  log,
  childSessionId,
  subAgentType,
  description,
  ds,
 }: SubAgentDetailProps) {
  const { t } = useTranslation();
  const { actions, remainingLog } = useMemo(() => parseSubAgentLog(log), [log]);
  const fallbackHeader = resolveSubAgentFallbackHeader(
    subAgentType,
    description,
    t("toolCallDetails.subAgentActivity"),
  );
  const hasActions = actions.length > 0;
  return (
    <View style={ds.sectionFillStyle}>
      <View style={ds.codeBlockFillStyle}>
        <ScrollView
          style={ds.codeVerticalScrollStyle}
          contentContainerStyle={styles.codeVerticalContent}
          nestedScrollEnabled
          showsVerticalScrollIndicator
        >
          <ScrollView
            horizontal
            nestedScrollEnabled
            showsHorizontalScrollIndicator
            contentContainerStyle={styles.codeHorizontalContent}
          >
            <View style={styles.codeLine} dataSet={CODE_SURFACE_DATASET}>
              {childSessionId ? (
                <Text selectable style={styles.subAgentSessionText}>
                  session {childSessionId}
                </Text>
              ) : null}
              {hasActions ? (
                <View style={styles.subAgentActions}>
                  {actions.map((action) => (
                    <SubAgentActionRow key={action.index} action={action} />
                  ))}
                </View>
              ) : null}
              <SubAgentLogText
                activityLog={remainingLog}
                fallbackHeader={fallbackHeader}
                hasActions={hasActions}
              />
            </View>
          </ScrollView>
        </ScrollView>
      </View>
    </View>
  );
 }
 interface EditDetailProps {
  diffLines: DiffLine[] | undefined;
  ds: DetailStyles;
@@ -636,19 +458,7 @@ function buildDetailSections(
      <ShellDetailSection key="shell" command={detail.command} output={detail.output} ds={ds} />,
    ];
  }
-  if (detail.type === "worktree_setup") return [];
+  if (detail.type === "worktree_setup" || detail.type === "sub_agent") return [];
  if (detail.type === "sub_agent") {
    return [
      <SubAgentDetailSection
        key="sub-agent"
        log={detail.log}
        childSessionId={detail.childSessionId}
        subAgentType={detail.subAgentType}
        description={detail.description}
        ds={ds}
      />,
    ];
  }
  if (detail.type === "edit") {
    return [<EditDetailSection key="edit" diffLines={diffLines} ds={ds} />];
  }
@@ -900,34 +710,6 @@ const styles = StyleSheet.create((theme) => {
    shellPrompt: {
      color: theme.colors.foregroundMuted,
    },
    subAgentSessionText: {
      fontFamily: theme.fontFamily.mono,
      fontSize: theme.fontSize.code,
      color: theme.colors.foregroundMuted,
      lineHeight: 18,
      marginBottom: theme.spacing[2],
    },
    subAgentActions: {
      gap: theme.spacing[1],
      marginBottom: theme.spacing[2],
    },
    subAgentActionRow: {
      flexDirection: "row",
      alignItems: "center",
      gap: theme.spacing[2],
    },
    subAgentActionTool: {
      fontFamily: theme.fontFamily.mono,
      fontSize: theme.fontSize.code,
      color: theme.colors.foregroundMuted,
      lineHeight: 18,
    },
    subAgentActionSummary: {
      fontFamily: theme.fontFamily.mono,
      fontSize: theme.fontSize.code,
      color: theme.colors.foreground,
      lineHeight: 18,
    },
    jsonScroll: {
      borderWidth: theme.borderWidth[1],
      borderColor: theme.colors.border,
@@ -832,7 +832,6 @@ describe("translation resources", () => {
    expect(en.common.placeholders.search).toBe("Search...");
    expect(en.common.empty.noResults).toBe("No results found");
    expect(en.common.empty.noOptionsMatchSearch).toBe("No options match your search.");
    expect(en.toolCallDetails.subAgentActivity).toBe("Sub-agent activity");
    expect(en.panels.file.failedToLoadPreview).toBe("Failed to load file preview");
  });
@@ -2013,7 +2013,6 @@ export const ar: TranslationResources = {
  toolCallDetails: {
    error: "خطأ",
    empty: "لا توجد تفاصيل إضافية متاحة",
    subAgentActivity: "نشاط الوكيل الفرعي",
    input: "مدخل",
    output: "الإخراج",
  },
@@ -2038,7 +2038,6 @@ export const en = {
  toolCallDetails: {
    error: "Error",
    empty: "No additional details available",
    subAgentActivity: "Sub-agent activity",
    input: "Input",
    output: "Output",
  },
@@ -2061,7 +2061,6 @@ export const es: TranslationResources = {
  toolCallDetails: {
    error: "Error",
    empty: "No hay detalles adicionales disponibles",
    subAgentActivity: "Actividad de subagente",
    input: "Aporte",
    output: "Producción",
  },
@@ -2060,7 +2060,6 @@ export const fr: TranslationResources = {
  toolCallDetails: {
    error: "Erreur",
    empty: "Aucun détail supplémentaire disponible",
    subAgentActivity: "Activité du sous-agent",
    input: "Entrée",
    output: "Sortie",
  },
@@ -2033,7 +2033,6 @@ export const ja: TranslationResources = {
  toolCallDetails: {
    error: "エラー",
    empty: "追加の詳細はありません",
    subAgentActivity: "サブエージェントアクティビティ",
    input: "入力",
    output: "出力",
  },
@@ -2023,7 +2023,6 @@ export const ko: TranslationResources = {
  toolCallDetails: {
    error: "오류",
    empty: "추가 세부 정보가 없습니다",
    subAgentActivity: "서브에이전트 활동",
    input: "입력",
    output: "출력",
  },
@@ -2046,7 +2046,6 @@ export const ptBR: TranslationResources = {
  toolCallDetails: {
    error: "Erro",
    empty: "Nenhum detalhe adicional disponível",
    subAgentActivity: "Atividade do subagente",
    input: "Entrada",
    output: "Saída",
  },
@@ -2046,7 +2046,6 @@ export const ru: TranslationResources = {
  toolCallDetails: {
    error: "Ошибка",
    empty: "Дополнительные сведения отсутствуют",
    subAgentActivity: "Активность субагента",
    input: "Входные данные",
    output: "Выходные данные",
  },
@@ -1991,7 +1991,6 @@ export const zhCN: TranslationResources = {
  toolCallDetails: {
    error: "错误",
    empty: "没有可用的更多详情",
    subAgentActivity: "Sub-agent 活动",
    input: "输入",
    output: "输出",
  },
@@ -40,12 +40,6 @@ function hasMeaningfulFetchDetail(detail: Extract<ToolCallDetail, { type: "fetch
  return Boolean(detail.url || detail.result || detail.codeText);
 }
 function hasMeaningfulSubAgentDetail(
  detail: Extract<ToolCallDetail, { type: "sub_agent" }>,
 ): boolean {
  return Boolean(detail.subAgentType || detail.description || detail.log);
 }
 function hasMeaningfulPlainTextDetail(
  detail: Extract<ToolCallDetail, { type: "plain_text" }>,
 ): boolean {
@@ -75,9 +69,9 @@ export function hasMeaningfulToolCallDetail(detail: ToolCallDetail | undefined):
    case "fetch":
      return hasMeaningfulFetchDetail(detail);
    case "worktree_setup":
-      return false;
+    // A sub-agent card is a launch marker; the child's activity lives in the sub-agent panel.
    case "sub_agent":
-      return hasMeaningfulSubAgentDetail(detail);
+      return false;
    case "plain_text":
      return hasMeaningfulPlainTextDetail(detail);
    case "plan":
@@ -92,7 +86,7 @@ export function isPendingToolCallDetail(params: {
  status: "executing" | "running" | "completed" | "failed" | "canceled";
  error: unknown;
 }): boolean {
-  if (params.detail?.type === "worktree_setup") return false;
+  if (params.detail?.type === "worktree_setup" || params.detail?.type === "sub_agent") return false;
  const isRunning = params.status === "running" || params.status === "executing";
  return isRunning && params.error == null && !hasMeaningfulToolCallDetail(params.detail);
 }
@@ -288,7 +288,7 @@ export type ToolCallDetail =
      subAgentType?: string;
      description?: string;
      childSessionId?: string;
-      log: string;
+      log?: string;
      actions?: Array<{
        index: number;
        toolName: string;
@@ -638,7 +638,9 @@ const ToolCallDetailPayloadSchema: z.ZodType<ToolCallDetail, unknown> = z.discri
      subAgentType: z.string().optional(),
      description: z.string().optional(),
      childSessionId: z.string().optional(),
-      log: z.string(),
+      // COMPAT(subagent-log): added in v0.14.1, remove after 2027-04-30. A sub-agent card is a
      // launch marker; apps before v0.14.1 required `log`, so daemons still send it empty.
      log: z.string().optional(),
      // Compat cruft for clients <= 0.1.65-beta.3 that required this field. Producers still
      // emit `[]`; nothing reads it. Drop the field (and the `[]` emissions) once those
      // clients are no longer in the field.
@@ -200,8 +200,8 @@ describe("wire schema compatibility", () => {
    });
  });
-  test("sub_agent tool-call payload still parses against the v0.1.65-beta.3 schema", () => {
+  test("a sub-agent launch marker still parses against the v0.1.65-beta.3 schema", () => {
-    const parsed = LegacySubAgentToolCallSchema.parse({
+    const card = {
      type: "tool_call",
      callId: "call-sub-agent-1",
      name: "Task",
@@ -212,12 +212,26 @@ describe("wire schema compatibility", () => {
        subAgentType: "Explore",
        description: "Inspect repository structure",
        childSessionId: "child-session-1",
-        log: "[Read] README.md",
+        log: "",
        actions: [],
      },
-    });
+    } as const;
-    expect(parsed.detail.actions).toEqual([]);
+    const parsed = LegacySubAgentToolCallSchema.parse(JSON.parse(JSON.stringify(card)));
    expect(parsed.detail).toMatchObject({ log: "", actions: [] });
    const { log: _log, ...withoutLog } = card.detail;
    expect(LegacySubAgentToolCallSchema.safeParse({ ...card, detail: withoutLog }).success).toBe(
      false,
    );
    expect(AgentTimelineItemPayloadSchema.parse({ ...card, detail: withoutLog })).toMatchObject({
      detail: { type: "sub_agent", description: "Inspect repository structure" },
    });
    expect(
      AgentTimelineItemPayloadSchema.parse({
        ...card,
        detail: { ...card.detail, log: "[Read] README.md" },
      }),
    ).toMatchObject({ detail: { log: "[Read] README.md" } });
  });
  test("old clients parse agent snapshots with rewind capabilities", () => {
@@ -247,7 +247,7 @@ second line'`,
    ]);
  });
-  it("keeps nested sub-agent logs beside the sub-agent that produced them", () => {
+  it("lists each sub-agent as its launch marker", () => {
    const timeline: AgentTimelineItem[] = [
      { type: "assistant_message", text: "Before first child." },
      toolCallItem({
@@ -257,7 +257,7 @@ second line'`,
          type: "sub_agent",
          subAgentType: "Child one",
          description: "First investigation",
-          log: "[Assistant] First child result.",
+          log: "",
        },
      }),
      { type: "assistant_message", text: "Between children." },
@@ -268,7 +268,7 @@ second line'`,
          type: "sub_agent",
          subAgentType: "Child two",
          description: "Second investigation",
-          log: "[Assistant] Second child result.",
+          log: "",
        },
      }),
      { type: "assistant_message", text: "After second child." },
@@ -279,10 +279,8 @@ second line'`,
    expect(result.split("\n")).toEqual([
      "[Assistant] Before first child.",
      "[Child one] First investigation",
      "[Assistant] First child result.",
      "[Assistant] Between children.",
      "[Child two] Second investigation",
      "[Assistant] Second child result.",
      "[Assistant] After second child.",
    ]);
  });
@@ -164,9 +164,6 @@ function curateProjectedActivityEntries(
          break;
        }
        entries.push(formatToolCallEntry(item, options));
        if (item.detail.type === "sub_agent" && item.detail.log.trim()) {
          entries.push(activityEntry(item.detail.log.trim()));
        }
        break;
      }
      case "todo":
@@ -313,7 +313,10 @@ export type ToolCallDetail =
      subAgentType?: string;
      description?: string;
      childSessionId?: string;
-      log: string;
+      // COMPAT(subagent-log): added in v0.14.1, remove after 2027-04-30. Apps before v0.14.1
      // require `log`; every producer sends it empty and carries the same tag. Optional here because
      // protocol timeline items, where `log` is optional, flow into this type.
      log?: string;
      actions?: Array<{
        index: number;
        toolName: string;
@@ -466,13 +466,13 @@ describe("background Claude subagents", () => {
        type: "sub_agent",
        subAgentType: "general-purpose",
        description: "Count files here",
-        log: "[Bash] ls -1",
+        log: "",
      },
    });
  });
  test.each(["before", "after"])(
-    "keeps one logged Task card when child tools start %s the parent finishes",
+    "keeps one Task card when child tools start %s the parent finishes",
    async (timing) => {
      // A child can stream across the main session's turn boundary. Claude opens the next
      // main-session turn with system/init; bare child frames do not open a turn.
@@ -605,7 +605,7 @@ describe("background Claude subagents", () => {
          type: "sub_agent",
          subAgentType: "general-purpose",
          description: "Count files here",
-          log: "[Bash] ls -1",
+          log: "",
        },
      });
    },
@@ -273,7 +273,7 @@ describe("ClaudeAgentSession sub-agent sidechain updates", () => {
    queryFactory.mockReset();
  });
-  test("accumulates lightweight sub_agent detail and preserves callId lifecycle collapse", async () => {
+  test("labels the Task card from its input and preserves callId lifecycle collapse", async () => {
    const session = await new ClaudeAgentClient({
      logger,
      queryFactory,
@@ -307,9 +307,7 @@ describe("ClaudeAgentSession sub-agent sidechain updates", () => {
    expect(latest.detail.subAgentType).toBe("Explore");
    expect(latest.detail.description).toBe("Inspect repository structure");
-    expect(latest.detail.log).toContain("[Read] README.md");
+    expect(latest.detail.log).toBe("");
    expect(latest.detail.log).toContain("[Edit] src/index.ts");
    expect(latest.detail.log).not.toContain("VERY_LARGE_OLD_STRING");
    const rows: AgentTimelineRow[] = timelineToolCalls.map((item, index) => ({
      seq: index + 1,
@@ -396,10 +394,7 @@ describe("ClaudeAgentSession sub-agent sidechain updates", () => {
      .map((event) => event.item)
      .at(-1);
-    expect(latestSubAgentUpdate?.detail).toMatchObject({
+    expect(latestSubAgentUpdate?.detail).toMatchObject({ type: "sub_agent", log: "" });
      type: "sub_agent",
      log: expect.stringContaining("[Read] README.md"),
    });
  });
  test("routes a resumed SendMessage sidechain to the original child without a second Task card", async () => {
@@ -553,7 +548,7 @@ describe("ClaudeAgentSession sub-agent sidechain updates", () => {
    ).toMatchObject({ type: "upsert", id: "task-tail-1", status: "failed" });
  });
-  test("tails sub-agent actions instead of dropping latest entries at cap", async () => {
+  test("keeps the Task card the same size while the child runs", async () => {
    queryFactory.mockImplementation(() => buildQueryMock(buildTailScenarioEvents(205)));
    const session = await new ClaudeAgentClient({
@@ -568,24 +563,27 @@ describe("ClaudeAgentSession sub-agent sidechain updates", () => {
    const events = await collectUntilTerminal(streamSession(session, "delegate work"));
    await session.close();
-    const timelineToolCalls = events
+    const runningCards = events
-      .filter(
+      .flatMap((event) =>
-        (event): event is Extract<AgentStreamEvent, { type: "timeline" }> =>
+        event.type === "timeline" &&
-          event.type === "timeline" && event.item.type === "tool_call",
+        event.item.type === "tool_call" &&
        event.item.callId === "task-tail-1" &&
        event.item.status === "running" &&
        event.item.detail.type === "sub_agent"
          ? [event.item]
          : [],
      )
-      .map((event) => event.item)
+      .map((item) => JSON.stringify(item));
-      .filter((item) => item.callId === "task-tail-1");
+    expect(runningCards).toHaveLength(1);
    const subAgentUpdates = timelineToolCalls.filter((item) => item.detail.type === "sub_agent");
    const latest = subAgentUpdates[subAgentUpdates.length - 1];
    expect(latest).toBeDefined();
    if (!latest || latest.detail.type !== "sub_agent") {
      throw new Error("expected sub_agent detail");
    }
-    expect(latest.detail.log).not.toContain("[Read] file-1.md");
+    const childToolCalls = events.filter(
-    expect(latest.detail.log).not.toContain("[Read] file-5.md");
+      (event) =>
-    expect(latest.detail.log).toContain("[Read] file-6.md");
+        event.type === "provider_subagent" &&
-    expect(latest.detail.log).toContain("[Read] file-205.md");
+        event.event.type === "timeline" &&
        event.event.id === "task-tail-1" &&
        event.event.item.type === "tool_call",
    );
    expect(childToolCalls).toHaveLength(205);
  });
  test("keeps a long main-thread tool call out of the subagents track", async () => {
@@ -4667,7 +4667,7 @@ class ClaudeAgentSession implements AgentSession {
  /**
   * The Task card in the parent transcript, built from the declaration.
   *
-   * The sidechain tracker also emits this card, enriched with the child's action log, and the two
+   * The sidechain tracker also emits this card when it first sees the child, and the two
   * collapse on the shared tool-call id. Emitting it at declaration matters because a
   * backgrounded subagent produces no sidechain frames at all — verified on the wire — so the
   * tracker never runs for one and its card would otherwise stay an unlabeled "Task".
@@ -6276,6 +6276,7 @@ function buildClaudeSubagentCardDetail(
    type: "sub_agent",
    ...(facts.title ? { subAgentType: facts.title } : {}),
    ...(facts.description ? { description: facts.description } : {}),
    // COMPAT(subagent-log): remove after 2027-04-30.
    log: "",
    actions: [],
  };
@@ -4,7 +4,7 @@ import type { SDKMessage } from "@anthropic-ai/claude-agent-sdk";
 import { ClaudeSidechainTracker } from "./sidechain-tracker.js";
 describe("ClaudeSidechainTracker", () => {
-  it("retains a background child's actions across the parent finishing", () => {
+  it("keeps a background child's card across the parent finishing", () => {
    const tracker = new ClaudeSidechainTracker({
      getToolInput: () => ({ subagent_type: "general-purpose", description: "List files" }),
      isDescriptorOwnedElsewhere: () => true,
@@ -15,27 +15,67 @@ describe("ClaudeSidechainTracker", () => {
        parent_tool_use_id: "task-1",
        message: { content: [{ type: "tool_use", id, name: "Bash", input: { command } }] },
      }) as unknown as SDKMessage;
-    tracker.handleMessage(action("ls", "ls -1"), "task-1");
+    const parentCards = (events: ReturnType<typeof tracker.handleMessage>) =>
-    expect(tracker.finishAll("completed")).toEqual([]);
+      events.filter((event) => event.type === "timeline");
-    const events = tracker.handleMessage(action("pwd", "pwd"), "task-1");
+    const childCallIds = (events: ReturnType<typeof tracker.handleMessage>) =>
-    expect(events).toContainEqual(
+      events.flatMap((event) =>
-      expect.objectContaining({
+        event.type === "provider_subagent" &&
-        type: "timeline",
+        event.event.type === "timeline" &&
-        item: expect.objectContaining({
+        event.event.item.type === "tool_call"
-          detail: expect.objectContaining({ log: "[Bash] ls -1\n[Bash] pwd" }),
+          ? [event.event.item.callId]
-        }),
+          : [],
      }),
      );
    expect(parentCards(tracker.handleMessage(action("ls", "ls -1"), "task-1"))).toHaveLength(1);
    expect(tracker.finishAll("completed")).toEqual([]);
    const afterFinish = tracker.handleMessage(action("pwd", "pwd"), "task-1");
    expect(parentCards(afterFinish)).toEqual([]);
    expect(childCallIds(afterFinish)).toEqual(["pwd"]);
    tracker.delete("task-1");
    const next = tracker.handleMessage(action("next", "ls"), "task-1");
-    expect(next).toContainEqual(
+    expect(parentCards(next)).toHaveLength(1);
-      expect.objectContaining({
+    expect(childCallIds(next)).toEqual(["next"]);
-        type: "timeline",
+  });
-        item: expect.objectContaining({
+
-          detail: expect.objectContaining({ log: "[Bash] ls" }),
+  it("shows a streamed child tool call's input once the assistant message brings it", () => {
-        }),
+    const tracker = new ClaudeSidechainTracker({ getToolInput: () => null });
-      }),
+    const frames = [
      {
        type: "stream_event",
        parent_tool_use_id: "task-1",
        event: {
          type: "content_block_start",
          index: 0,
          content_block: { type: "tool_use", id: "bash-1", name: "Bash", input: {} },
        },
      },
      {
        type: "assistant",
        parent_tool_use_id: "task-1",
        message: {
          content: [
            { type: "tool_use", id: "bash-1", name: "Bash", input: { command: "echo child" } },
          ],
        },
      },
    ] as unknown as SDKMessage[];
    const childCards = frames
      .flatMap((frame) => tracker.handleMessage(frame, "task-1"))
      .flatMap((event) =>
        event.type === "provider_subagent" &&
        event.event.type === "timeline" &&
        event.event.item.type === "tool_call"
          ? [event.event.item]
          : [],
      );
    expect(childCards.at(-1)).toMatchObject({
      callId: "bash-1",
      status: "running",
      detail: { type: "shell", command: "echo child" },
    });
  });
  it("uses Claude's native agent name for the provider subagent title", () => {
@@ -5,7 +5,6 @@ import {
  mapClaudeFailedToolCall,
  mapClaudeRunningToolCall,
 } from "./tool-call-mapper.js";
 import { buildToolCallDisplayModel } from "@getpaseo/protocol/tool-call-display";
 import {
  isClaudeSubagentHandbackToolName,
  readClaudeSubagentHandback,
@@ -20,21 +19,17 @@ interface ClaudeContentChunk {
 type ClaudeToolCallItem = Extract<AgentTimelineItem, { type: "tool_call" }>;
-interface SubAgentActionEntry {
+interface SubAgentChildCall {
  index: number;
  toolName: string;
  input: unknown;
  summary?: string;
 }
 interface SubAgentActivityState {
  name?: string;
  subAgentType?: string;
  description?: string;
-  actions: SubAgentActionEntry[];
+  /** The child's tool calls awaiting results, which carry no input of their own. */
-  actionKeys: string[];
+  runningCalls: Map<string, SubAgentChildCall>;
  nextActionIndex: number;
  actionIndexByKey: Map<string, number>;
  completedActionKeys: Set<string>;
 }
@@ -44,7 +39,6 @@ interface SubAgentActionCandidate {
  input: unknown;
 }
 const MAX_SUB_AGENT_LOG_ENTRIES = 200;
 const MAX_SUB_AGENT_SUMMARY_CHARS = 160;
 function readTrimmedString(value: unknown): string | undefined {
@@ -79,8 +73,7 @@ export class ClaudeSidechainTracker {
    needsSyntheticParentToolCard?: (toolUseId: string) => boolean;
    /**
     * The parent's tool call once Claude has answered it. A background child streams its frames
-     * after that answer, so its card keeps the settled status and output and gains the child's
+     * after that answer, so its card keeps the settled status and output.
     * action log.
     */
    getSettledParentToolCall?: (toolUseId: string) => ClaudeToolCallItem | undefined;
  }) {
@@ -91,28 +84,27 @@ export class ClaudeSidechainTracker {
  }
  handleMessage(message: SDKMessage, parentToolUseId: string): AgentStreamEvent[] {
    const existingState = this.activeSidechains.get(parentToolUseId);
    const state =
-      this.activeSidechains.get(parentToolUseId) ??
+      existingState ??
      ({
-        actions: [],
+        runningCalls: new Map<string, SubAgentChildCall>(),
        actionKeys: [],
        nextActionIndex: 1,
        actionIndexByKey: new Map<string, number>(),
        completedActionKeys: new Set<string>(),
      } satisfies SubAgentActivityState);
    this.activeSidechains.set(parentToolUseId, state);
-    const contextUpdated = this.updateSubAgentContextFromTaskInput(state, parentToolUseId);
+    // The parent card is a launch marker: it changes only when the child is first seen or the
    // task input names it differently, never with the child's activity.
    const cardUpdated =
      this.updateSubAgentContextFromTaskInput(state, parentToolUseId) || !existingState;
    const actionCandidates = this.extractSubAgentActionCandidates(message);
    const childTimelineItems = [
      ...this.extractSubAgentTimelineItems(message, state),
      ...this.extractSubAgentToolResults(message, state),
    ];
    let actionUpdated = false;
    for (const action of actionCandidates) {
      if (state.completedActionKeys.has(action.key)) continue;
-      if (this.appendSubAgentAction(state, action)) {
+      if (this.trackChildCall(state, action)) {
        actionUpdated = true;
        const toolCall = mapClaudeRunningToolCall({
          name: action.toolName,
          callId: action.key,
@@ -125,7 +117,7 @@ export class ClaudeSidechainTracker {
      }
    }
-    if (!contextUpdated && !actionUpdated && childTimelineItems.length === 0) {
+    if (!cardUpdated && childTimelineItems.length === 0) {
      return [];
    }
@@ -145,11 +137,8 @@ export class ClaudeSidechainTracker {
      type: "sub_agent",
      ...(state.subAgentType ? { subAgentType: state.subAgentType } : {}),
      ...(state.description ? { description: state.description } : {}),
-      log: state.actions
+      // COMPAT(subagent-log): remove after 2027-04-30.
-        .map((action) =>
+      log: "",
          action.summary ? `[${action.toolName}] ${action.summary}` : `[${action.toolName}]`,
        )
        .join("\n"),
      actions: [],
    };
@@ -170,7 +159,8 @@ export class ClaudeSidechainTracker {
          },
        ];
-    const parentCard: AgentStreamEvent[] = this.needsSyntheticParentToolCard(parentToolUseId)
+    const parentCard: AgentStreamEvent[] =
      cardUpdated && this.needsSyntheticParentToolCard(parentToolUseId)
        ? [
            {
              type: "timeline",
@@ -303,8 +293,7 @@ export class ClaudeSidechainTracker {
      if (!isClaudeContentChunk(block) || !block.type.endsWith("tool_result")) continue;
      const callId = readTrimmedString(block.tool_use_id);
      if (!callId || state.completedActionKeys.has(callId)) continue;
-      const actionIndex = state.actionIndexByKey.get(callId);
+      const action = state.runningCalls.get(callId);
      const action = actionIndex === undefined ? undefined : state.actions[actionIndex];
      const toolName = action?.toolName ?? readTrimmedString(block.tool_name);
      if (!toolName) continue;
      const params = {
@@ -317,6 +306,7 @@ export class ClaudeSidechainTracker {
        ? mapClaudeFailedToolCall({ ...params, error: block })
        : mapClaudeCompletedToolCall(params);
      if (toolCall) {
        state.runningCalls.delete(callId);
        state.completedActionKeys.add(callId);
        items.push(toolCall);
      }
@@ -412,13 +402,12 @@ export class ClaudeSidechainTracker {
    const key =
      readTrimmedString(block.id) ??
      `stream:${block.name}:${typeof event.index === "number" ? event.index : 0}`;
-    return [
+    // A streamed call starts with `{}` until its input arrives, so an empty input is not final.
-      {
+    const input =
-        key,
+      block.input && typeof block.input === "object" && Object.keys(block.input).length > 0
-        toolName: block.name,
+        ? block.input
-        input: block.input ?? null,
+        : null;
-      },
+    return [{ key, toolName: block.name, input }];
    ];
  }
  private extractSubAgentActionCandidates(message: SDKMessage): SubAgentActionCandidate[] {
@@ -448,84 +437,20 @@ export class ClaudeSidechainTracker {
    return [];
  }
-  private appendSubAgentAction(
+  /** Returns whether the call is new or has gained its input, so its running card changes. */
  private trackChildCall(
    state: SubAgentActivityState,
    candidate: SubAgentActionCandidate,
  ): boolean {
-    const normalizedToolName = readTrimmedString(candidate.toolName);
+    const toolName = readTrimmedString(candidate.toolName);
-    if (!normalizedToolName) {
+    if (!toolName) {
      return false;
    }
-
+    const existing = state.runningCalls.get(candidate.key);
-    const summary = this.deriveSubAgentActionSummary(normalizedToolName, candidate.input);
+    if (existing && (existing.input !== null || candidate.input === null)) {
    const existingIndex = state.actionIndexByKey.get(candidate.key);
    if (existingIndex !== undefined) {
      const existing = state.actions[existingIndex];
      if (!existing) {
      return false;
    }
-      const nextSummary = existing.summary ?? summary;
+    state.runningCalls.set(candidate.key, { toolName, input: candidate.input });
      if (existing.toolName === normalizedToolName && existing.summary === nextSummary) {
        return false;
      }
      state.actions[existingIndex] = {
        ...existing,
        toolName: normalizedToolName,
        input: existing.input ?? candidate.input,
        ...(nextSummary ? { summary: nextSummary } : {}),
      };
    return true;
  }
    state.actions.push({
      index: state.nextActionIndex,
      toolName: normalizedToolName,
      input: candidate.input,
      ...(summary ? { summary } : {}),
    });
    state.nextActionIndex += 1;
    state.actionKeys.push(candidate.key);
    this.trimSubAgentTail(state);
    this.rebuildSubAgentActionIndex(state);
    return true;
  }
  private trimSubAgentTail(state: SubAgentActivityState): void {
    while (state.actions.length > MAX_SUB_AGENT_LOG_ENTRIES) {
      state.actions.shift();
      const removedKey = state.actionKeys.shift();
      if (removedKey) state.completedActionKeys.delete(removedKey);
    }
  }
  private rebuildSubAgentActionIndex(state: SubAgentActivityState): void {
    state.actionIndexByKey.clear();
    for (let index = 0; index < state.actionKeys.length; index += 1) {
      const key = state.actionKeys[index];
      if (key) {
        state.actionIndexByKey.set(key, index);
      }
    }
  }
  private deriveSubAgentActionSummary(toolName: string, input: unknown): string | undefined {
    const runningToolCall = mapClaudeRunningToolCall({
      name: toolName,
      callId: `sub-agent-summary-${toolName}`,
      input,
      output: null,
    });
    if (!runningToolCall) {
      return undefined;
    }
    const display = buildToolCallDisplayModel({
      name: runningToolCall.name,
      status: runningToolCall.status,
      error: runningToolCall.error,
      detail: runningToolCall.detail,
      metadata: runningToolCall.metadata,
    });
    return this.normalizeSubAgentText(display.summary);
  }
 }
@@ -77,12 +77,19 @@ CHILD_SENTINEL in your own response.
        const completedChildIndex = events.findIndex(
          (event) =>
-            event.type === "timeline" &&
+            event.type === "provider_subagent" &&
-            event.item.type === "tool_call" &&
+            event.event.type === "upsert" &&
-            event.item.status === "completed" &&
+            event.event.status === "completed",
            event.item.detail.type === "sub_agent" &&
            event.item.detail.log.includes("CHILD_SENTINEL"),
        );
        const childAssistantText = events
          .flatMap((event) =>
            event.type === "provider_subagent" &&
            event.event.type === "timeline" &&
            event.event.item.type === "assistant_message"
              ? [event.event.item.text]
              : [],
          )
          .join("");
        const rootMessageIndexes = events.flatMap((event, index) =>
          event.type === "timeline" && event.item.type === "assistant_message" ? [index] : [],
        );
@@ -105,6 +112,7 @@ CHILD_SENTINEL in your own response.
          .map((item) => item.text)
          .join("");
        expect(topLevelAssistantText).not.toContain("CHILD_SENTINEL");
        expect(childAssistantText).toContain("CHILD_SENTINEL");
        expect(completedChildIndex).toBeGreaterThanOrEqual(0);
        expect(rootMessageIndexes[0]).toBeGreaterThan(completedChildIndex);
        expect(terminalIndexes).toHaveLength(1);
@@ -3524,7 +3524,7 @@ describe("Codex app-server provider", () => {
    ]);
  });
-  test("folds child-thread Codex activity into the parent sub-agent tool call", async () => {
+  test("keeps child-thread Codex activity out of the parent sub-agent card", async () => {
    const session = createSession();
    const events: AgentStreamEvent[] = [];
    session.subscribe((event) => events.push(event));
@@ -3562,7 +3562,6 @@ describe("Codex app-server provider", () => {
    });
    const timelineEvents = events.filter((event) => event.type === "timeline");
    expect(timelineEvents).toHaveLength(4);
    expect(timelineEvents.every((event) => event.item.type === "tool_call")).toBe(true);
    const finalItem = timelineEvents.at(-1)?.item;
    expect(finalItem).toMatchObject({
@@ -3574,7 +3573,7 @@ describe("Codex app-server provider", () => {
        type: "sub_agent",
        subAgentType: "Sub-agent",
        description: "Report findings.",
-        log: "[Assistant] Found the path.",
+        log: "",
        actions: [],
      },
    });
@@ -3651,13 +3650,9 @@ describe("Codex app-server provider", () => {
        id: "settled-child-thread",
        status: "completed",
      });
-      expect(events.at(-1)).toMatchObject({
+      expect(events.findLast((event) => event.type === "timeline")).toMatchObject({
        type: "timeline",
-        item: {
+        item: { callId: "call-settled-child", status: "completed" },
          callId: "call-settled-child",
          status: "completed",
          detail: { type: "sub_agent", log: "[Assistant] Late trailing output." },
        },
      });
      appServer.completesSubAgentActivity({
@@ -3962,6 +3957,8 @@ describe("Codex app-server provider", () => {
      createTestLogger(),
      async () => appServer.child,
    );
    const events: AgentStreamEvent[] = [];
    session.subscribe((event) => events.push(event));
    try {
      const resultPromise = session.run("Delegate the investigation, then report the result.");
@@ -4005,11 +4002,18 @@ describe("Codex app-server provider", () => {
        type: "tool_call",
        callId: "spawn-child-early",
        status: "completed",
-        detail: {
+        detail: { type: "sub_agent", log: "" },
          type: "sub_agent",
          log: "[Assistant] Early child findings.",
        },
      });
      expect(events).toContainEqual(
        expect.objectContaining({
          type: "provider_subagent",
          event: expect.objectContaining({
            type: "timeline",
            id: "child-thread-early",
            item: expect.objectContaining({ type: "assistant_message" }),
          }),
        }),
      );
      appServer.assertNoErrors();
    } finally {
      await session.close();
@@ -4080,10 +4084,7 @@ describe("Codex app-server provider", () => {
      expect(toolCalls.at(-1)).toMatchObject({
        callId: "spawn-child-stable",
        status: "canceled",
-        detail: {
+        detail: { type: "sub_agent", log: "" },
          type: "sub_agent",
          log: "[Assistant] Still on the same card.",
        },
      });
      appServer.assertNoErrors();
    } finally {
@@ -4163,11 +4164,10 @@ describe("Codex app-server provider", () => {
      const result = await resultPromise;
      const toolCalls = result.timeline.filter((item) => item.type === "tool_call");
-      expect(toolCalls.map((item) => item.status)).toEqual(["running", "completed", "completed"]);
+      expect(toolCalls.map((item) => item.status)).toEqual(["running", "completed"]);
      expect(toolCalls.at(-1)).toMatchObject({
        callId: "spawn-child-late-compaction",
        status: "completed",
        detail: { type: "sub_agent", log: "[Compacted]" },
      });
      appServer.assertNoErrors();
    } finally {
@@ -4175,7 +4175,7 @@ describe("Codex app-server provider", () => {
    }
  });
-  test("projects legacy child tools into one stable sub-agent log", async () => {
+  test("routes legacy child tools to the child timeline", async () => {
    const appServer = createFakeCodexAppServer();
    const session = new CodexAppServerAgentSession(
      createConfig({ cwd: "/workspace/project" }),
@@ -4183,6 +4183,8 @@ describe("Codex app-server provider", () => {
      createTestLogger(),
      async () => appServer.child,
    );
    const events: AgentStreamEvent[] = [];
    session.subscribe((event) => events.push(event));
    try {
      const resultPromise = session.run("Delegate the implementation.");
@@ -4225,19 +4227,26 @@ describe("Codex app-server provider", () => {
      expect(finalToolCall).toMatchObject({
        callId: "spawn-legacy-tool-child",
        status: "completed",
-        detail: { type: "sub_agent" },
+        detail: { type: "sub_agent", log: "" },
      });
-      if (finalToolCall?.detail.type === "sub_agent") {
+      const childToolCalls = events.flatMap((event) =>
-        expect(finalToolCall.detail.log.match(/\[Shell\]/g)).toHaveLength(1);
+        event.type === "provider_subagent" &&
-        expect(finalToolCall.detail.log).toContain("[Edit]");
+        event.event.type === "timeline" &&
-      }
+        event.event.id === "legacy-tool-child" &&
        event.event.item.type === "tool_call"
          ? [event.event.item]
          : [],
      );
      expect(new Set(childToolCalls.map((item) => item.detail.type))).toEqual(
        new Set(["shell", "edit"]),
      );
      appServer.assertNoErrors();
    } finally {
      await session.close();
    }
  });
-  test("keeps nested MultiAgentV2 output inside the root sub-agent card", async () => {
+  test("keeps nested MultiAgentV2 output out of the root sub-agent card", async () => {
    const session = createSession();
    const events: AgentStreamEvent[] = [];
    session.subscribe((event) => events.push(event));
@@ -4297,8 +4306,22 @@ describe("Codex app-server provider", () => {
    expect(beforeParentCompletes.at(-1)).toMatchObject({
      callId: "spawn-child-root",
      status: "running",
-      detail: { type: "sub_agent", log: expect.stringContaining("Grandchild findings.") },
+      detail: { type: "sub_agent", log: "" },
    });
    expect(events).toContainEqual(
      expect.objectContaining({
        type: "provider_subagent",
        event: {
          type: "timeline",
          id: "grandchild-thread",
          item: {
            type: "assistant_message",
            messageId: "grandchild-message",
            text: "Grandchild findings.",
          },
        },
      }),
    );
    await asInternals(session).handleNotification("turn/completed", {
      threadId: "child-thread-root",
@@ -4365,13 +4388,20 @@ describe("Codex app-server provider", () => {
      "child-thread-root",
      "child-thread-root",
    ]);
-    expect(events.at(-1)).toMatchObject({
+    expect(events).toContainEqual(
      expect.objectContaining({
        type: "provider_subagent",
        event: {
          type: "timeline",
          id: "grandchild-thread",
          item: {
-        callId: "spawn-child-root",
+            type: "assistant_message",
-        detail: { type: "sub_agent", log: expect.stringContaining("Still nested.") },
+            messageId: "grandchild-after-wait",
            text: "Still nested.",
          },
-    });
+        },
      }),
    );
  });
  test("never treats an unmapped foreign terminal as the root terminal", async () => {
@@ -4791,7 +4821,7 @@ describe("Codex app-server provider", () => {
    expect(events).toHaveLength(eventCountAfterSpawn);
  });
-  test("keeps child context compaction inside the child card", async () => {
+  test("keeps child context compaction on the child timeline", async () => {
    const session = createSession();
    const events: AgentStreamEvent[] = [];
    session.subscribe((event) => events.push(event));
@@ -4824,10 +4854,70 @@ describe("Codex app-server provider", () => {
        (item) => item.type === "tool_call" && item.callId === "spawn-child-compaction",
      ),
    ).toBe(true);
-    expect(timelineItems.at(-1)).toMatchObject({
+    expect(
-      type: "tool_call",
+      events.flatMap((event) =>
-      detail: { type: "sub_agent", log: "[Compacted]" },
+        event.type === "provider_subagent" && event.event.type === "timeline" ? [event.event] : [],
      ),
    ).toEqual([
      {
        type: "timeline",
        id: "child-thread-compaction",
        item: { type: "compaction", status: "loading" },
      },
      {
        type: "timeline",
        id: "child-thread-compaction",
        item: { type: "compaction", status: "completed" },
      },
    ]);
  });
  test("settles a child compaction once when the item completion is missing or duplicated", async () => {
    const session = createSession();
    const events: AgentStreamEvent[] = [];
    session.subscribe((event) => events.push(event));
    for (const child of ["compacted-child", "turn-ended-child"]) {
      await asInternals(session).handleNotification("item/completed", {
        threadId: "test-thread",
        item: {
          type: "subAgentActivity",
          id: `spawn-${child}`,
          kind: "started",
          agentThreadId: child,
          agentPath: `/root/${child}`,
        },
      });
      await asInternals(session).handleNotification("item/started", {
        threadId: child,
        item: { type: "contextCompaction", id: `${child}-compaction` },
      });
    }
    await asInternals(session).handleNotification("thread/compacted", {
      threadId: "compacted-child",
    });
    await asInternals(session).handleNotification("item/completed", {
      threadId: "compacted-child",
      item: { type: "contextCompaction", id: "compacted-child-compaction" },
    });
    await asInternals(session).handleNotification("turn/completed", {
      threadId: "turn-ended-child",
      turn: { status: "completed" },
    });
    const compactions = events.flatMap((event) =>
      event.type === "provider_subagent" && event.event.type === "timeline"
        ? [
            `${event.event.id} ${event.event.item.type === "compaction" ? event.event.item.status : ""}`,
          ]
        : [],
    );
    expect(compactions).toEqual([
      "compacted-child loading",
      "turn-ended-child loading",
      "compacted-child completed",
      "turn-ended-child completed",
    ]);
  });
  test("keeps the parent sub-agent running when a child command fails during the child turn", async () => {
@@ -4862,7 +4952,7 @@ describe("Codex app-server provider", () => {
      },
    });
-    expect(events.at(-1)?.item).toMatchObject({
+    expect(events.findLast((event) => event.type === "timeline")?.item).toMatchObject({
      type: "tool_call",
      callId: "call-sub-agent-child-command-failure",
      name: "Sub-agent",
@@ -5157,7 +5247,7 @@ describe("Codex app-server provider", () => {
    );
    expect(liveToolCalls.at(-1)).toMatchObject({
      status: "running",
-      detail: { type: "sub_agent", log: "[Assistant] More findings after resume." },
+      detail: { type: "sub_agent", log: "" },
    });
    liveEvents.length = 0;
@@ -5170,12 +5260,12 @@ describe("Codex app-server provider", () => {
      itemId: "legacy-child-message-after-resume",
      delta: "Legacy findings after resume.",
    });
-    expect(liveEvents.at(-1)).toMatchObject({
+    expect(liveEvents.findLast((event) => event.type === "timeline")).toMatchObject({
      type: "timeline",
      item: {
        callId: "legacy-spawn-history",
        status: "running",
-        detail: { type: "sub_agent", log: "[Assistant] Legacy findings after resume." },
+        detail: { type: "sub_agent", log: "" },
      },
    });
  });
@@ -49,10 +49,10 @@ import { Dirent } from "node:fs";
 import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
 import { isDeepStrictEqual } from "node:util";
 import { z } from "zod";
 import { renderPromptAttachmentAsText } from "../prompt-attachments.js";
 import { composeSystemPromptParts } from "../system-prompt.js";
 import { curateAgentActivity } from "../activity-curator.js";
 import { CodexAsyncQuestions, codexAsyncQuestionToTimeline } from "./codex/async-questions.js";
 import {
  mapCodexToolCallEnvelope,
@@ -3384,8 +3384,6 @@ interface CodexSubAgentCallState {
  activityItemIds: Set<string>;
  pendingCommandOutputDeltas: Map<string, string[]>;
  pendingFileChangeOutputDeltas: Map<string, string[]>;
  childItemOrder: string[];
  childItems: Map<string, AgentTimelineItem>;
  childThreadIds: Set<string>;
 }
@@ -3487,6 +3485,9 @@ export class CodexAppServerAgentSession implements AgentSession {
  private compactionTriggerByItemId = new Map<string, "auto" | "manual">();
  private pendingRootCompactionItemIds = new Set<string>();
  private pendingAnonymousRootCompactions = 0;
  // Child threads with a compaction shown as loading. Some Codex builds settle it only through
  // `thread/compacted` or the end of the child's turn.
  private pendingChildCompactionThreadIds = new Set<string>();
  // Codex can report one completed compaction through both channels:
  // `thread/compacted` and a completed `contextCompaction` item.
  private unpairedCompactionNotificationCompletions = 0;
@@ -5516,6 +5517,9 @@ export class CodexAppServerAgentSession implements AgentSession {
      case "patch_apply_completed":
        this.handlePatchApplyCompletedNotification(parsed, callId);
        return;
      case "context_compacted":
        this.settleChildCompaction(parsed.threadId);
        return;
      default:
        // Aggregate child telemetry is redundant and must not leak into the
        // root timeline. Concrete legacy tools are projected above for Codex
@@ -5692,20 +5696,10 @@ export class CodexAppServerAgentSession implements AgentSession {
        activityItemIds: new Set<string>(),
        pendingCommandOutputDeltas: new Map<string, string[]>(),
        pendingFileChangeOutputDeltas: new Map<string, string[]>(),
        childItemOrder: [],
        childItems: new Map<string, AgentTimelineItem>(),
        childThreadIds: new Set<string>(),
      } satisfies CodexSubAgentCallState);
-    state.toolCall = {
+    state.toolCall = timelineItem;
      ...timelineItem,
      detail: {
        ...timelineItem.detail,
        log:
          timelineItem.detail.log ||
          (state.toolCall.detail.type === "sub_agent" ? state.toolCall.detail.log : ""),
      },
    };
    state.parentCallId ??= parentCallId;
    state.parentSubagentId ??= parentSubagentId;
    const activity = readCodexSubAgentActivity(rawItem);
@@ -5758,25 +5752,17 @@ export class CodexAppServerAgentSession implements AgentSession {
    const activityToolCall = mapCodexToolCallFromThreadItem(rawItem, {
      cwd: this.config.cwd ?? null,
    });
-    if (
+    const subAgentType =
-      activityToolCall?.detail.type === "sub_agent" &&
+      activityToolCall?.detail.type === "sub_agent"
-      state.toolCall.detail.type === "sub_agent"
+        ? activityToolCall.detail.subAgentType
-    ) {
+        : undefined;
      state.toolCall = {
        ...state.toolCall,
        detail: {
          ...state.toolCall.detail,
          subAgentType: activityToolCall.detail.subAgentType,
        },
      };
    }
    let nextStatus: ToolCallTimelineItem["status"] | undefined = "running";
    if (activity.kind === "interrupted") {
      nextStatus = "canceled";
    } else if (isTerminalSubAgentStatus(state.toolCall.status)) {
      nextStatus = undefined;
    }
-    this.emitSubAgentActivityUpdate(callId, nextStatus);
+    this.emitSubAgentActivityUpdate(callId, nextStatus, { subAgentType });
    return true;
  }
@@ -5817,7 +5803,13 @@ export class CodexAppServerAgentSession implements AgentSession {
  ): boolean {
    if (
      childSubAgentCallId &&
-      this.handleSubAgentContextCompactionItem(childSubAgentCallId, parsed.item, "completed")
+      parsed.threadId &&
      this.handleSubAgentContextCompactionItem(
        childSubAgentCallId,
        parsed.threadId,
        parsed.item,
        "completed",
      )
    ) {
      return true;
    }
@@ -5827,17 +5819,6 @@ export class CodexAppServerAgentSession implements AgentSession {
    );
  }
  private upsertSubAgentChildItem(callId: string, itemId: string, item: AgentTimelineItem): void {
    const state = this.subAgentCallsByCallId.get(callId);
    if (!state) {
      return;
    }
    if (!state.childItems.has(itemId)) {
      state.childItemOrder.push(itemId);
    }
    state.childItems.set(itemId, item);
  }
  private emitCodexToolTimelineItem(
    timelineItem: ToolCallTimelineItem,
    subAgentCallId: string | null,
@@ -5847,7 +5828,6 @@ export class CodexAppServerAgentSession implements AgentSession {
      this.emitEvent({ type: "timeline", provider: CODEX_PROVIDER, item: timelineItem });
      return;
    }
    this.upsertSubAgentChildItem(subAgentCallId, timelineItem.callId, timelineItem);
    const state = this.subAgentCallsByCallId.get(subAgentCallId);
    if (state) {
      const targetThreadIds = childThreadId ? [childThreadId] : state.childThreadIds;
@@ -5861,26 +5841,15 @@ export class CodexAppServerAgentSession implements AgentSession {
    );
  }
  private getSubAgentChildTimeline(state: CodexSubAgentCallState): AgentTimelineItem[] {
    return state.childItemOrder
      .map((itemId) => state.childItems.get(itemId))
      .filter((item): item is AgentTimelineItem => Boolean(item));
  }
  private emitSubAgentActivityUpdate(
    callId: string,
    status?: ToolCallTimelineItem["status"],
-    options?: { reopen?: boolean },
+    options?: { reopen?: boolean; subAgentType?: string },
  ): void {
    const state = this.subAgentCallsByCallId.get(callId);
    if (!state || state.toolCall.detail.type !== "sub_agent") {
      return;
    }
    const childTimeline = this.getSubAgentChildTimeline(state);
    const log =
      childTimeline.length > 0
        ? curateAgentActivity(childTimeline, { labelAssistantMessages: true })
        : "";
    let resolvedStatus = status ?? state.toolCall.status;
    if (
      status === "running" &&
@@ -5889,16 +5858,12 @@ export class CodexAppServerAgentSession implements AgentSession {
    ) {
      resolvedStatus = state.toolCall.status;
    }
-    for (const childThreadId of state.childThreadIds) {
+    const baseToolCall = options?.subAgentType
-      this.emitProviderSubagentUpsert(childThreadId, state, resolvedStatus);
+      ? {
    }
    const baseToolCall = {
          ...state.toolCall,
-      detail: {
+          detail: { ...state.toolCall.detail, subAgentType: options.subAgentType },
-        ...state.toolCall.detail,
+        }
-        log,
+      : state.toolCall;
      },
    };
    const nextToolCall: ToolCallTimelineItem =
      resolvedStatus === "failed"
        ? {
@@ -5911,10 +5876,14 @@ export class CodexAppServerAgentSession implements AgentSession {
            status: resolvedStatus,
            error: null,
          };
    // The card is a launch marker: the child's activity streams to its own timeline, so the card
    // is re-sent only when its status or label changes.
    const cardChanged = !isDeepStrictEqual(nextToolCall, state.toolCall);
    state.toolCall = nextToolCall;
-    if (state.parentCallId && state.parentCallId !== callId) {
+    for (const childThreadId of state.childThreadIds) {
-      this.upsertSubAgentChildItem(state.parentCallId, state.callId, nextToolCall);
+      this.emitProviderSubagentUpsert(childThreadId, state, resolvedStatus);
-      this.emitSubAgentActivityUpdate(state.parentCallId);
+    }
    if (!cardChanged || (state.parentCallId && state.parentCallId !== callId)) {
      return;
    }
    this.emitEvent({ type: "timeline", provider: CODEX_PROVIDER, item: nextToolCall });
@@ -6022,7 +5991,6 @@ export class CodexAppServerAgentSession implements AgentSession {
  ): void {
    this.applyBufferedDeltaTextToTimelineItem(timelineItem, itemId);
    if (itemId) {
      this.upsertSubAgentChildItem(callId, itemId, timelineItem);
      this.pendingAgentMessages.delete(itemId);
      this.pendingReasoning.delete(itemId);
      this.pendingCommandOutputDeltas.delete(itemId);
@@ -6033,19 +6001,29 @@ export class CodexAppServerAgentSession implements AgentSession {
  private handleSubAgentContextCompactionItem(
    callId: string,
    childThreadId: string,
    item: { id?: string; type?: string; [key: string]: unknown },
    status: "loading" | "completed",
  ): boolean {
    if (!this.isContextCompactionItem(item)) {
      return false;
    }
-    if (item.id) {
+    if (status === "loading") {
-      this.upsertSubAgentChildItem(callId, item.id, { type: "compaction", status });
+      this.pendingChildCompactionThreadIds.add(childThreadId);
      this.emitProviderSubagentTimeline(childThreadId, { type: "compaction", status });
    } else {
      this.settleChildCompaction(childThreadId);
    }
    this.emitSubAgentActivityUpdate(callId);
    return true;
  }
  private settleChildCompaction(childThreadId: string): void {
    if (this.pendingChildCompactionThreadIds.delete(childThreadId)) {
      this.emitProviderSubagentTimeline(childThreadId, { type: "compaction", status: "completed" });
    }
  }
  private shouldSkipCompletedThreadItem(
    timelineItem: AgentTimelineItem,
    normalizedItemType: string | undefined,
@@ -6076,11 +6054,6 @@ export class CodexAppServerAgentSession implements AgentSession {
            text: parsed.delta,
          });
        }
        this.upsertSubAgentChildItem(subAgentCallId, parsed.itemId, {
          type: "assistant_message",
          messageId: parsed.itemId,
          text,
        });
        this.emitSubAgentActivityUpdate(subAgentCallId, "running");
        return;
      }
@@ -6114,10 +6087,6 @@ export class CodexAppServerAgentSession implements AgentSession {
            text: parsed.delta,
          });
        }
        this.upsertSubAgentChildItem(subAgentCallId, parsed.itemId, {
          type: "reasoning",
          text: prev.join(""),
        });
        this.emitSubAgentActivityUpdate(subAgentCallId, "running");
        return;
      }
@@ -6185,6 +6154,7 @@ export class CodexAppServerAgentSession implements AgentSession {
  ): void {
    const subAgentCallId = this.getSubAgentCallIdForThread(parsed.threadId);
    if (subAgentCallId) {
      if (parsed.threadId) this.settleChildCompaction(parsed.threadId);
      let status: ToolCallTimelineItem["status"] = "completed";
      if (parsed.status === "failed") {
        status = "failed";
@@ -6771,7 +6741,13 @@ export class CodexAppServerAgentSession implements AgentSession {
    const childSubAgentCallId = this.getSubAgentCallIdForThread(parsed.threadId);
    if (
      childSubAgentCallId &&
-      this.handleSubAgentContextCompactionItem(childSubAgentCallId, parsed.item, "loading")
+      parsed.threadId &&
      this.handleSubAgentContextCompactionItem(
        childSubAgentCallId,
        parsed.threadId,
        parsed.item,
        "loading",
      )
    ) {
      return;
    }
@@ -6802,9 +6778,6 @@ export class CodexAppServerAgentSession implements AgentSession {
    });
    if (childSubAgentCallId) {
      this.emitStartedProviderSubagentItem(parsed.threadId, timelineItem);
      if (parsed.item.id) {
        this.upsertSubAgentChildItem(childSubAgentCallId, parsed.item.id, timelineItem);
      }
      this.emitSubAgentActivityUpdate(childSubAgentCallId, "running");
      await this.replayPendingSubAgentNotifications(registeredChildThreadIds);
      return;
@@ -6858,9 +6831,6 @@ export class CodexAppServerAgentSession implements AgentSession {
      if (parsed.threadId) {
        this.emitProviderSubagentTimeline(parsed.threadId, timelineItem);
      }
      if (itemId) {
        this.upsertSubAgentChildItem(childSubAgentCallId, itemId, timelineItem);
      }
      this.emitSubAgentActivityUpdate(childSubAgentCallId, "running");
      return;
    }
@@ -950,6 +950,7 @@ function mapCollabAgentToolCallItem(
    type: "sub_agent",
    subAgentType: "Sub-agent",
    ...(item.prompt ? { description: item.prompt } : {}),
    // COMPAT(subagent-log): remove after 2027-04-30.
    log: "",
    actions: [],
  };
@@ -1006,6 +1007,7 @@ function mapSubAgentActivityItem(
      type: "sub_agent",
      subAgentType: nativeName,
      description,
      // COMPAT(subagent-log): remove after 2027-04-30.
      log: "",
      actions: [],
    },
@@ -69,7 +69,7 @@ import {
  type OmpRuntimeOptions,
 } from "./provider-config.js";
 export { formatOmpVersionSupport, resolveOmpDiagnosticPaths } from "./provider-config.js";
-import { OmpSubagentCardTracker, type OmpSubagentCardScheduler } from "./subagent-card-tracker.js";
+import { OmpSubagentCardTracker } from "./subagent-card-tracker.js";
 import { ompSkillPromptUserText, shouldDisplayOmpCustomMessage } from "./custom-message.js";
 import { getUserMessageText } from "./message-history.js";
 import { mapOmpSystemNoticeToNotification } from "./system-notice.js";
@@ -130,7 +130,6 @@ export interface OmpAgentClientOptions {
  logger: Logger;
  runtimeSettings?: ProviderRuntimeSettings;
  runtime?: OmpRuntime;
  subagentCardScheduler?: OmpSubagentCardScheduler;
  providerIdleScheduler?: OmpProviderIdleScheduler;
  noTurnScheduler?: OmpNoTurnScheduler;
  usagePollScheduler?: OmpUsagePollScheduler;
@@ -205,7 +204,6 @@ interface OmpAgentSessionOptions {
  initialState: OmpSessionState;
  currentModeId?: string | null;
  logger: Logger;
  subagentCardScheduler?: OmpSubagentCardScheduler;
  providerIdleScheduler?: OmpProviderIdleScheduler;
  noTurnScheduler?: OmpNoTurnScheduler;
  usagePollScheduler?: OmpUsagePollScheduler;
@@ -773,9 +771,7 @@ export class OmpAgentSession implements AgentSession {
        this.logger.debug({ err: error }, "OMP context usage poll failed");
      },
    });
-    this.subagentCardTracker = new OmpSubagentCardTracker({
+    this.subagentCardTracker = new OmpSubagentCardTracker();
      scheduler: options.subagentCardScheduler,
    });
    this.lastKnownThinkingOptionId =
      normalizeOmpThinkingOption(options.config.thinkingOptionId) ??
      this.state.thinkingLevel ??
@@ -2155,8 +2151,7 @@ export class OmpAgentSession implements AgentSession {
    return mapOmpToolDetail(toolCall, result, {
      toolCallId,
      bridgedTool: this.hostTools?.bridge?.tool(toolCall.toolName),
-      mapSubagentDetail: (detail) =>
+      mapSubagentDetail: (detail) => this.subagentCardTracker.detailFor(toolCallId, detail),
        this.subagentCardTracker.detailFor(toolCallId, detail) ?? detail,
    });
  }
@@ -2246,7 +2241,6 @@ export class OmpAgentClient implements AgentClient {
  private readonly logger: Logger;
  private readonly runtimeSettings?: ProviderRuntimeSettings;
  private readonly subagentCardScheduler?: OmpSubagentCardScheduler;
  private readonly providerIdleScheduler?: OmpProviderIdleScheduler;
  private readonly noTurnScheduler?: OmpNoTurnScheduler;
  private readonly usagePollScheduler?: OmpUsagePollScheduler;
@@ -2265,7 +2259,6 @@ export class OmpAgentClient implements AgentClient {
    );
    this.logger = options.logger;
    this.runtimeSettings = runtimeSettings;
    this.subagentCardScheduler = options.subagentCardScheduler;
    this.providerIdleScheduler = options.providerIdleScheduler;
    this.noTurnScheduler = options.noTurnScheduler;
    this.usagePollScheduler = options.usagePollScheduler;
@@ -2349,7 +2342,6 @@ export class OmpAgentClient implements AgentClient {
        initialState,
        currentModeId: launchMode.modeId,
        logger: this.logger,
        subagentCardScheduler: this.subagentCardScheduler,
        providerIdleScheduler: this.providerIdleScheduler,
        noTurnScheduler: this.noTurnScheduler,
        usagePollScheduler: this.usagePollScheduler,
@@ -2421,7 +2413,6 @@ export class OmpAgentClient implements AgentClient {
        initialState,
        currentModeId: launchMode.modeId,
        logger: this.logger,
        subagentCardScheduler: this.subagentCardScheduler,
        providerIdleScheduler: this.providerIdleScheduler,
        noTurnScheduler: this.noTurnScheduler,
        usagePollScheduler: this.usagePollScheduler,
@@ -637,7 +637,7 @@ describe("OMP history mapper", () => {
            subAgentType: "explore",
            description: "Inspect files",
            childSessionId: "/tmp/omp-task/Explore.jsonl",
-            log: "done\ntranscript: /tmp/omp-task/Explore.jsonl",
+            log: "",
          },
          error: null,
        },
@@ -1,6 +1,6 @@
 import { describe, expect, test } from "vitest";
-import { OmpSubagentCardTracker, type OmpSubagentCardScheduler } from "./subagent-card-tracker.js";
+import { OmpSubagentCardTracker } from "./subagent-card-tracker.js";
 import type { OmpSubagentLifecyclePayload, OmpSubagentProgressPayload } from "./rpc-types.js";
 const PARENT_TOOL_CALL_ID = "task-1";
@@ -59,184 +59,84 @@ const PROGRESS: OmpSubagentProgressPayload[] = [
  },
 ];
 class ManualScheduler implements OmpSubagentCardScheduler {
  private currentMs = 0;
  private nextId = 1;
  private readonly timers = new Map<number, { dueMs: number; callback: () => void }>();
  now(): number {
    return this.currentMs;
  }
  setTimeout(callback: () => void, delayMs: number) {
    const id = this.nextId;
    this.nextId += 1;
    this.timers.set(id, { dueMs: this.currentMs + delayMs, callback });
    return { token: id };
  }
  clearTimeout(timer: { token: unknown }): void {
    if (typeof timer.token === "number") {
      this.timers.delete(timer.token);
    }
  }
  advance(ms: number): void {
    this.currentMs += ms;
    const dueTimers = [...this.timers.entries()]
      .filter(([, timer]) => timer.dueMs <= this.currentMs)
      .sort((left, right) => left[1].dueMs - right[1].dueMs);
    for (const [id, timer] of dueTimers) {
      if (this.timers.delete(id)) {
        timer.callback();
      }
    }
  }
 }
 describe("OmpSubagentCardTracker", () => {
-  test("folds lifecycle and progress into one throttled sub-agent detail", () => {
+  test("keeps the card a launch marker while the child runs", () => {
    const scheduler = new ManualScheduler();
    const emitted: string[] = [];
-    const tracker = new OmpSubagentCardTracker({
+    const emit = (toolCallId: string) => {
      scheduler,
      emitToolCall: (toolCallId) => {
      emitted.push(toolCallId);
      return true;
-      },
+    };
-    });
+    const tracker = new OmpSubagentCardTracker();
-    tracker.handleLifecycle(LIFECYCLE);
+    tracker.handleLifecycle(LIFECYCLE, emit);
    for (const payload of PROGRESS) {
-      tracker.handleProgress(payload);
+      tracker.handleProgress(payload, emit);
    }
    expect(emitted).toEqual([PARENT_TOOL_CALL_ID]);
    const detailBeforeTrailing = tracker.detailFor(PARENT_TOOL_CALL_ID, {
      type: "sub_agent",
      subAgentType: "task",
      description: "Task arg description wins",
      log: "",
    });
    expect(detailBeforeTrailing).toEqual({
      type: "sub_agent",
      subAgentType: "task",
      description: "Task arg description wins",
      childSessionId: SESSION_FILE,
      log: [
        "EchoSubagent started",
        "[bash] echo subagent-hi",
        "[yield]",
        "EchoSubagent completed",
      ].join("\n"),
    });
    scheduler.advance(500);
    expect(emitted).toEqual([PARENT_TOOL_CALL_ID, PARENT_TOOL_CALL_ID]);
  });
  test("aggregates batch progress streams into one index-prefixed log", () => {
    const scheduler = new ManualScheduler();
    const emitted: string[] = [];
    const tracker = new OmpSubagentCardTracker({
      scheduler,
      emitToolCall: (toolCallId) => {
        emitted.push(toolCallId);
        return true;
      },
    });
    tracker.handleLifecycle({
      id: "Explore",
      agent: "task",
      description: "Inspect files",
      status: "started",
      sessionFile: "/tmp/one.jsonl",
      parentToolCallId: "task.batch-1",
      index: 0,
    });
    scheduler.advance(600);
    tracker.handleProgress({
      index: 5,
      agent: "task",
      task: "Run tests",
      parentToolCallId: "task.batch-1",
      progress: {
        id: "Test",
        status: "running",
        description: "Run tests",
        recentTools: [{ tool: "bash", args: "npm test", endMs: 10 }],
      },
      sessionFile: "/tmp/two.jsonl",
    });
    expect(emitted).toEqual(["task.batch-1", "task.batch-1"]);
    expect(
-      tracker.detailFor("task.batch-1", {
+      tracker.detailFor(PARENT_TOOL_CALL_ID, {
        type: "sub_agent",
-        subAgentType: "batch",
+        subAgentType: "task",
-        actions: [],
+        description: "Task arg description wins",
        log: "",
      }),
    ).toEqual({
      type: "sub_agent",
-      subAgentType: "batch",
+      subAgentType: "task",
-      description: "Inspect files",
+      description: "Task arg description wins",
-      childSessionId: "/tmp/one.jsonl",
+      childSessionId: SESSION_FILE,
-      log: "[1/6] Explore started\n[6/6] [bash] npm test",
+      log: "",
      actions: [],
    });
  });
-  test("keeps dirty trailing state available for final detail and cancels it on cleanup", () => {
+  test("re-emits the card when a later event names the child", () => {
    const scheduler = new ManualScheduler();
    const emitted: string[] = [];
-    const tracker = new OmpSubagentCardTracker({
+    const emit = (toolCallId: string) => {
      scheduler,
      emitToolCall: (toolCallId) => {
      emitted.push(toolCallId);
      return true;
-      },
+    };
    const tracker = new OmpSubagentCardTracker();
    tracker.handleLifecycle({ ...LIFECYCLE, description: undefined, sessionFile: undefined }, emit);
    tracker.handleProgress(PROGRESS[0], emit);
    expect(emitted).toEqual([PARENT_TOOL_CALL_ID, PARENT_TOOL_CALL_ID]);
    expect(tracker.detailFor(PARENT_TOOL_CALL_ID, { type: "sub_agent", log: "" })).toEqual({
      type: "sub_agent",
      childSessionId: SESSION_FILE,
      log: "",
    });
-    tracker.handleLifecycle({
+    tracker.delete(PARENT_TOOL_CALL_ID);
-      id: "Explore",
+    expect(tracker.detailFor(PARENT_TOOL_CALL_ID, { type: "sub_agent", log: "" })).toEqual({
      agent: "task",
      description: "Inspect files",
      status: "started",
      parentToolCallId: "task-1",
      index: 0,
    });
    scheduler.advance(100);
    tracker.handleProgress({
      index: 0,
      agent: "task",
      task: "Inspect files",
      parentToolCallId: "task-1",
      progress: {
        id: "Explore",
        status: "running",
        recentOutput: ["found target file"],
      },
    });
    expect(emitted).toEqual(["task-1"]);
    expect(
      tracker.detailFor("task-1", {
      type: "sub_agent",
      log: "",
-      }).log,
+    });
-    ).toBe("Explore started\nfound target file");
+  });
  test("leaves the card alone when a later child of the same task starts", () => {
    const emitted: string[] = [];
    const emit = (toolCallId: string) => {
      emitted.push(toolCallId);
      return true;
    };
    const tracker = new OmpSubagentCardTracker();
    tracker.handleLifecycle(LIFECYCLE, emit);
    tracker.handleLifecycle(
      {
        ...LIFECYCLE,
        id: "Second",
        index: 1,
        description: "Second child",
        sessionFile: "/s.jsonl",
      },
      emit,
    );
-    tracker.delete("task-1");
+    expect(emitted).toEqual([PARENT_TOOL_CALL_ID]);
-    scheduler.advance(500);
+    expect(tracker.detailFor(PARENT_TOOL_CALL_ID, { type: "sub_agent", log: "" })).toEqual({
    expect(emitted).toEqual(["task-1"]);
    expect(
      tracker.detailFor("task-1", {
      type: "sub_agent",
-        log: "static",
+      description: "Run echo in subagent",
-      }).log,
+      childSessionId: SESSION_FILE,
-    ).toBe("static");
+      log: "",
    });
  });
 });
@@ -1,361 +1,106 @@
 import type { ToolCallDetail } from "../../agent-sdk-types.js";
 import type { OmpSubagentLifecyclePayload, OmpSubagentProgressPayload } from "./rpc-types.js";
-export interface OmpSubagentCardTimer {
+interface OmpSubagentCardChild {
  readonly token: unknown;
 }
 export interface OmpSubagentCardScheduler {
  now(): number;
  setTimeout(callback: () => void, delayMs: number): OmpSubagentCardTimer;
  clearTimeout(timer: OmpSubagentCardTimer): void;
 }
 export interface OmpSubagentCardTrackerOptions {
  scheduler?: OmpSubagentCardScheduler;
  emitToolCall?: (toolCallId: string) => boolean;
 }
 interface OmpSubagentLogLine {
  key: string;
  text: string;
 }
 interface OmpSubagentCardItem {
  index: number;
  description?: string;
  agent?: string;
  status?: "pending" | "running" | "completed" | "failed" | "aborted";
  childSessionId?: string;
  lines: OmpSubagentLogLine[];
  lineKeys: Set<string>;
 }
 interface OmpSubagentCardState {
  items: Map<number, OmpSubagentCardItem>;
  emitToolCall: (toolCallId: string) => boolean;
  lastEmitMs: number | null;
  trailingTimer: OmpSubagentCardTimer | null;
  dirty: boolean;
 }
 const MAX_LOG_LINES_PER_ITEM = 200;
 const MAX_LOG_LINE_CHARS = 240;
 const THROTTLE_INTERVAL_MS = 500;
 export function createOmpSubagentCardScheduler(): OmpSubagentCardScheduler {
  return {
    now: () => Date.now(),
    setTimeout: (callback, delayMs) => ({ token: setTimeout(callback, delayMs) }),
    clearTimeout: (timer) => {
      clearTimeout(timer.token as ReturnType<typeof setTimeout>);
    },
  };
 }
 /**
 * Fills a task card's description and child session from OMP's sub-agent events. The card is a
 * launch marker that names the task's first child; the children's activity belongs to their own
 * timelines.
 */
 export class OmpSubagentCardTracker {
-  private readonly scheduler: OmpSubagentCardScheduler;
+  private readonly firstChildren = new Map<string, OmpSubagentCardChild>();
  private readonly emitToolCall: (toolCallId: string) => boolean;
  private readonly states = new Map<string, OmpSubagentCardState>();
  constructor(options: OmpSubagentCardTrackerOptions) {
    this.scheduler = options.scheduler ?? createOmpSubagentCardScheduler();
    this.emitToolCall = options.emitToolCall ?? (() => false);
  }
  handleLifecycle(
    payload: OmpSubagentLifecyclePayload,
-    emitToolCall: (toolCallId: string) => boolean = this.emitToolCall,
+    emitToolCall: (toolCallId: string) => boolean,
  ): void {
-    const parentToolCallId = readTrimmedString(payload.parentToolCallId);
+    this.update(
-    if (!parentToolCallId) {
+      payload.parentToolCallId,
-      return;
+      {
    }
    this.stateFor(parentToolCallId).emitToolCall = emitToolCall;
    const item = this.upsertItem(parentToolCallId, {
        index: payload.index,
      agent: payload.agent,
        description: payload.description,
      status: payload.status === "started" ? "running" : payload.status,
        childSessionId: payload.sessionFile,
-    });
+      },
-    this.appendLine(
+      emitToolCall,
      item,
      `lifecycle:${payload.status}:${payload.id}`,
      `${payload.id} ${payload.status}`,
    );
    this.requestEmit(parentToolCallId);
  }
  handleProgress(
    payload: OmpSubagentProgressPayload,
-    emitToolCall: (toolCallId: string) => boolean = this.emitToolCall,
+    emitToolCall: (toolCallId: string) => boolean,
  ): void {
-    const parentToolCallId = readTrimmedString(payload.parentToolCallId);
+    this.update(
-    if (!parentToolCallId) {
+      payload.parentToolCallId,
-      return;
+      {
    }
    this.stateFor(parentToolCallId).emitToolCall = emitToolCall;
    const item = this.upsertItem(parentToolCallId, {
        index: payload.index,
      agent: payload.agent,
        description: payload.progress.description,
      status: payload.progress.status,
        childSessionId: payload.sessionFile,
-    });
+      },
-
+      emitToolCall,
    const currentToolLine = summarizeTool(readRecord(payload.progress.currentTool));
    if (currentToolLine) {
      this.appendLine(item, `current:${currentToolLine.key}`, currentToolLine.text);
    }
    for (const tool of readRecordArray(payload.progress.recentTools)) {
      const line = summarizeTool(tool);
      if (line) {
        this.appendLine(item, `tool:${line.key}`, line.text);
      }
    }
    for (const output of readOutputLines(payload.progress.recentOutput)) {
      this.appendLine(item, `output:${output}`, output);
    }
    if (payload.progress.status !== "running") {
      this.appendLine(
        item,
        `status:${payload.progress.status}:${payload.progress.id}`,
        `${payload.progress.id} ${payload.progress.status}`,
    );
  }
    this.requestEmit(parentToolCallId);
  }
  detailFor(toolCallId: string, baseDetail: ToolCallDetail): ToolCallDetail {
    if (baseDetail.type !== "sub_agent") {
      return baseDetail;
    }
-    const state = this.states.get(toolCallId);
+    const first = this.firstChildren.get(toolCallId);
-    if (!state) {
+    if (!first) {
      return baseDetail;
    }
-    const items = [...state.items.values()].sort((left, right) => left.index - right.index);
+    const description = baseDetail.description ?? first.description;
-    const firstItem = items[0];
+    const childSessionId = first.childSessionId ?? baseDetail.childSessionId;
-    if (!firstItem) {
+    return {
-      return baseDetail;
+      ...baseDetail,
-    }
+      ...(description ? { description } : {}),
-
+      ...(childSessionId ? { childSessionId } : {}),
    const detail: ToolCallDetail = {
      type: "sub_agent",
      ...(baseDetail.subAgentType ? { subAgentType: baseDetail.subAgentType } : {}),
      ...((baseDetail.description ?? firstItem.description)
        ? { description: baseDetail.description ?? firstItem.description }
        : {}),
      ...((firstItem.childSessionId ?? baseDetail.childSessionId)
        ? { childSessionId: firstItem.childSessionId ?? baseDetail.childSessionId }
        : {}),
      log: buildLog(items, baseDetail.log),
    };
    return baseDetail.actions ? { ...detail, actions: baseDetail.actions } : detail;
  }
  flush(toolCallId: string): void {
    const state = this.states.get(toolCallId);
    if (!state || !state.dirty) {
      return;
    }
    this.emitNow(toolCallId, state);
  }
  delete(toolCallId: string): void {
-    const state = this.states.get(toolCallId);
+    this.firstChildren.delete(toolCallId);
    if (state?.trailingTimer) {
      this.scheduler.clearTimeout(state.trailingTimer);
    }
    this.states.delete(toolCallId);
  }
  clear(): void {
-    for (const toolCallId of this.states.keys()) {
+    this.firstChildren.clear();
      this.delete(toolCallId);
    }
  }
-  private upsertItem(
+  private update(
-    parentToolCallId: string,
+    parentToolCallId: string | undefined,
-    input: {
+    input: { index: number; description?: string; childSessionId?: string },
-      index: number;
+    emitToolCall: (toolCallId: string) => boolean,
-      agent?: string;
+  ): void {
-      status?: "pending" | "running" | "completed" | "failed" | "aborted";
+    const toolCallId = readTrimmedString(parentToolCallId);
-      description?: string;
+    if (!toolCallId) {
-      childSessionId?: string;
+      return;
    },
  ): OmpSubagentCardItem {
    const state = this.stateFor(parentToolCallId);
    const existing = state.items.get(input.index);
    if (existing) {
      existing.agent = readTrimmedString(input.agent) ?? existing.agent;
      existing.status = input.status ?? existing.status;
      existing.description = readTrimmedString(input.description) ?? existing.description;
      existing.childSessionId = readTrimmedString(input.childSessionId) ?? existing.childSessionId;
      return existing;
    }
-
+    const first = this.firstChildren.get(toolCallId);
-    const item: OmpSubagentCardItem = {
+    if (first && input.index > first.index) {
      return;
    }
    const existing = first?.index === input.index ? first : undefined;
    const next: OmpSubagentCardChild = {
      index: input.index,
-      lines: [],
+      description: readTrimmedString(input.description) ?? existing?.description,
-      lineKeys: new Set<string>(),
+      childSessionId: readTrimmedString(input.childSessionId) ?? existing?.childSessionId,
      ...(readTrimmedString(input.agent) ? { agent: readTrimmedString(input.agent) } : {}),
      ...(input.status ? { status: input.status } : {}),
      ...(readTrimmedString(input.description)
        ? { description: readTrimmedString(input.description) }
        : {}),
      ...(readTrimmedString(input.childSessionId)
        ? { childSessionId: readTrimmedString(input.childSessionId) }
        : {}),
    };
-    state.items.set(input.index, item);
+    if (
-    return item;
+      existing &&
-  }
+      existing.description === next.description &&
-
+      existing.childSessionId === next.childSessionId
-  private stateFor(parentToolCallId: string): OmpSubagentCardState {
+    ) {
    const existing = this.states.get(parentToolCallId);
    if (existing) {
      return existing;
    }
    const state: OmpSubagentCardState = {
      items: new Map(),
      emitToolCall: this.emitToolCall,
      lastEmitMs: null,
      trailingTimer: null,
      dirty: false,
    };
    this.states.set(parentToolCallId, state);
    return state;
  }
  private appendLine(item: OmpSubagentCardItem, key: string, text: string): void {
    const normalizedText = normalizeLine(text);
    if (!normalizedText || item.lineKeys.has(key)) {
      return;
    }
-    item.lines.push({ key, text: normalizedText });
+    this.firstChildren.set(toolCallId, next);
-    item.lineKeys.add(key);
+    emitToolCall(toolCallId);
    while (item.lines.length > MAX_LOG_LINES_PER_ITEM) {
      const removed = item.lines.shift();
      if (removed) {
        item.lineKeys.delete(removed.key);
  }
 }
  }
  private requestEmit(toolCallId: string): void {
    const state = this.stateFor(toolCallId);
    const now = this.scheduler.now();
    const elapsedMs = state.lastEmitMs === null ? THROTTLE_INTERVAL_MS : now - state.lastEmitMs;
    if (elapsedMs >= THROTTLE_INTERVAL_MS) {
      this.emitNow(toolCallId, state);
      return;
    }
    state.dirty = true;
    if (state.trailingTimer) {
      return;
    }
    state.trailingTimer = this.scheduler.setTimeout(() => {
      state.trailingTimer = null;
      if (state.dirty) {
        this.emitNow(toolCallId, state);
      }
    }, THROTTLE_INTERVAL_MS - elapsedMs);
  }
  private emitNow(toolCallId: string, state: OmpSubagentCardState): void {
    if (state.trailingTimer) {
      this.scheduler.clearTimeout(state.trailingTimer);
      state.trailingTimer = null;
    }
    state.dirty = false;
    state.lastEmitMs = this.scheduler.now();
    state.emitToolCall(toolCallId);
  }
 }
 function buildLog(items: OmpSubagentCardItem[], fallback: string): string {
  const itemCount = Math.max(...items.map((item) => item.index)) + 1;
  const lines = items.flatMap((item) => {
    const prefix = itemCount > 1 ? `[${item.index + 1}/${itemCount}] ` : "";
    return item.lines.map((line) => `${prefix}${line.text}`);
  });
  return lines.length > 0 ? lines.join("\n") : fallback;
 }
 function summarizeTool(tool: Record<string, unknown> | null): OmpSubagentLogLine | null {
  if (!tool) {
    return null;
  }
  const toolName = readTrimmedString(tool.tool) ?? readTrimmedString(tool.name);
  if (!toolName) {
    return null;
  }
  const args = readTrimmedString(tool.args) ?? summarizeUnknown(tool.input);
  const endMs = typeof tool.endMs === "number" ? `:${tool.endMs}` : "";
  return {
    key: `${toolName}:${args ?? ""}${endMs}`,
    text: args ? `[${toolName}] ${args}` : `[${toolName}]`,
  };
 }
 function readOutputLines(value: unknown): string[] {
  if (!Array.isArray(value)) {
    return [];
  }
  return value.flatMap((item) => {
    const text =
      readTrimmedString(item) ??
      (isRecord(item)
        ? (readTrimmedString(item.text) ??
          readTrimmedString(item.output) ??
          readTrimmedString(item.content))
        : undefined);
    return text ? [text] : [];
  });
 }
 function readRecord(value: unknown): Record<string, unknown> | null {
  return isRecord(value) ? value : null;
 }
 function readRecordArray(value: unknown): Record<string, unknown>[] {
  return Array.isArray(value) ? value.filter(isRecord) : [];
 }
 function summarizeUnknown(value: unknown): string | undefined {
  if (value === undefined || value === null) {
    return undefined;
  }
  if (typeof value === "string") {
    return readTrimmedString(value);
  }
  const json = JSON.stringify(value);
  return typeof json === "string" ? normalizeLine(json) : undefined;
 }
 function normalizeLine(value: string): string | undefined {
  const normalized = value.trim().replace(/\s+/g, " ");
  if (!normalized) {
    return undefined;
  }
  if (normalized.length <= MAX_LOG_LINE_CHARS) {
    return normalized;
  }
  return `${normalized.slice(0, MAX_LOG_LINE_CHARS)}...`;
 }
 function readTrimmedString(value: unknown): string | undefined {
  return typeof value === "string" && value.trim().length > 0 ? value.trim() : undefined;
 }
 function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === "object" && value !== null && !Array.isArray(value);
 }
@@ -85,7 +85,7 @@ describe("OMP tool call mapper", () => {
    expect(mapOmpToolDetail(parseToolArgs("todo", { op: "view" }), null)).toBeNull();
  });
-  test("uses task result text and transcript path as the best static replay detail", () => {
+  test("takes the child session from the task transcript path", () => {
    expect(
      mapOmpToolDetail(
        parseToolArgs("task", {
@@ -106,7 +106,7 @@ describe("OMP tool call mapper", () => {
      subAgentType: "explore",
      description: "Inspect the target files",
      childSessionId: "/tmp/omp-task-static/Explore.jsonl",
-      log: "done\ntranscript: /tmp/omp-task-static/Explore.jsonl",
+      log: "",
    });
  });
@@ -179,7 +179,6 @@ const OPAQUE_TEXT_TOOLS = new Set([
 function mapOmpTaskDetail(args: unknown, result: OmpToolResult): ToolCallDetail {
  const argRecord = isRecord(args) ? args : {};
  const firstTask = Array.isArray(argRecord.tasks) ? argRecord.tasks.find(isRecord) : undefined;
  const resultText = extractTextFromToolResult(result);
  const childSessionId = readChildSessionId(result);
  return {
    type: "sub_agent",
@@ -200,7 +199,8 @@ function mapOmpTaskDetail(args: unknown, result: OmpToolResult): ToolCallDetail
      argRecord.assignment,
    ),
    ...(childSessionId ? { childSessionId } : {}),
-    log: resultText?.trim() ?? "",
+    // COMPAT(subagent-log): remove after 2027-04-30.
    log: "",
  };
 }
@@ -4846,15 +4846,6 @@ class OpenCodeAgentSession implements AgentSession {
            ...item,
            status: "failed",
            error,
            detail:
              item.detail.type === "sub_agent"
                ? {
                    ...item.detail,
                    log: [item.detail.log, error.message]
                      .filter((entry) => entry.trim().length > 0)
                      .join("\n"),
                  }
                : item.detail,
          },
        },
        turnId,
@@ -153,21 +153,6 @@ const OpencodeGrepOutputSchema = z
  ])
  .nullable();
 function formatLogEntry(value: unknown): string | undefined {
  const outputText = readOutputText(value);
  if (outputText) {
    return outputText;
  }
  if (value === null || value === undefined) {
    return undefined;
  }
  try {
    return JSON.stringify(value, null, 2);
  } catch {
    return String(value);
  }
 }
 function extractOpenCodeTaskSessionId(value: unknown): string | undefined {
  const text = readOutputText(value);
  if (text) {
@@ -195,7 +180,6 @@ function extractOpenCodeTaskSessionId(value: unknown): string | undefined {
 function deriveOpencodeTaskDetail(
  input: unknown,
  output: unknown,
  error: unknown,
  metadata: Record<string, unknown> | undefined,
 ): ToolCallDetail | null {
  if (!isRecord(input)) {
@@ -208,7 +192,6 @@ function deriveOpencodeTaskDetail(
    return null;
  }
  const log = [formatLogEntry(output), formatLogEntry(error)].filter((entry) => entry).join("\n");
  const childSessionId =
    normalizeSubAgentText(metadata?.sessionId) ?? extractOpenCodeTaskSessionId(output);
  return {
@@ -216,7 +199,8 @@ function deriveOpencodeTaskDetail(
    ...(subAgentType ? { subAgentType } : {}),
    ...(description ? { description } : {}),
    ...(childSessionId ? { childSessionId } : {}),
-    log,
+    // COMPAT(subagent-log): remove after 2027-04-30.
    log: "",
    actions: [],
  };
 }
@@ -373,11 +357,10 @@ export function deriveOpencodeToolDetail(
  toolName: string,
  input: unknown,
  output: unknown,
  error: unknown = null,
  metadata?: Record<string, unknown>,
 ): ToolCallDetail {
  if (toolName.trim().toLowerCase() === "task") {
-    const taskDetail = deriveOpencodeTaskDetail(input, output, error, metadata);
+    const taskDetail = deriveOpencodeTaskDetail(input, output, metadata);
    if (taskDetail) {
      return taskDetail;
    }
@@ -460,7 +460,7 @@ describe("opencode tool-call mapper", () => {
    });
  });
-  it("maps completed task calls with final output log to sub_agent detail", () => {
+  it("maps completed task calls to sub_agent detail", () => {
    const item = expectMapped(
      mapOpencodeToolCall({
        toolName: "task",
@@ -480,7 +480,7 @@ describe("opencode tool-call mapper", () => {
      type: "sub_agent",
      subAgentType: "explore",
      description: "Explore agent-tools codebase",
-      log: "Found the CLI entrypoint and provider registry.",
+      log: "",
      actions: [],
    });
  });
@@ -505,12 +505,12 @@ describe("opencode tool-call mapper", () => {
      subAgentType: "explore",
      description: "Explore current directory",
      childSessionId: "ses_2268db431ffe299vL1bbot8R7Z",
-      log: '<task id="ses_2268db431ffe299vL1bbot8R7Z">done</task>',
+      log: "",
      actions: [],
    });
  });
-  it("maps aborted task calls with preserved error log to sub_agent detail", () => {
+  it("maps aborted task calls to sub_agent detail", () => {
    const item = expectMapped(
      mapOpencodeToolCall({
        toolName: "task",
@@ -531,7 +531,7 @@ describe("opencode tool-call mapper", () => {
      type: "sub_agent",
      subAgentType: "explore",
      description: "Explore agent-tools codebase",
-      log: "Tool execution aborted",
+      log: "",
      actions: [],
    });
  });
@@ -43,7 +43,7 @@ export function mapOpencodeToolCall(params: OpencodeToolCallParams): ToolCallTim
  const error = raw.error ?? null;
  const rawStatus = typeof raw.status === "string" ? raw.status : undefined;
  const status = normalizeToolCallStatus(rawStatus, error, output);
-  const detail = deriveOpencodeToolDetail(name, input, output, error, raw.metadata);
+  const detail = deriveOpencodeToolDetail(name, input, output, raw.metadata);
  if (status === "failed") {
    return {
@@ -1,5 +1,4 @@
 import { z } from "zod";
 import { extractTextFromToolResult } from "../../tool-call-mapper.js";
 import type { PiChildSessionFile, PiExtension } from "../contract.js";
 import type { ProviderSubagentInputEvent } from "../../../../provider-subagents/store.js";
@@ -99,7 +98,8 @@ export const edxethPiSubagents: PiExtension = {
          detail: {
            type: "sub_agent",
            description,
-            log: extractTextFromToolResult(call.result)?.trim() ?? "",
+            // COMPAT(subagent-log): remove after 2027-04-30.
            log: "",
          },
          subagents,
          childSessions,
@@ -130,6 +130,18 @@ describe("@gotgenes/pi-subagents adapter", () => {
        .filter((event) => event.event.type === "upsert")
        .map((event) => (event.event.type === "upsert" ? event.event.status : null)),
    ).toEqual(["running", "completed"]);
    expect(
      events.flatMap((event) => (event.event.type === "timeline" ? [event.event] : [])),
    ).toEqual([
      {
        type: "timeline",
        id: "call_502323",
        item: {
          type: "assistant_message",
          text: "Agent completed in 4.7s (1 tool uses, 9.0k token).\nAgent ID: 848583f5-6749-4a1\n\nThe workspace is empty.",
        },
      },
    ]);
  });
  test("correlates a background notification and result collection", async () => {
    const source = readSubagentFixture(new URL("./fixtures/background.json", import.meta.url));
@@ -64,7 +64,8 @@ export const gotgenesPiSubagents: PiExtension = {
        type: "sub_agent" as const,
        subAgentType: title,
        description,
-        log: extractTextFromToolResult(call.result)?.trim() ?? "",
+        // COMPAT(subagent-log): remove after 2027-04-30.
        log: "",
      };
      if (call.status === "running")
        return {
@@ -92,6 +93,10 @@ export const gotgenesPiSubagents: PiExtension = {
        outputFileFromToolResult(call.result) ?? pendingFilesByAgent.get(details.data.agentId);
      pendingFilesByAgent.delete(details.data.agentId);
      const childSessions = childSession(call.callId, file);
      const childStatus = status(details.data.status);
      // Without a session file, as on replay, the child's answer is the tool result.
      const answer =
        !file && childStatus !== "running" ? extractTextFromToolResult(call.result)?.trim() : "";
      return {
        detail,
        subagents: [
@@ -101,8 +106,17 @@ export const gotgenesPiSubagents: PiExtension = {
            title,
            description,
            toolCallId: call.callId,
-            status: status(details.data.status),
+            status: childStatus,
          },
          ...(answer
            ? [
                {
                  type: "timeline" as const,
                  id: call.callId,
                  item: { type: "assistant_message" as const, text: answer },
                },
              ]
            : []),
        ],
        childSessions,
      };
@@ -118,7 +132,8 @@ export const gotgenesPiSubagents: PiExtension = {
      const detail = {
        type: "sub_agent" as const,
        description: details.success ? details.data.description : undefined,
-        log: extractTextFromToolResult(call.result)?.trim() ?? "",
+        // COMPAT(subagent-log): remove after 2027-04-30.
        log: "",
      };
      if (call.status === "running" || !details.success) return { detail };
      const file = details.data.transcriptPath;
@@ -210,7 +210,7 @@ describe("Pi extension host", () => {
          type: "sub_agent",
          subAgentType: "scout",
          description: "Inspect files",
-          log: "Found two files",
+          log: "",
        },
      }),
    );
@@ -137,7 +137,7 @@ describe("pi-subagents adapter", () => {
      type: "sub_agent",
      subAgentType: "reviewer",
      description: "Review the Pi mapper change",
-      log: "The mapper change preserves provider status.",
+      log: "",
    });
  });
@@ -131,7 +131,8 @@ export const piSubagents: PiExtension = {
        type: "sub_agent" as const,
        subAgentType: args.data.agent,
        description: args.data.task,
-        log: extractTextFromToolResult(call.result)?.trim() ?? "",
+        // COMPAT(subagent-log): remove after 2027-04-30.
        log: "",
      };
      const base = {
        type: "upsert" as const,
@@ -54,8 +54,6 @@ export async function verifySubagentFixture(
  try {
    await session.startTurn("Delegate work");
    for (const event of fixture.events) pi.latestSession().emit(event);
    const immediate = live.filter((event) => event.type === "provider_subagent");
    expect(immediate.some((event) => event.event.type === "timeline")).toBe(false);
    pi.latestSession().finishTurn();
    const replay: AgentStreamEvent[] = [];
    for await (const event of streamPiHistory("pi", fixture.messages)) replay.push(event);
@@ -36,12 +36,17 @@ describe("@tintinweb/pi-subagents adapter", () => {
    });
    expect(mapping?.subagents).toEqual([
      expect.objectContaining({ id: "call-1", status: "completed" }),
      {
        type: "timeline",
        id: "call-1",
        item: { type: "assistant_message", text: "Wrapped up (turn limit)" },
      },
    ]);
    expect(mapping?.detail).toEqual({
      type: "sub_agent",
      subAgentType: "Explore",
      description: "Inspect",
-      log: "Wrapped up (turn limit)",
+      log: "",
    });
  });
  test("maps captured foreground lifecycle live and on replay", async () => {
@@ -53,6 +58,18 @@ describe("@tintinweb/pi-subagents adapter", () => {
        .filter((event) => event.event.type === "upsert")
        .map((event) => (event.event.type === "upsert" ? event.event.status : null)),
    ).toEqual(["running", "completed"]);
    expect(
      events.flatMap((event) => (event.event.type === "timeline" ? [event.event] : [])),
    ).toEqual([
      {
        type: "timeline",
        id: "call_458926",
        item: {
          type: "assistant_message",
          text: "Agent completed in 6.6s (1 tool uses, 18.8k token).\n\nThe workspace directory `/tmp/paseo-pi-extension-phase3/workspace` is empty (no files or hidden dotfiles).",
        },
      },
    ]);
  });
  test("uses a structured notification to complete a background child", async () => {
    const source = readSubagentFixture(new URL("./fixtures/background.json", import.meta.url));
@@ -147,7 +164,7 @@ describe("@tintinweb/pi-subagents adapter", () => {
      expect(mapping?.detail).toEqual({
        type: "sub_agent",
        description: undefined,
-        log: "Wrapped up (turn limit)",
+        log: "",
      });
    },
  );
@@ -57,7 +57,8 @@ export const tintinwebPiSubagents: PiExtension = {
        type: "sub_agent" as const,
        subAgentType: title,
        description,
-        log: extractTextFromToolResult(call.result)?.trim() ?? "",
+        // COMPAT(subagent-log): remove after 2027-04-30.
        log: "",
      };
      if (call.status === "running")
        return {
@@ -84,6 +85,10 @@ export const tintinwebPiSubagents: PiExtension = {
      const file = outputFileFromToolResult(call.result);
      const childSessions = file && !readSessions.has(file) ? [{ id: call.callId, file }] : [];
      if (file) readSessions.add(file);
      const childStatus = status(details.data.status);
      // A foreground child has no session file; its answer is the tool result.
      const answer =
        !file && childStatus !== "running" ? extractTextFromToolResult(call.result)?.trim() : "";
      return {
        detail,
        subagents: [
@@ -93,8 +98,17 @@ export const tintinwebPiSubagents: PiExtension = {
            title,
            description,
            toolCallId: call.callId,
-            status: status(details.data.status),
+            status: childStatus,
          },
          ...(answer
            ? [
                {
                  type: "timeline" as const,
                  id: call.callId,
                  item: { type: "assistant_message" as const, text: answer },
                },
              ]
            : []),
        ],
        childSessions,
      };
@@ -110,7 +124,8 @@ export const tintinwebPiSubagents: PiExtension = {
      const detail = {
        type: "sub_agent" as const,
        description: details.success ? details.data.description : undefined,
-        log: extractTextFromToolResult(call.result)?.trim() ?? "",
+        // COMPAT(subagent-log): remove after 2027-04-30.
        log: "",
      };
      if (call.status === "running" || !details.success) return { detail };
      return {
@@ -1,6 +1,3 @@
 import { execFile } from "node:child_process";
 import { promisify } from "node:util";
 import { fileURLToPath } from "node:url";
 import { mkdtempSync, rmSync } from "node:fs";
 import { tmpdir } from "node:os";
 import path from "node:path";
@@ -10,7 +7,7 @@ import { ClaudeAgentClient } from "../agent/providers/claude/agent.js";
 import { createTestPaseoDaemon } from "../test-utils/paseo-daemon.js";
 import { DaemonClient } from "../test-utils/daemon-client.js";
-test("background cards retain child actions after the parent finishes (#6253)", async () => {
+test("background children keep their actions after the parent finishes (#6253)", async () => {
  const cwd = mkdtempSync(path.join(tmpdir(), "paseo-background-card-"));
  const logger = pino({ level: "silent" });
  const daemon = await createTestPaseoDaemon({
@@ -62,22 +59,6 @@ test("background cards retain child actions after the parent finishes (#6253)",
      limit: 0,
      projection: "projected",
    });
    const { stdout } = await promisify(execFile)(
      process.execPath,
      [
        "--conditions=source",
        "--import",
        "tsx",
        fileURLToPath(new URL("../../../../cli/src/index.ts", import.meta.url)),
        "--host",
        `127.0.0.1:${daemon.port}`,
        "logs",
        agent.id,
      ],
      { env: { ...process.env, PASEO_HOME: daemon.paseoHome }, timeout: 30_000 },
    );
    expect(stdout).toContain("[Bash] ls -1");
    expect(stdout).toContain("[Bash] pwd");
    expect(
      atFinish.entries.filter(
        (row) => row.item.type === "tool_call" && row.item.detail?.type === "sub_agent",
@@ -94,9 +75,6 @@ test("background cards retain child actions after the parent finishes (#6253)",
        ),
      ).toBe(true);
    }
    for (const card of cards) {
      expect(card.detail?.type === "sub_agent" ? card.detail.log : "").toContain("[Bash]");
    }
  } finally {
    await client.close();
    await daemon.close();
Author	SHA1	Message	Date
Mohamed Boudra	bce306238b	fix(server): keep a gotgenes foreground answer on replay A foreground @gotgenes/pi-subagents child finds its session file only through the live runtime marker, which history does not keep. Without a file, emit the spawn result text as the child's assistant message.	2026-10-30 12:01:23 +01:00
Mohamed Boudra	c1bcfd930b	fix(server): settle child compactions and keep sub-agent cards stable - Codex: a child compaction shown as loading now completes on the child's thread/compacted or turn end, once. - Claude: a streamed child tool call's empty start input is a placeholder, so the assistant message's input reaches its card. - OMP: the task card follows only its first child, so later children no longer re-send an unchanged card.	2026-10-30 11:47:33 +01:00
Mohamed Boudra	6953ba6506	fix(server): put a tintinweb foreground answer in the child timeline A foreground @tintinweb/pi-subagents child has no session file, so its answer only exists in the Agent tool result. Emit that text as the child's assistant message when the child finishes. Tag every sub_agent producer's `log: ""` with COMPAT(subagent-log) so the shim removal finds them.	2026-10-30 09:49:51 +01:00
Mohamed Boudra	a68a0c2c5f	fix: make sub-agent cards launch markers Sub-agent tool calls no longer accumulate the child's activity into `log`. Claude, Codex, OpenCode, OMP and Pi emit the card when the child starts and when its label or status changes; the child's messages and tool calls stay in the sub-agent's own timeline. The app no longer renders a sub-agent log. The wire schema makes `log` optional. Daemons still send `log: ""` so apps that require the field keep parsing the card.	2026-10-30 08:35:04 +01:00