diff --git a/src/agents/openclaw-tools.sessions.test.ts b/src/agents/openclaw-tools.sessions.test.ts
index 172a944e859..7e92397e179 100644
--- a/src/agents/openclaw-tools.sessions.test.ts
+++ b/src/agents/openclaw-tools.sessions.test.ts
@@ -844,6 +844,16 @@ describe("sessions tools", () => {
       createdAt: now - 2 * 60_000,
       startedAt: now - 2 * 60_000,
     });
+    addSubagentRunForTests({
+      runId: "run-child",
+      childSessionKey: "agent:main:subagent:active:subagent:child",
+      requesterSessionKey: "agent:main:subagent:active",
+      requesterDisplayKey: "subagent:active",
+      task: "child worker",
+      cleanup: "keep",
+      createdAt: now - 60_000,
+      startedAt: now - 60_000,
+    });
     addSubagentRunForTests({
       runId: "run-recent",
       childSessionKey: "agent:main:subagent:recent",
@@ -880,12 +890,16 @@ describe("sessions tools", () => {
     const result = await tool.execute("call-subagents-list", { action: "list" });
     const details = result.details as {
       status?: string;
-      active?: unknown[];
+      active?: Array<{ runId?: string; childSessions?: string[] }>;
       recent?: unknown[];
       text?: string;
     };
     expect(details.status).toBe("ok");
     expect(details.active).toHaveLength(1);
+    expect(details.active?.[0]).toMatchObject({
+      runId: "run-active",
+      childSessions: ["agent:main:subagent:active:subagent:child"],
+    });
     expect(details.recent).toHaveLength(1);
     expect(details.text).toContain("active subagents:");
     expect(details.text).toContain("recent (last 30m):");
diff --git a/src/agents/subagent-control.ts b/src/agents/subagent-control.ts
index 528a84eebd3..6fe96e11b6e 100644
--- a/src/agents/subagent-control.ts
+++ b/src/agents/subagent-control.ts
@@ -73,6 +73,7 @@ export type SubagentListItem = {
   pendingDescendants: number;
   runtime: string;
   runtimeMs: number;
+  childSessions?: string[];
   model?: string;
   totalTokens?: number;
   startedAt?: number;
@@ -273,6 +274,11 @@ export function buildSubagentList(params: {
     const status = resolveRunStatus(entry, {
       pendingDescendants,
     });
+    const childSessions = Array.from(
+      new Set(
+        listSubagentRunsForController(entry.childSessionKey).map((run) => run.childSessionKey),
+      ),
+    );
     const runtime = formatDurationCompact(runtimeMs);
     const label = truncateLine(resolveSubagentLabel(entry), 48);
     const task = truncateLine(entry.task.trim(), params.taskMaxChars ?? 72);
@@ -288,6 +294,7 @@ export function buildSubagentList(params: {
       pendingDescendants,
       runtime,
       runtimeMs,
+      ...(childSessions.length > 0 ? { childSessions } : {}),
       model: resolveModelRef(sessionEntry) || entry.model,
       totalTokens,
       startedAt: entry.startedAt,