diff --git a/src/agents/subagent-registry.announce-loop-guard.test.ts b/src/agents/subagent-registry.announce-loop-guard.test.ts
index 5a2bfb2dbec..8389c53503c 100644
--- a/src/agents/subagent-registry.announce-loop-guard.test.ts
+++ b/src/agents/subagent-registry.announce-loop-guard.test.ts
@@ -16,7 +16,11 @@ vi.mock("../config/config.js", () => ({
 }));
 
 vi.mock("../config/sessions.js", () => ({
-  loadSessionStore: () => ({}),
+  loadSessionStore: () => ({
+    "agent:main:subagent:child-1": { sessionId: "sess-child-1", updatedAt: 1 },
+    "agent:main:subagent:expired-child": { sessionId: "sess-expired", updatedAt: 1 },
+    "agent:main:subagent:retry-budget": { sessionId: "sess-retry", updatedAt: 1 },
+  }),
   resolveAgentIdFromSessionKey: (key: string) => {
     const match = key.match(/^agent:([^:]+)/);
     return match?.[1] ?? "main";
diff --git a/src/agents/subagent-registry.persistence.test.ts b/src/agents/subagent-registry.persistence.test.ts
index 9ef2458e35c..5558d77785e 100644
--- a/src/agents/subagent-registry.persistence.test.ts
+++ b/src/agents/subagent-registry.persistence.test.ts
@@ -5,7 +5,10 @@ import { afterEach, describe, expect, it, vi } from "vitest";
 import "./subagent-registry.mocks.shared.js";
 import { captureEnv } from "../test-utils/env.js";
 import {
+  addSubagentRunForTests,
+  clearSubagentRunSteerRestart,
   initSubagentRegistry,
+  listSubagentRunsForRequester,
   registerSubagentRun,
   resetSubagentRegistryForTests,
 } from "./subagent-registry.js";
@@ -22,12 +25,93 @@ describe("subagent registry persistence", () => {
   const envSnapshot = captureEnv(["OPENCLAW_STATE_DIR"]);
   let tempStateDir: string | null = null;
 
-  const writePersistedRegistry = async (persisted: Record<string, unknown>) => {
+  const resolveAgentIdFromSessionKey = (sessionKey: string) => {
+    const match = sessionKey.match(/^agent:([^:]+):/i);
+    return (match?.[1] ?? "main").trim().toLowerCase() || "main";
+  };
+
+  const resolveSessionStorePath = (stateDir: string, agentId: string) =>
+    path.join(stateDir, "agents", agentId, "sessions", "sessions.json");
+
+  const readSessionStore = async (storePath: string) => {
+    try {
+      const raw = await fs.readFile(storePath, "utf8");
+      const parsed = JSON.parse(raw) as unknown;
+      if (parsed && typeof parsed === "object" && !Array.isArray(parsed)) {
+        return parsed as Record<string, Record<string, unknown>>;
+      }
+    } catch {
+      // ignore
+    }
+    return {} as Record<string, Record<string, unknown>>;
+  };
+
+  const writeChildSessionEntry = async (params: {
+    sessionKey: string;
+    sessionId?: string;
+    updatedAt?: number;
+  }) => {
+    if (!tempStateDir) {
+      throw new Error("tempStateDir not initialized");
+    }
+    const agentId = resolveAgentIdFromSessionKey(params.sessionKey);
+    const storePath = resolveSessionStorePath(tempStateDir, agentId);
+    const store = await readSessionStore(storePath);
+    store[params.sessionKey] = {
+      ...(store[params.sessionKey] ?? {}),
+      sessionId: params.sessionId ?? `sess-${agentId}-${Date.now()}`,
+      updatedAt: params.updatedAt ?? Date.now(),
+    };
+    await fs.mkdir(path.dirname(storePath), { recursive: true });
+    await fs.writeFile(storePath, `${JSON.stringify(store)}\n`, "utf8");
+    return storePath;
+  };
+
+  const removeChildSessionEntry = async (sessionKey: string) => {
+    if (!tempStateDir) {
+      throw new Error("tempStateDir not initialized");
+    }
+    const agentId = resolveAgentIdFromSessionKey(sessionKey);
+    const storePath = resolveSessionStorePath(tempStateDir, agentId);
+    const store = await readSessionStore(storePath);
+    delete store[sessionKey];
+    await fs.mkdir(path.dirname(storePath), { recursive: true });
+    await fs.writeFile(storePath, `${JSON.stringify(store)}\n`, "utf8");
+    return storePath;
+  };
+
+  const seedChildSessionsForPersistedRuns = async (persisted: Record<string, unknown>) => {
+    const runs = (persisted.runs ?? {}) as Record<
+      string,
+      {
+        runId?: string;
+        childSessionKey?: string;
+      }
+    >;
+    for (const [runId, run] of Object.entries(runs)) {
+      const childSessionKey = run?.childSessionKey?.trim();
+      if (!childSessionKey) {
+        continue;
+      }
+      await writeChildSessionEntry({
+        sessionKey: childSessionKey,
+        sessionId: `sess-${run.runId ?? runId}`,
+      });
+    }
+  };
+
+  const writePersistedRegistry = async (
+    persisted: Record<string, unknown>,
+    opts?: { seedChildSessions?: boolean },
+  ) => {
     tempStateDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-subagent-"));
     process.env.OPENCLAW_STATE_DIR = tempStateDir;
     const registryPath = path.join(tempStateDir, "subagents", "runs.json");
     await fs.mkdir(path.dirname(registryPath), { recursive: true });
     await fs.writeFile(registryPath, `${JSON.stringify(persisted)}\n`, "utf8");
+    if (opts?.seedChildSessions !== false) {
+      await seedChildSessionsForPersistedRuns(persisted);
+    }
     return registryPath;
   };
 
@@ -90,6 +174,10 @@ describe("subagent registry persistence", () => {
       task: "do the thing",
       cleanup: "keep",
     });
+    await writeChildSessionEntry({
+      sessionKey: "agent:main:subagent:test",
+      sessionId: "sess-test",
+    });
 
     const registryPath = path.join(tempStateDir, "subagents", "runs.json");
     const raw = await fs.readFile(registryPath, "utf8");
@@ -162,6 +250,10 @@ describe("subagent registry persistence", () => {
     };
     await fs.mkdir(path.dirname(registryPath), { recursive: true });
     await fs.writeFile(registryPath, `${JSON.stringify(persisted)}\n`, "utf8");
+    await writeChildSessionEntry({
+      sessionKey: "agent:main:subagent:two",
+      sessionId: "sess-two",
+    });
 
     resetSubagentRegistryForTests({ persist: false });
     initSubagentRegistry();
@@ -268,6 +360,64 @@ describe("subagent registry persistence", () => {
     expect(afterSecond.runs?.["run-4"]).toBeUndefined();
   });
 
+  it("reconciles orphaned restored runs by pruning them from registry", async () => {
+    const persisted = createPersistedEndedRun({
+      runId: "run-orphan-restore",
+      childSessionKey: "agent:main:subagent:ghost-restore",
+      task: "orphan restore",
+      cleanup: "keep",
+    });
+    const registryPath = await writePersistedRegistry(persisted, {
+      seedChildSessions: false,
+    });
+
+    await restartRegistryAndFlush();
+
+    expect(announceSpy).not.toHaveBeenCalled();
+    const after = JSON.parse(await fs.readFile(registryPath, "utf8")) as {
+      runs?: Record<string, unknown>;
+    };
+    expect(after.runs?.["run-orphan-restore"]).toBeUndefined();
+    expect(listSubagentRunsForRequester("agent:main:main")).toHaveLength(0);
+  });
+
+  it("resume guard prunes orphan runs before announce retry", async () => {
+    tempStateDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-subagent-"));
+    process.env.OPENCLAW_STATE_DIR = tempStateDir;
+    const runId = "run-orphan-resume-guard";
+    const childSessionKey = "agent:main:subagent:ghost-resume";
+    const now = Date.now();
+
+    await writeChildSessionEntry({
+      sessionKey: childSessionKey,
+      sessionId: "sess-resume-guard",
+      updatedAt: now,
+    });
+    addSubagentRunForTests({
+      runId,
+      childSessionKey,
+      requesterSessionKey: "agent:main:main",
+      requesterDisplayKey: "main",
+      task: "resume orphan guard",
+      cleanup: "keep",
+      createdAt: now - 50,
+      startedAt: now - 25,
+      endedAt: now,
+      suppressAnnounceReason: "steer-restart",
+      cleanupHandled: false,
+    });
+    await removeChildSessionEntry(childSessionKey);
+
+    const changed = clearSubagentRunSteerRestart(runId);
+    expect(changed).toBe(true);
+    await flushQueuedRegistryWork();
+
+    expect(announceSpy).not.toHaveBeenCalled();
+    expect(listSubagentRunsForRequester("agent:main:main")).toHaveLength(0);
+    const persisted = loadSubagentRegistryFromDisk();
+    expect(persisted.has(runId)).toBe(false);
+  });
+
   it("uses isolated temp state when OPENCLAW_STATE_DIR is unset in tests", async () => {
     delete process.env.OPENCLAW_STATE_DIR;
     vi.resetModules();
diff --git a/src/agents/subagent-registry.ts b/src/agents/subagent-registry.ts
index 8506b77d53e..edb8f228b07 100644
--- a/src/agents/subagent-registry.ts
+++ b/src/agents/subagent-registry.ts
@@ -1,4 +1,10 @@
 import { loadConfig } from "../config/config.js";
+import {
+  loadSessionStore,
+  resolveAgentIdFromSessionKey,
+  resolveStorePath,
+  type SessionEntry,
+} from "../config/sessions.js";
 import { callGateway } from "../gateway/call.js";
 import { onAgentEvent } from "../infra/agent-events.js";
 import { defaultRuntime } from "../runtime.js";
@@ -59,6 +65,7 @@ const MAX_ANNOUNCE_RETRY_COUNT = 3;
  * succeeded. Guards against stale registry entries surviving gateway restarts.
  */
 const ANNOUNCE_EXPIRY_MS = 5 * 60_000; // 5 minutes
+type SubagentRunOrphanReason = "missing-session-entry" | "missing-session-id";
 
 function resolveAnnounceRetryDelayMs(retryCount: number) {
   const boundedRetryCount = Math.max(0, Math.min(retryCount, 10));
@@ -82,6 +89,119 @@ function persistSubagentRuns() {
   persistSubagentRunsToDisk(subagentRuns);
 }
 
+function findSessionEntryByKey(store: Record<string, SessionEntry>, sessionKey: string) {
+  const direct = store[sessionKey];
+  if (direct) {
+    return direct;
+  }
+  const normalized = sessionKey.toLowerCase();
+  for (const [key, entry] of Object.entries(store)) {
+    if (key.toLowerCase() === normalized) {
+      return entry;
+    }
+  }
+  return undefined;
+}
+
+function resolveSubagentRunOrphanReason(params: {
+  entry: SubagentRunRecord;
+  storeCache?: Map<string, Record<string, SessionEntry>>;
+}): SubagentRunOrphanReason | null {
+  const childSessionKey = params.entry.childSessionKey?.trim();
+  if (!childSessionKey) {
+    return "missing-session-entry";
+  }
+  try {
+    const cfg = loadConfig();
+    const agentId = resolveAgentIdFromSessionKey(childSessionKey);
+    const storePath = resolveStorePath(cfg.session?.store, { agentId });
+    let store = params.storeCache?.get(storePath);
+    if (!store) {
+      store = loadSessionStore(storePath);
+      params.storeCache?.set(storePath, store);
+    }
+    const sessionEntry = findSessionEntryByKey(store, childSessionKey);
+    if (!sessionEntry) {
+      return "missing-session-entry";
+    }
+    if (typeof sessionEntry.sessionId !== "string" || !sessionEntry.sessionId.trim()) {
+      return "missing-session-id";
+    }
+    return null;
+  } catch {
+    // Best-effort guard: avoid false orphan pruning on transient read/config failures.
+    return null;
+  }
+}
+
+function reconcileOrphanedRun(params: {
+  runId: string;
+  entry: SubagentRunRecord;
+  reason: SubagentRunOrphanReason;
+  source: "restore" | "resume";
+}) {
+  const now = Date.now();
+  let changed = false;
+  if (typeof params.entry.endedAt !== "number") {
+    params.entry.endedAt = now;
+    changed = true;
+  }
+  const orphanOutcome: SubagentRunOutcome = {
+    status: "error",
+    error: `orphaned subagent run (${params.reason})`,
+  };
+  if (!runOutcomesEqual(params.entry.outcome, orphanOutcome)) {
+    params.entry.outcome = orphanOutcome;
+    changed = true;
+  }
+  if (params.entry.endedReason !== SUBAGENT_ENDED_REASON_ERROR) {
+    params.entry.endedReason = SUBAGENT_ENDED_REASON_ERROR;
+    changed = true;
+  }
+  if (params.entry.cleanupHandled !== true) {
+    params.entry.cleanupHandled = true;
+    changed = true;
+  }
+  if (typeof params.entry.cleanupCompletedAt !== "number") {
+    params.entry.cleanupCompletedAt = now;
+    changed = true;
+  }
+  const removed = subagentRuns.delete(params.runId);
+  resumedRuns.delete(params.runId);
+  if (!removed && !changed) {
+    return false;
+  }
+  defaultRuntime.log(
+    `[warn] Subagent orphan run pruned source=${params.source} run=${params.runId} child=${params.entry.childSessionKey} reason=${params.reason}`,
+  );
+  return true;
+}
+
+function reconcileOrphanedRestoredRuns() {
+  const storeCache = new Map<string, Record<string, SessionEntry>>();
+  let changed = false;
+  for (const [runId, entry] of subagentRuns.entries()) {
+    const orphanReason = resolveSubagentRunOrphanReason({
+      entry,
+      storeCache,
+    });
+    if (!orphanReason) {
+      continue;
+    }
+    if (
+      reconcileOrphanedRun({
+        runId,
+        entry,
+        reason: orphanReason,
+        source: "restore",
+      })
+    ) {
+      changed = true;
+    }
+  }
+  return changed;
+}
+
 const resumedRuns = new Set<string>();
 const endedHookInFlightRunIds = new Set<string>();
 
@@ -225,6 +345,20 @@ function resumeSubagentRun(runId: string) {
   if (!entry) {
     return;
   }
+  const orphanReason = resolveSubagentRunOrphanReason({ entry });
+  if (orphanReason) {
+    if (
+      reconcileOrphanedRun({
+        runId,
+        entry,
+        reason: orphanReason,
+        source: "resume",
+      })
+    ) {
+      persistSubagentRuns();
+    }
+    return;
+  }
   if (entry.cleanupCompletedAt) {
     return;
   }
@@ -290,6 +424,12 @@ function restoreSubagentRunsOnce() {
     if (restoredCount === 0) {
       return;
     }
+    if (reconcileOrphanedRestoredRuns()) {
+      persistSubagentRuns();
+    }
+    if (subagentRuns.size === 0) {
+      return;
+    }
     // Resume pending work.
     ensureListener();
     if ([...subagentRuns.values()].some((entry) => entry.archiveAtMs)) {