diff --git a/server/src/services/native-runtime/native-session-executor.test.ts b/server/src/services/native-runtime/native-session-executor.test.ts
index e03c1f8333..4bd3472ee3 100644
--- a/server/src/services/native-runtime/native-session-executor.test.ts
+++ b/server/src/services/native-runtime/native-session-executor.test.ts
@@ -28,6 +28,7 @@ import { inspect } from "node:util";
 import { join } from "node:path";
 import {
   heartbeatRuns,
+  environmentLeases,
   heartbeatRunEvents,
   issues,
   nativeRunFinalizations,
@@ -82,6 +83,9 @@ vi.mock("node:fs", async (importOriginal) => {
   return { ...actual, readFileSync: vi.fn(actual.readFileSync) };
 });
 
+const computerRetirement = vi.hoisted(() => ({ isRetired: vi.fn() }));
+vi.mock("../../modules/computers/index.js", () => ({ computerService: () => computerRetirement }));
+
 const githubAccess = vi.hoisted(() => ({
   activate: vi.fn((_binding: { runId: string }) => vi.fn()),
   stop: vi.fn(async () => undefined),
@@ -13438,6 +13442,65 @@ describe("runnerd provider runtime wiring", () => {
     } finally { await rm(root, { recursive: true, force: true }); }
   });
 
+  it.each([
+    { condition: "retired", expected: "verified" },
+    { condition: "uncertain", expected: "terminal_state_indeterminate" },
+    { condition: "stale-generation", expected: "terminal_state_indeterminate" },
+    { condition: "wrong-placement", expected: "scope_mismatch" },
+    { condition: "wrong-lease", expected: "scope_mismatch" },
+    { condition: "active-run", expected: "active" },
+    { condition: "unavailable", expected: "unavailable" },
+    { condition: "corrupt-local", expected: "terminal_state_indeterminate" },
+  ])("verifies remote idle retirement before a fresh same-session turn ($condition)", async ({ condition, expected }) => {
+    const root = await mkdtemp(join(tmpdir(), "paperclip-computer-idle-retirement-"));
+    const prior = execution;
+    const current = { ...execution, binding: { ...execution.binding, runId: "after-idle" } };
+    const owner = { computerId: "computer", ownerId: "retired-owner", generation: 2, listenerPort: 43127 };
+    const descriptor = { kind: "remote-persistent", leaseId: "prior-lease", providerLeaseId: owner.ownerId,
+      remoteCwd: "/remote/agent", computerId: owner.computerId, ownerGeneration: owner.generation,
+      listenerPort: owner.listenerPort, placementId: "placement" };
+    const db = { select: () => ({ from: (table: unknown) => ({ where: () => ({ limit: async () =>
+      table === environmentLeases ? condition === "wrong-lease" ? [] : [{
+        providerLeaseId: owner.ownerId,
+        metadata: { agentId: prior.binding.agentId, computerOwner: { ...owner, generation: 1 } },
+      }] : [{ status: condition === "active-run" ? "running" : "succeeded",
+        runnerProfileJson: { nativeExecutionInput: prior, nativeComputerWorkspace: descriptor } }],
+    }) }) }) } as unknown as Db;
+    computerRetirement.isRetired.mockReset().mockImplementation(async ({ owner: requested }) => {
+      if (condition === "unavailable") throw new Error("ledger unavailable");
+      return condition !== "uncertain" && requested.generation === (condition === "stale-generation" ? 3 : 2);
+    });
+    const input = { db, root, execution: current, identity: { runId: prior.binding.runId,
+      normalizedSessionId: prior.session.normalizedSessionId!, runnerInstanceId: "prior-runner",
+      environmentLeaseId: condition === "wrong-lease" ? "other-lease" : "initial-physical-lease" },
+      allowVerifiedBackup: false, remoteRunnerState: true,
+      runnerExecutionTarget: { kind: "remote", transport: "computer", environmentId: "environment",
+        remoteCwd: "/remote/agent", resourceAuthority: { ...owner, ownerId: "successor-owner", generation: 1 },
+        fileAuthority: { placementId: condition === "wrong-placement" ? "other-placement" : "placement" } } as never };
+    try {
+      if (condition === "corrupt-local") {
+        await mkdir(join(root, "runner"));
+        await writeFile(join(root, "runner", "runner-state.json"), "invalid state");
+      }
+      if (condition === "retired") {
+        // Both live warm handoffs use their retained owner. After idle expiry,
+        // the next turn must instead prove the exact generation was retired.
+        for (let turn = 0; turn < 2; turn += 1) {
+          expect(await verifyPriorRunnerdStateForSessionScope({ ...input, allowRetainedWarmRunner: true }))
+            .toBe("retained_warm_runner");
+        }
+        expect(computerRetirement.isRetired).not.toHaveBeenCalled();
+      }
+      expect(await verifyPriorRunnerdStateForSessionScope({ ...input, allowRetainedWarmRunner: false })).toBe(expected);
+      if (["retired", "uncertain", "stale-generation", "unavailable"].includes(condition)) {
+        expect(computerRetirement.isRetired).toHaveBeenCalledExactlyOnceWith({
+          companyId: current.binding.companyId, environmentId: "environment", agentId: current.binding.agentId,
+          runId: prior.binding.runId, owner,
+        });
+      } else expect(computerRetirement.isRetired).not.toHaveBeenCalled();
+    } finally { await rm(root, { recursive: true, force: true }); }
+  });
+
   it.each([
     { override: undefined, expected: "@openai/codex@0.160.0" },
     { override: "@openai/codex@0.159.0", expected: "@openai/codex@0.159.0" },
diff --git a/server/src/services/native-runtime/native-session-executor.ts b/server/src/services/native-runtime/native-session-executor.ts
index c5bf41a377..d411b71e70 100644
--- a/server/src/services/native-runtime/native-session-executor.ts
+++ b/server/src/services/native-runtime/native-session-executor.ts
@@ -1,3 +1,5 @@
+import { computerService } from "../../modules/computers/index.js";
+import { readNativeComputerWorkspaceReference } from "./native-workspace-sync.js";
 import { adapterExecutionTargetIsCommandBacked, type AdapterComputerExecutionTarget } from "@paperclipai/adapter-utils/execution-target";
 import { configuredEnvironment } from "../../vendor/paperclip-runner/index.js";
 import { agents } from "@paperclipai/db";
@@ -4295,6 +4297,7 @@ export async function verifyPriorRunnerdStateForSessionScope(input: {
   allowVerifiedBackup: boolean;
   allowRetainedWarmRunner: boolean;
   remoteRunnerState?: boolean;
+  runnerExecutionTarget?: AdapterExecutionTarget | null;
 }): Promise<PriorRunnerdStateVerification> {
   let priorRun: {
     status: string;
@@ -4352,6 +4355,49 @@ export async function verifyPriorRunnerdStateForSessionScope(input: {
     ) {
       return "retained_warm_runner";
     }
+    const target = input.runnerExecutionTarget;
+    if (input.remoteRunnerState && directLifecycle === "absent" &&
+        target?.kind === "remote" && target.transport === "computer" && target.environmentId) {
+      const descriptor = record(priorRun.runnerProfileJson).nativeComputerWorkspace;
+      const priorWorkspace = readNativeComputerWorkspaceReference(descriptor);
+      if (!priorWorkspace || priorWorkspace.computerOwner.computerId !== target.resourceAuthority.computerId ||
+          priorWorkspace.remoteCwd !== target.remoteCwd ||
+          record(descriptor).placementId !== target.fileAuthority.placementId) return "scope_mismatch";
+      // Persistent runners keep their state remotely. Once the exact prior
+      // owner has completed retirement, its terminal run and fenced process
+      // are authoritative even though no local runner-state.json exists.
+      // This read cannot retire a live owner or accept a newer generation.
+      try {
+        // Warm turns advance the attempt lease while the physical runner keeps
+        // its initial PRP lease identity. Verify that original lease belongs to
+        // this exact owner lineage instead of requiring the latest attempt id.
+        const [physicalLease] = await input.db.select({
+          providerLeaseId: environmentLeases.providerLeaseId,
+          metadata: environmentLeases.metadata,
+        }).from(environmentLeases).where(and(
+          eq(environmentLeases.id, input.identity.environmentLeaseId),
+          eq(environmentLeases.companyId, input.execution.binding.companyId),
+          eq(environmentLeases.environmentId, target.environmentId),
+        )).limit(1);
+        const leaseMetadata = record(physicalLease?.metadata);
+        const leaseOwner = record(leaseMetadata.computerOwner);
+        if (physicalLease?.providerLeaseId !== priorWorkspace.computerOwner.ownerId ||
+            leaseMetadata.agentId !== input.execution.binding.agentId ||
+            leaseOwner.computerId !== priorWorkspace.computerOwner.computerId ||
+            leaseOwner.ownerId !== priorWorkspace.computerOwner.ownerId ||
+            !Number.isSafeInteger(leaseOwner.generation) || Number(leaseOwner.generation) < 1 ||
+            Number(leaseOwner.generation) > priorWorkspace.computerOwner.generation) return "scope_mismatch";
+        if (await computerService(input.db).isRetired({
+          companyId: input.execution.binding.companyId,
+          environmentId: target.environmentId,
+          agentId: input.execution.binding.agentId,
+          runId: input.identity.runId,
+          owner: priorWorkspace.computerOwner,
+        })) return "verified";
+      } catch {
+        return "unavailable";
+      }
+    }
     return "terminal_state_indeterminate";
   } catch {
     return "authority_indeterminate";
@@ -4896,6 +4942,7 @@ async function migrateRunnerdStateRootForExecution(input: {
         allowRetainedWarmRunner: input.allowRetainedWarmRunner,
         remoteRunnerState: input.runnerExecutionTarget?.kind === "remote" &&
           input.runnerExecutionTarget.transport === "computer",
+        runnerExecutionTarget: input.runnerExecutionTarget,
       });
       if (
         verification !== "verified" &&
@@ -4940,6 +4987,7 @@ async function migrateRunnerdStateRootForExecution(input: {
         allowRetainedWarmRunner: input.allowRetainedWarmRunner,
         remoteRunnerState: input.runnerExecutionTarget?.kind === "remote" &&
           input.runnerExecutionTarget.transport === "computer",
+        runnerExecutionTarget: input.runnerExecutionTarget,
       });
       if (
         verification !== "verified" &&