diff --git a/extensions/matrix/src/cli.test.ts b/extensions/matrix/src/cli.test.ts
index 3be18e47a90..43468374c3a 100644
--- a/extensions/matrix/src/cli.test.ts
+++ b/extensions/matrix/src/cli.test.ts
@@ -5,6 +5,8 @@ import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 const bootstrapMatrixVerificationMock = vi.fn();
 const getMatrixRoomKeyBackupStatusMock = vi.fn();
 const getMatrixVerificationStatusMock = vi.fn();
+const listMatrixOwnDevicesMock = vi.fn();
+const pruneMatrixStaleGatewayDevicesMock = vi.fn();
 const resolveMatrixAccountConfigMock = vi.fn();
 const resolveMatrixAccountMock = vi.fn();
 const matrixSetupApplyAccountConfigMock = vi.fn();
@@ -25,6 +27,12 @@ vi.mock("./matrix/actions/verification.js", () => ({
   verifyMatrixRecoveryKey: (...args: unknown[]) => verifyMatrixRecoveryKeyMock(...args),
 }));
 
+vi.mock("./matrix/actions/devices.js", () => ({
+  listMatrixOwnDevices: (...args: unknown[]) => listMatrixOwnDevicesMock(...args),
+  pruneMatrixStaleGatewayDevices: (...args: unknown[]) =>
+    pruneMatrixStaleGatewayDevicesMock(...args),
+}));
+
 vi.mock("./matrix/client/logging.js", () => ({
   setMatrixSdkConsoleLogging: (...args: unknown[]) => setMatrixSdkConsoleLoggingMock(...args),
   setMatrixSdkLogMode: (...args: unknown[]) => setMatrixSdkLogModeMock(...args),
@@ -104,6 +112,14 @@ describe("matrix CLI verification commands", () => {
       resolvedAvatarUrl: null,
       convertedAvatarFromHttp: false,
     });
+    listMatrixOwnDevicesMock.mockResolvedValue([]);
+    pruneMatrixStaleGatewayDevicesMock.mockResolvedValue({
+      before: [],
+      staleGatewayDeviceIds: [],
+      currentDeviceId: null,
+      deletedDeviceIds: [],
+      remainingDevices: [],
+    });
   });
 
   afterEach(() => {
@@ -166,6 +182,77 @@ describe("matrix CLI verification commands", () => {
     expect(process.exitCode).toBe(1);
   });
 
+  it("lists matrix devices", async () => {
+    listMatrixOwnDevicesMock.mockResolvedValue([
+      {
+        deviceId: "A7hWrQ70ea",
+        displayName: "OpenClaw Gateway",
+        lastSeenIp: "127.0.0.1",
+        lastSeenTs: 1_741_507_200_000,
+        current: true,
+      },
+      {
+        deviceId: "BritdXC6iL",
+        displayName: "OpenClaw Gateway",
+        lastSeenIp: null,
+        lastSeenTs: null,
+        current: false,
+      },
+    ]);
+    const program = buildProgram();
+
+    await program.parseAsync(["matrix", "devices", "list", "--account", "poe"], { from: "user" });
+
+    expect(listMatrixOwnDevicesMock).toHaveBeenCalledWith({ accountId: "poe" });
+    expect(console.log).toHaveBeenCalledWith("Account: poe");
+    expect(console.log).toHaveBeenCalledWith("- A7hWrQ70ea (current, OpenClaw Gateway)");
+    expect(console.log).toHaveBeenCalledWith("  Last IP: 127.0.0.1");
+    expect(console.log).toHaveBeenCalledWith("- BritdXC6iL (OpenClaw Gateway)");
+  });
+
+  it("prunes stale matrix gateway devices", async () => {
+    pruneMatrixStaleGatewayDevicesMock.mockResolvedValue({
+      before: [
+        {
+          deviceId: "A7hWrQ70ea",
+          displayName: "OpenClaw Gateway",
+          lastSeenIp: "127.0.0.1",
+          lastSeenTs: 1_741_507_200_000,
+          current: true,
+        },
+        {
+          deviceId: "BritdXC6iL",
+          displayName: "OpenClaw Gateway",
+          lastSeenIp: null,
+          lastSeenTs: null,
+          current: false,
+        },
+      ],
+      staleGatewayDeviceIds: ["BritdXC6iL"],
+      currentDeviceId: "A7hWrQ70ea",
+      deletedDeviceIds: ["BritdXC6iL"],
+      remainingDevices: [
+        {
+          deviceId: "A7hWrQ70ea",
+          displayName: "OpenClaw Gateway",
+          lastSeenIp: "127.0.0.1",
+          lastSeenTs: 1_741_507_200_000,
+          current: true,
+        },
+      ],
+    });
+    const program = buildProgram();
+
+    await program.parseAsync(["matrix", "devices", "prune-stale", "--account", "poe"], {
+      from: "user",
+    });
+
+    expect(pruneMatrixStaleGatewayDevicesMock).toHaveBeenCalledWith({ accountId: "poe" });
+    expect(console.log).toHaveBeenCalledWith("Deleted stale OpenClaw devices: BritdXC6iL");
+    expect(console.log).toHaveBeenCalledWith("Current device: A7hWrQ70ea");
+    expect(console.log).toHaveBeenCalledWith("Remaining devices: 1");
+  });
+
   it("adds a matrix account and prints a binding hint", async () => {
     matrixRuntimeLoadConfigMock.mockReturnValue({ channels: {} });
     matrixSetupApplyAccountConfigMock.mockImplementation(
@@ -235,6 +322,22 @@ describe("matrix CLI verification commands", () => {
     resolveMatrixAccountConfigMock.mockReturnValue({
       encryption: true,
     });
+    listMatrixOwnDevicesMock.mockResolvedValue([
+      {
+        deviceId: "BritdXC6iL",
+        displayName: "OpenClaw Gateway",
+        lastSeenIp: null,
+        lastSeenTs: null,
+        current: false,
+      },
+      {
+        deviceId: "du314Zpw3A",
+        displayName: "OpenClaw Gateway",
+        lastSeenIp: null,
+        lastSeenTs: null,
+        current: true,
+      },
+    ]);
     bootstrapMatrixVerificationMock.mockResolvedValue({
       success: true,
       verification: {
@@ -270,6 +373,9 @@ describe("matrix CLI verification commands", () => {
       `Recovery key created at: ${formatExpectedLocalTimestamp("2026-03-09T06:00:00.000Z")}`,
     );
     expect(console.log).toHaveBeenCalledWith("Backup version: 7");
+    expect(console.log).toHaveBeenCalledWith(
+      "Matrix device hygiene warning: stale OpenClaw devices detected (BritdXC6iL). Run 'openclaw matrix devices prune-stale --account ops'.",
+    );
   });
 
   it("does not bootstrap verification when updating an already configured account", async () => {
diff --git a/extensions/matrix/src/cli.ts b/extensions/matrix/src/cli.ts
index 163dab0afd3..e8c56178f8e 100644
--- a/extensions/matrix/src/cli.ts
+++ b/extensions/matrix/src/cli.ts
@@ -6,6 +6,7 @@ import {
 } from "openclaw/plugin-sdk/matrix";
 import { matrixPlugin } from "./channel.js";
 import { resolveMatrixAccount, resolveMatrixAccountConfig } from "./matrix/accounts.js";
+import { listMatrixOwnDevices, pruneMatrixStaleGatewayDevices } from "./matrix/actions/devices.js";
 import { updateMatrixOwnProfile } from "./matrix/actions/profile.js";
 import {
   bootstrapMatrixVerification,
@@ -16,6 +17,7 @@ import {
 } from "./matrix/actions/verification.js";
 import { setMatrixSdkConsoleLogging, setMatrixSdkLogMode } from "./matrix/client/logging.js";
 import { resolveMatrixConfigPath, updateMatrixAccountConfig } from "./matrix/config-update.js";
+import { isOpenClawManagedMatrixDevice } from "./matrix/device-health.js";
 import { applyMatrixProfileUpdate, type MatrixProfileUpdateResult } from "./profile-update.js";
 import { getMatrixRuntime } from "./runtime.js";
 import type { CoreConfig } from "./types.js";
@@ -67,6 +69,31 @@ function printAccountLabel(accountId?: string): void {
   console.log(`Account: ${normalizeAccountId(accountId)}`);
 }
 
+function printMatrixOwnDevices(
+  devices: Array<{
+    deviceId: string;
+    displayName: string | null;
+    lastSeenIp: string | null;
+    lastSeenTs: number | null;
+    current: boolean;
+  }>,
+): void {
+  if (devices.length === 0) {
+    console.log("Devices: none");
+    return;
+  }
+  for (const device of devices) {
+    const labels = [device.current ? "current" : null, device.displayName].filter(Boolean);
+    console.log(`- ${device.deviceId}${labels.length ? ` (${labels.join(", ")})` : ""}`);
+    if (device.lastSeenTs) {
+      printTimestamp("  Last seen", new Date(device.lastSeenTs).toISOString());
+    }
+    if (device.lastSeenIp) {
+      console.log(`  Last IP: ${device.lastSeenIp}`);
+    }
+  }
+}
+
 function configureCliLogMode(verbose: boolean): void {
   setMatrixSdkLogMode(verbose ? "default" : "quiet");
   setMatrixSdkConsoleLogging(verbose);
@@ -88,6 +115,10 @@ type MatrixCliAccountAddResult = {
   accountId: string;
   configPath: string;
   useEnv: boolean;
+  deviceHealth: {
+    currentDeviceId: string | null;
+    staleOpenClawDeviceIds: string[];
+  };
   verificationBootstrap: {
     attempted: boolean;
     success: boolean;
@@ -233,10 +264,20 @@ async function addMatrixAccount(params: {
     }
   }
 
+  const addedDevices = await listMatrixOwnDevices({ accountId });
+  const currentDeviceId = addedDevices.find((device) => device.current)?.deviceId ?? null;
+  const staleOpenClawDeviceIds = addedDevices
+    .filter((device) => !device.current && isOpenClawManagedMatrixDevice(device.displayName))
+    .map((device) => device.deviceId);
+
   return {
     accountId,
     configPath: resolveMatrixConfigPath(updated, accountId),
     useEnv: input.useEnv === true,
+    deviceHealth: {
+      currentDeviceId,
+      staleOpenClawDeviceIds,
+    },
     verificationBootstrap,
     profile,
   };
@@ -638,6 +679,11 @@ export function registerMatrixCli(params: { program: Command }): void {
                 );
               }
             }
+            if (result.deviceHealth.staleOpenClawDeviceIds.length > 0) {
+              console.log(
+                `Matrix device hygiene warning: stale OpenClaw devices detected (${result.deviceHealth.staleOpenClawDeviceIds.join(", ")}). Run 'openclaw matrix devices prune-stale --account ${result.accountId}'.`,
+              );
+            }
             if (result.profile.attempted) {
               if (result.profile.error) {
                 console.error(`Profile sync warning: ${result.profile.error}`);
@@ -900,4 +946,54 @@ export function registerMatrixCli(params: { program: Command }): void {
         });
       },
     );
+
+  const devices = root.command("devices").description("Inspect and clean up Matrix devices");
+
+  devices
+    .command("list")
+    .description("List server-side Matrix devices for this account")
+    .option("--account <id>", "Account ID (for multi-account setups)")
+    .option("--verbose", "Show detailed diagnostics")
+    .option("--json", "Output as JSON")
+    .action(async (options: { account?: string; verbose?: boolean; json?: boolean }) => {
+      await runMatrixCliCommand({
+        verbose: options.verbose === true,
+        json: options.json === true,
+        run: async () => await listMatrixOwnDevices({ accountId: options.account }),
+        onText: (result) => {
+          printAccountLabel(options.account);
+          printMatrixOwnDevices(result);
+        },
+        errorPrefix: "Device listing failed",
+      });
+    });
+
+  devices
+    .command("prune-stale")
+    .description("Delete stale OpenClaw-managed devices for this account")
+    .option("--account <id>", "Account ID (for multi-account setups)")
+    .option("--verbose", "Show detailed diagnostics")
+    .option("--json", "Output as JSON")
+    .action(async (options: { account?: string; verbose?: boolean; json?: boolean }) => {
+      await runMatrixCliCommand({
+        verbose: options.verbose === true,
+        json: options.json === true,
+        run: async () => await pruneMatrixStaleGatewayDevices({ accountId: options.account }),
+        onText: (result, verbose) => {
+          printAccountLabel(options.account);
+          console.log(
+            `Deleted stale OpenClaw devices: ${result.deletedDeviceIds.length ? result.deletedDeviceIds.join(", ") : "none"}`,
+          );
+          console.log(`Current device: ${result.currentDeviceId ?? "unknown"}`);
+          console.log(`Remaining devices: ${result.remainingDevices.length}`);
+          if (verbose) {
+            console.log("Devices before cleanup:");
+            printMatrixOwnDevices(result.before);
+            console.log("Devices after cleanup:");
+            printMatrixOwnDevices(result.remainingDevices);
+          }
+        },
+        errorPrefix: "Device cleanup failed",
+      });
+    });
 }
diff --git a/extensions/matrix/src/matrix/actions/devices.test.ts b/extensions/matrix/src/matrix/actions/devices.test.ts
new file mode 100644
index 00000000000..4a90d5e1925
--- /dev/null
+++ b/extensions/matrix/src/matrix/actions/devices.test.ts
@@ -0,0 +1,118 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+const withResolvedActionClientMock = vi.fn();
+
+vi.mock("./client.js", () => ({
+  withResolvedActionClient: (...args: unknown[]) => withResolvedActionClientMock(...args),
+}));
+
+let listMatrixOwnDevices: typeof import("./devices.js").listMatrixOwnDevices;
+let pruneMatrixStaleGatewayDevices: typeof import("./devices.js").pruneMatrixStaleGatewayDevices;
+
+describe("matrix device actions", () => {
+  beforeEach(async () => {
+    vi.resetModules();
+    vi.clearAllMocks();
+    ({ listMatrixOwnDevices, pruneMatrixStaleGatewayDevices } = await import("./devices.js"));
+  });
+
+  it("lists own devices on a started client", async () => {
+    withResolvedActionClientMock.mockImplementation(async (_opts, run) => {
+      return await run({
+        listOwnDevices: vi.fn(async () => [
+          {
+            deviceId: "A7hWrQ70ea",
+            displayName: "OpenClaw Gateway",
+            lastSeenIp: null,
+            lastSeenTs: null,
+            current: true,
+          },
+        ]),
+      });
+    });
+
+    const result = await listMatrixOwnDevices({ accountId: "poe" });
+
+    expect(withResolvedActionClientMock).toHaveBeenCalledWith(
+      { accountId: "poe", readiness: "started" },
+      expect.any(Function),
+      "persist",
+    );
+    expect(result).toEqual([
+      expect.objectContaining({
+        deviceId: "A7hWrQ70ea",
+        current: true,
+      }),
+    ]);
+  });
+
+  it("prunes stale OpenClaw-managed devices but preserves the current device", async () => {
+    const deleteOwnDevices = vi.fn(async () => ({
+      currentDeviceId: "du314Zpw3A",
+      deletedDeviceIds: ["BritdXC6iL", "G6NJU9cTgs", "My3T0hkTE0"],
+      remainingDevices: [
+        {
+          deviceId: "du314Zpw3A",
+          displayName: "OpenClaw Gateway",
+          lastSeenIp: null,
+          lastSeenTs: null,
+          current: true,
+        },
+      ],
+    }));
+    withResolvedActionClientMock.mockImplementation(async (_opts, run) => {
+      return await run({
+        listOwnDevices: vi.fn(async () => [
+          {
+            deviceId: "du314Zpw3A",
+            displayName: "OpenClaw Gateway",
+            lastSeenIp: null,
+            lastSeenTs: null,
+            current: true,
+          },
+          {
+            deviceId: "BritdXC6iL",
+            displayName: "OpenClaw Gateway",
+            lastSeenIp: null,
+            lastSeenTs: null,
+            current: false,
+          },
+          {
+            deviceId: "G6NJU9cTgs",
+            displayName: "OpenClaw Debug",
+            lastSeenIp: null,
+            lastSeenTs: null,
+            current: false,
+          },
+          {
+            deviceId: "My3T0hkTE0",
+            displayName: "OpenClaw Gateway",
+            lastSeenIp: null,
+            lastSeenTs: null,
+            current: false,
+          },
+          {
+            deviceId: "phone123",
+            displayName: "Element iPhone",
+            lastSeenIp: null,
+            lastSeenTs: null,
+            current: false,
+          },
+        ]),
+        deleteOwnDevices,
+      });
+    });
+
+    const result = await pruneMatrixStaleGatewayDevices({ accountId: "poe" });
+
+    expect(deleteOwnDevices).toHaveBeenCalledWith(["BritdXC6iL", "G6NJU9cTgs", "My3T0hkTE0"]);
+    expect(result.staleGatewayDeviceIds).toEqual(["BritdXC6iL", "G6NJU9cTgs", "My3T0hkTE0"]);
+    expect(result.deletedDeviceIds).toEqual(["BritdXC6iL", "G6NJU9cTgs", "My3T0hkTE0"]);
+    expect(result.remainingDevices).toEqual([
+      expect.objectContaining({
+        deviceId: "du314Zpw3A",
+        current: true,
+      }),
+    ]);
+  });
+});
diff --git a/extensions/matrix/src/matrix/actions/devices.ts b/extensions/matrix/src/matrix/actions/devices.ts
new file mode 100644
index 00000000000..452f4e72d7e
--- /dev/null
+++ b/extensions/matrix/src/matrix/actions/devices.ts
@@ -0,0 +1,44 @@
+import { summarizeMatrixDeviceHealth } from "../device-health.js";
+import { withResolvedActionClient } from "./client.js";
+import type { MatrixActionClientOpts } from "./types.js";
+
+export async function listMatrixOwnDevices(opts: MatrixActionClientOpts = {}) {
+  return await withResolvedActionClient(
+    { ...opts, readiness: "started" },
+    async (client) => await client.listOwnDevices(),
+    "persist",
+  );
+}
+
+export async function pruneMatrixStaleGatewayDevices(opts: MatrixActionClientOpts = {}) {
+  return await withResolvedActionClient(
+    { ...opts, readiness: "started" },
+    async (client) => {
+      const devices = await client.listOwnDevices();
+      const health = summarizeMatrixDeviceHealth(devices);
+      const staleGatewayDeviceIds = health.staleOpenClawDevices.map((device) => device.deviceId);
+      const deleted =
+        staleGatewayDeviceIds.length > 0
+          ? await client.deleteOwnDevices(staleGatewayDeviceIds)
+          : {
+              currentDeviceId: devices.find((device) => device.current)?.deviceId ?? null,
+              deletedDeviceIds: [] as string[],
+              remainingDevices: devices,
+            };
+      return {
+        before: devices,
+        staleGatewayDeviceIds,
+        ...deleted,
+      };
+    },
+    "persist",
+  );
+}
+
+export async function getMatrixDeviceHealth(opts: MatrixActionClientOpts = {}) {
+  return await withResolvedActionClient(
+    { ...opts, readiness: "started" },
+    async (client) => summarizeMatrixDeviceHealth(await client.listOwnDevices()),
+    "persist",
+  );
+}
diff --git a/extensions/matrix/src/matrix/device-health.test.ts b/extensions/matrix/src/matrix/device-health.test.ts
new file mode 100644
index 00000000000..8de5d825251
--- /dev/null
+++ b/extensions/matrix/src/matrix/device-health.test.ts
@@ -0,0 +1,45 @@
+import { describe, expect, it } from "vitest";
+import { isOpenClawManagedMatrixDevice, summarizeMatrixDeviceHealth } from "./device-health.js";
+
+describe("matrix device health", () => {
+  it("detects OpenClaw-managed device names", () => {
+    expect(isOpenClawManagedMatrixDevice("OpenClaw Gateway")).toBe(true);
+    expect(isOpenClawManagedMatrixDevice("OpenClaw Debug")).toBe(true);
+    expect(isOpenClawManagedMatrixDevice("Element iPhone")).toBe(false);
+    expect(isOpenClawManagedMatrixDevice(null)).toBe(false);
+  });
+
+  it("summarizes stale OpenClaw-managed devices separately from the current device", () => {
+    const summary = summarizeMatrixDeviceHealth([
+      {
+        deviceId: "du314Zpw3A",
+        displayName: "OpenClaw Gateway",
+        current: true,
+      },
+      {
+        deviceId: "BritdXC6iL",
+        displayName: "OpenClaw Gateway",
+        current: false,
+      },
+      {
+        deviceId: "G6NJU9cTgs",
+        displayName: "OpenClaw Debug",
+        current: false,
+      },
+      {
+        deviceId: "phone123",
+        displayName: "Element iPhone",
+        current: false,
+      },
+    ]);
+
+    expect(summary.currentDeviceId).toBe("du314Zpw3A");
+    expect(summary.currentOpenClawDevices).toEqual([
+      expect.objectContaining({ deviceId: "du314Zpw3A" }),
+    ]);
+    expect(summary.staleOpenClawDevices).toEqual([
+      expect.objectContaining({ deviceId: "BritdXC6iL" }),
+      expect.objectContaining({ deviceId: "G6NJU9cTgs" }),
+    ]);
+  });
+});
diff --git a/extensions/matrix/src/matrix/device-health.ts b/extensions/matrix/src/matrix/device-health.ts
new file mode 100644
index 00000000000..6f0d4408a55
--- /dev/null
+++ b/extensions/matrix/src/matrix/device-health.ts
@@ -0,0 +1,31 @@
+export type MatrixManagedDeviceInfo = {
+  deviceId: string;
+  displayName: string | null;
+  current: boolean;
+};
+
+export type MatrixDeviceHealthSummary = {
+  currentDeviceId: string | null;
+  staleOpenClawDevices: MatrixManagedDeviceInfo[];
+  currentOpenClawDevices: MatrixManagedDeviceInfo[];
+};
+
+const OPENCLAW_DEVICE_NAME_PREFIX = "OpenClaw ";
+
+export function isOpenClawManagedMatrixDevice(displayName: string | null | undefined): boolean {
+  return displayName?.startsWith(OPENCLAW_DEVICE_NAME_PREFIX) === true;
+}
+
+export function summarizeMatrixDeviceHealth(
+  devices: MatrixManagedDeviceInfo[],
+): MatrixDeviceHealthSummary {
+  const currentDeviceId = devices.find((device) => device.current)?.deviceId ?? null;
+  const openClawDevices = devices.filter((device) =>
+    isOpenClawManagedMatrixDevice(device.displayName),
+  );
+  return {
+    currentDeviceId,
+    staleOpenClawDevices: openClawDevices.filter((device) => !device.current),
+    currentOpenClawDevices: openClawDevices.filter((device) => device.current),
+  };
+}
diff --git a/extensions/matrix/src/matrix/monitor/index.ts b/extensions/matrix/src/matrix/monitor/index.ts
index 17f30a775eb..c8d148e28fb 100644
--- a/extensions/matrix/src/matrix/monitor/index.ts
+++ b/extensions/matrix/src/matrix/monitor/index.ts
@@ -23,6 +23,7 @@ import {
   stopSharedClientForAccount,
 } from "../client.js";
 import { updateMatrixAccountConfig } from "../config-update.js";
+import { summarizeMatrixDeviceHealth } from "../device-health.js";
 import { syncMatrixOwnProfile } from "../profile.js";
 import { createMatrixThreadBindingManager } from "../thread-bindings.js";
 import { normalizeMatrixUserId } from "./allowlist.js";
@@ -400,6 +401,19 @@ export async function monitorMatrixProvider(opts: MonitorMatrixOpts = {}): Promi
   // If E2EE is enabled, report device verification status and request self-verification
   // when configured and the device is still unverified.
   if (auth.encryption && client.crypto) {
+    try {
+      const deviceHealth = summarizeMatrixDeviceHealth(await client.listOwnDevices());
+      if (deviceHealth.staleOpenClawDevices.length > 0) {
+        logger.warn(
+          `matrix: stale OpenClaw devices detected for ${auth.userId}: ${deviceHealth.staleOpenClawDevices.map((device) => device.deviceId).join(", ")}. Run 'openclaw matrix devices prune-stale --account ${effectiveAccountId}' to keep encrypted-room trust healthy.`,
+        );
+      }
+    } catch (err) {
+      logger.debug?.("Failed to inspect matrix device hygiene (non-fatal)", {
+        error: String(err),
+      });
+    }
+
     try {
       const startupVerification = await ensureMatrixStartupVerification({
         client,
diff --git a/extensions/matrix/src/matrix/sdk.ts b/extensions/matrix/src/matrix/sdk.ts
index d6ac4f3de9a..925811354fc 100644
--- a/extensions/matrix/src/matrix/sdk.ts
+++ b/extensions/matrix/src/matrix/sdk.ts
@@ -107,6 +107,20 @@ export type MatrixVerificationBootstrapResult = {
   cryptoBootstrap: MatrixCryptoBootstrapResult | null;
 };
 
+export type MatrixOwnDeviceInfo = {
+  deviceId: string;
+  displayName: string | null;
+  lastSeenIp: string | null;
+  lastSeenTs: number | null;
+  current: boolean;
+};
+
+export type MatrixOwnDeviceDeleteResult = {
+  currentDeviceId: string | null;
+  deletedDeviceIds: string[];
+  remainingDevices: MatrixOwnDeviceInfo[];
+};
+
 function normalizeOptionalString(value: string | null | undefined): string | null {
   const normalized = value?.trim();
   return normalized ? normalized : null;
@@ -983,6 +997,68 @@ export class MatrixClient {
     };
   }
 
+  async listOwnDevices(): Promise<MatrixOwnDeviceInfo[]> {
+    const currentDeviceId = this.client.getDeviceId()?.trim() || null;
+    const devices = await this.client.getDevices();
+    const entries = Array.isArray(devices?.devices) ? devices.devices : [];
+    return entries.map((device) => ({
+      deviceId: device.device_id,
+      displayName: device.display_name?.trim() || null,
+      lastSeenIp: device.last_seen_ip?.trim() || null,
+      lastSeenTs:
+        typeof device.last_seen_ts === "number" && Number.isFinite(device.last_seen_ts)
+          ? device.last_seen_ts
+          : null,
+      current: currentDeviceId !== null && device.device_id === currentDeviceId,
+    }));
+  }
+
+  async deleteOwnDevices(deviceIds: string[]): Promise<MatrixOwnDeviceDeleteResult> {
+    const uniqueDeviceIds = [...new Set(deviceIds.map((value) => value.trim()).filter(Boolean))];
+    const currentDeviceId = this.client.getDeviceId()?.trim() || null;
+    const protectedDeviceIds = uniqueDeviceIds.filter((deviceId) => deviceId === currentDeviceId);
+    if (protectedDeviceIds.length > 0) {
+      throw new Error(`Refusing to delete the current Matrix device: ${protectedDeviceIds[0]}`);
+    }
+
+    const deleteWithAuth = async (authData?: Record<string, unknown>): Promise<void> => {
+      await this.client.deleteMultipleDevices(uniqueDeviceIds, authData as never);
+    };
+
+    if (uniqueDeviceIds.length > 0) {
+      try {
+        await deleteWithAuth();
+      } catch (err) {
+        const session =
+          err &&
+          typeof err === "object" &&
+          "data" in err &&
+          err.data &&
+          typeof err.data === "object" &&
+          "session" in err.data &&
+          typeof err.data.session === "string"
+            ? err.data.session
+            : null;
+        const userId = await this.getUserId().catch(() => this.selfUserId);
+        if (!session || !userId || !this.password?.trim()) {
+          throw err;
+        }
+        await deleteWithAuth({
+          type: "m.login.password",
+          session,
+          identifier: { type: "m.id.user", user: userId },
+          password: this.password,
+        });
+      }
+    }
+
+    return {
+      currentDeviceId,
+      deletedDeviceIds: uniqueDeviceIds,
+      remainingDevices: await this.listOwnDevices(),
+    };
+  }
+
   private async resolveActiveRoomKeyBackupVersion(
     crypto: MatrixCryptoBootstrapApi,
   ): Promise<string | null> {