hassantsyed · Aug 28, 2026 · Oct 3, 2026 · Oct 3, 2026 · Oct 3, 2026 · Oct 3, 2026
diff --git a/.fallowrc.json b/.fallowrc.json
@@ -2,6 +2,10 @@
   "$schema": "https://raw.githubusercontent.com/fallow-rs/fallow/main/schema.json",
   "entry": [
     "tsdown.config.ts",
+    "scripts/check-provider-plugin.mjs",
+    "packages/provider-doublespeed/test/package-smoke.mjs",
+    "packages/provider-doublespeed/tsdown.config.ts",
+    "packages/provider-doublespeed/src/plugin.ts",
     "vitest.mutation.config.ts",
     "src/sdk/index.ts",
     "src/sdk/io.ts",
@@ -10,6 +14,7 @@
     "src/sdk/remote-config.ts",
     "src/sdk/install-source.ts",
     "src/sdk/plugins.ts",
+    "src/sdk/plugin-webdriver.ts",
     "src/sdk/android-adb.ts",
     "src/sdk/contracts.ts",
     "src/sdk/selectors.ts",
@@ -69,6 +74,11 @@
     "@arethetypeswrong/cli"
   ],
   "ignoreExports": [
+    {
+      "comment": "The standalone packed-install harness loads this fixture from the selected package path and reads its request scenarios dynamically.",
+      "file": "packages/provider-*/test/package-smoke.mjs",
+      "exports": ["*"]
+    },
     {
       "comment": "Android perf mechanics are selected through the lazy platform host so importing agent-device does not eagerly load adb mechanics. Fallow cannot follow the dynamic property read in src/platform-runtime-perf-host.ts.",
       "file": "packages/platform-android/src/perf.ts",
@@ -290,7 +300,8 @@
     },
     {
       "comment": "Tool config default exports, loaded by the tool rather than imported.",
-      "file": "{oxlint.config.ts,tsdown.config.ts,packages/proxy/tsdown.config.ts,vitest.mutation.config.ts,website/rspress.config.ts}",
+      "file": "{oxlint.config.ts,tsdown.config.ts,packages/provider-*/tsdown.config.ts,packages/proxy/tsdown.config.ts,vitest.mutation.config.ts,website/rspress.config.ts}",
+
       "exports": ["default"]
     },
     {

diff --git a/README.md b/README.md
@@ -137,15 +137,15 @@ The same session and evidence model works at every step: the agent explores the
 | --- | --- | --- |
 | Local | Trying commands and debugging apps on simulators, emulators, physical devices, macOS, and Linux. | Follow the Quick Start. |
 | CI/CD | Automated pull request and merge validation with replay scripts and captured artifacts. | Try the [EAS workflow template](https://github.com/callstackincubator/eas-agent-device/blob/main/.eas/workflows/agent-qa-mobile.yml). |
-| Cloud / remote | Linux runners, managed devices, and remote jobs. | Set up a [remote proxy](https://oss.callstack.com/agent-device/docs/remote-proxy), connect a [device cloud](https://oss.callstack.com/agent-device/docs/device-clouds) (BrowserStack, AWS Device Farm, Limrun), or [contact Callstack](mailto:hello@callstack.com) for team QA. |
+| Cloud / remote | Linux runners, managed devices, and remote jobs. | Set up a [remote proxy](https://oss.callstack.com/agent-device/docs/remote-proxy), connect a [device cloud](https://oss.callstack.com/agent-device/docs/device-clouds) (BrowserStack, AWS Device Farm, Limrun, Doublespeed), or [contact Callstack](mailto:hello@callstack.com) for team QA. |
 
 ## How it works
 
 `agent-device` keeps device state in sessions. It uses a local accessibility bridge for iOS Simulator snapshots and XCTest for iOS interactions, physical iOS, and tvOS; ADB and the snapshot helper on Android; HDC and ArkUI `uitest` on HarmonyOS; Vega CLI/VDA on the Vega Virtual Device; a local helper on macOS; and AT-SPI on Linux.
 
 Support depth varies by target. Newer backends such as HarmonyOS and Vega OS cover a subset of commands; run `agent-device capabilities --platform <platform>` to see what a target supports.
 
-Sessions are scoped to the caller's git worktree, and host-local device claims stop parallel agents from taking over each other's simulators and emulators. Inspect ownership without a daemon via `agent-device device status`, and settle provably dead owners with `agent-device device release --stale`. The same commands drive hosted devices on [BrowserStack, AWS Device Farm, and Limrun](https://oss.callstack.com/agent-device/docs/device-clouds).
+Sessions are scoped to the caller's git worktree, and host-local device claims stop parallel agents from taking over each other's simulators and emulators. Inspect ownership without a daemon via `agent-device device status`, and settle provably dead owners with `agent-device device release --stale`. The same commands drive hosted devices on [BrowserStack, AWS Device Farm, Limrun, and Doublespeed](https://oss.callstack.com/agent-device/docs/device-clouds).
 
 `agent-device` uses the inspect-act-verify process from Vercel's [agent-browser](https://github.com/vercel-labs/agent-browser) for mobile, TV, and desktop apps. Basic `--platform web` support runs `agent-browser` in the same session and replay system.
 

diff --git a/package.json b/package.json
@@ -73,6 +73,10 @@
     "./plugins": {
       "types": "./dist/src/plugins.d.ts",
       "import": "./dist/src/plugins.js"
+    },
+    "./plugins/webdriver": {
+      "types": "./dist/src/plugins/webdriver.d.ts",
+      "import": "./dist/src/plugins/webdriver.js"
     }
   },
   "engines": {
@@ -175,7 +179,7 @@
     "check:unit": "pnpm test:unit && pnpm check:tmpdir-leaks && pnpm test:smoke",
     "check": "pnpm check:tooling && pnpm check:fallow && pnpm check:unit",
     "prepack": "npm_config_dry_run=false pnpm release:prepare",
-    "typecheck": "tsc -b packages/xml packages/kernel packages/contracts packages/device-selection packages/host-kit packages/capture-kit packages/managed-allocation packages/provision-kit packages/platform-apple packages/platform-android packages/platform-harmonyos packages/platform-vega packages/platform-linux packages/platform-web packages/ad-script packages/selectors packages/command-registry packages/session-journal packages/ad-replay packages/maestro packages/replay-port packages/replay-test packages/provider-webdriver packages/provider-limrun packages/proxy && tsc -p tsconfig.json && tsc -p examples/sdk/tsconfig.json",
+    "typecheck": "tsc -b packages/xml packages/kernel packages/contracts packages/device-selection packages/host-kit packages/capture-kit packages/managed-allocation packages/provision-kit packages/platform-apple packages/platform-android packages/platform-harmonyos packages/platform-vega packages/platform-linux packages/platform-web packages/ad-script packages/selectors packages/command-registry packages/session-journal packages/ad-replay packages/maestro packages/replay-port packages/replay-test packages/provider-webdriver packages/provider-limrun packages/proxy packages/provider-doublespeed && tsc -p tsconfig.json && tsc -p examples/sdk/tsconfig.json",
     "test-app:install": "pnpm install --dir examples/test-app",
     "test-app:start": "pnpm --dir examples/test-app start",
     "test-app:ios": "pnpm --dir examples/test-app ios",
@@ -342,6 +346,7 @@
     "vite": "^8.2.1",
     "vitest": "^4.1.11",
     "yaml": "^2.9.0",
-    "yauzl": "^3.4.0"
+    "yauzl": "^3.4.0",
+    "@agent-device/doublespeed": "workspace:*"
   }
 }
diff --git a/packages/capture-kit/src/ios-snapshot-acquisition.ts b/packages/capture-kit/src/ios-snapshot-acquisition.ts
@@ -41,6 +41,14 @@ const IOS_PROVIDER_ACQUISITION_CAPABILITY_VALUES = {
     },
     hittabilityEvidence: 'unavailable',
   },
+  'doublespeed-ios-tree': {
+    producer: 'doublespeed-ios-tree',
+    acquisitionDepth: {
+      rawTraversal: { kind: 'incomplete' },
+      regularPresented: { kind: 'incomplete' },
+    },
+    hittabilityEvidence: 'unavailable',
+  },
 } as const satisfies Record<IosProviderAcquisitionProducer, IosProviderAcquisitionCapabilities>;
 
 /**
@@ -60,6 +68,7 @@ const IOS_SNAPSHOT_TRUNCATION_EVIDENCE = {
   'simulator-ax-bridge': 'available',
   'appium-source': 'unavailable',
   'limrun-ios-tree': 'unavailable',
+  'doublespeed-ios-tree': 'unavailable',
 } as const satisfies Record<IosSnapshotProducer, IosSnapshotEvidenceAvailability>;
 
 export function iosSnapshotTruncationEvidence(

diff --git a/packages/capture-kit/src/ios-snapshot-planning.test.ts b/packages/capture-kit/src/ios-snapshot-planning.test.ts
@@ -103,6 +103,7 @@ test('truncation evidence is declared for every iOS producer', () => {
     'simulator-ax-bridge': 'available',
     'appium-source': 'unavailable',
     'limrun-ios-tree': 'unavailable',
+    'doublespeed-ios-tree': 'unavailable',
   } as const satisfies Record<IosSnapshotProducer, IosSnapshotEvidenceAvailability>;
 
   for (const producer of Object.keys(expected) as IosSnapshotProducer[]) {

diff --git a/packages/contracts/src/facades/remote.ts b/packages/contracts/src/facades/remote.ts
@@ -11,6 +11,7 @@ export type {
   ResolvedMetroKind,
 } from '../metro.ts';
 export type {
+  ConnectionProviderCapabilities,
   ProviderConnectionResource,
   ProviderConnectionVerification,
 } from '../provider-connection.ts';

diff --git a/packages/contracts/src/ios-snapshot.ts b/packages/contracts/src/ios-snapshot.ts
@@ -4,12 +4,13 @@ export type IosSnapshotProducer =
   | 'apple-runner'
   | 'simulator-ax-bridge'
   | 'appium-source'
-  | 'limrun-ios-tree';
+  | 'limrun-ios-tree'
+  | 'doublespeed-ios-tree';
 
 export type IosAcquisitionProducer = Exclude<IosSnapshotProducer, 'apple-runner'>;
 export type IosProviderAcquisitionProducer = Extract<
   IosAcquisitionProducer,
-  'appium-source' | 'limrun-ios-tree'
+  'appium-source' | 'limrun-ios-tree' | 'doublespeed-ios-tree'
 >;
 export type IosAcquisitionIntent = 'full' | 'surface-observation';
 export type IosSnapshotProjection = 'regular' | 'raw';

diff --git a/packages/contracts/src/provider-connection.ts b/packages/contracts/src/provider-connection.ts
@@ -17,3 +17,13 @@ export type ProviderConnectionVerification = {
   device: ProviderConnectionResource;
   app: ProviderConnectionResource;
 };
+
+export type ConnectionProviderCapabilities = {
+  leaseKind: 'proxy' | 'direct-device-provider' | 'remote-provider';
+  requiresAppAttachment: boolean;
+  requiresRemoteDaemon: boolean;
+  supportsArtifacts: boolean;
+  supportsDeferredAppSelection: boolean;
+  supportsDirectPortReverse: boolean;
+  usesCloudWebDriverLease: boolean;
+};
diff --git a/packages/kernel/src/errors.test.ts b/packages/kernel/src/errors.test.ts
@@ -178,3 +178,20 @@ test('discloseDispatchAfterSteps keeps no only while no step of the series was d
   const plain = new Error('socket closed');
   assert.equal(discloseDispatchAfterSteps(plain, 4), plain);
 });
+
+test('bundled plugin errors preserve codes and details without changing subclass checks', async () => {
+  const copyPath = './errors.ts?plugin-copy';
+  const { AppError: PluginError } = await import(copyPath);
+  assert.notEqual(PluginError, AppError);
+  const foreign = new PluginError('INVALID_ARGS', 'bad plugin profile', { provider: 'example' });
+  assert.ok(foreign instanceof AppError);
+  const normalized = normalizeError(foreign);
+  assert.equal(normalized.code, 'INVALID_ARGS');
+  assert.equal(normalized.message, 'bad plugin profile');
+  assert.deepEqual(normalized.details, { provider: 'example' });
+  const ordinary = Object.assign(new Error('bad plugin profile'), { code: 'INVALID_ARGS' });
+  assert.equal(ordinary instanceof AppError, false);
+  class SpecificError extends AppError {}
+  assert.ok(new SpecificError('COMMAND_FAILED', 'specific') instanceof SpecificError);
+  assert.equal(foreign instanceof SpecificError, false);
+});
diff --git a/packages/kernel/src/errors.ts b/packages/kernel/src/errors.ts
@@ -36,6 +36,31 @@ export type KnownAppErrorCode = (typeof KNOWN_APP_ERROR_CODES)[number];
 // include a default branch.
 export type AppErrorCode = KnownAppErrorCode | (string & {});
 
+const APP_ERROR_BRAND = Symbol.for('agent-device.AppError');
+
+export class AppError extends Error {
+  static [Symbol.hasInstance](value: unknown): boolean {
+    if (this !== AppError) return Function.prototype[Symbol.hasInstance].call(this, value);
+    return (
+      typeof value === 'object' &&
+      value !== null &&
+      (value as Record<symbol, unknown>)[APP_ERROR_BRAND] === true
+    );
+  }
+
+  code: AppErrorCode;
+  details?: AppErrorDetails;
+  cause?: unknown;
+
+  constructor(code: AppErrorCode, message: string, details?: AppErrorDetails, cause?: unknown) {
+    super(message);
+    Object.defineProperty(this, APP_ERROR_BRAND, { value: true });
+    this.code = code;
+    this.details = details;
+    this.cause = cause;
+  }
+}
+
 export function toAppErrorCode(
   code: string | undefined,
   fallback: AppErrorCode = 'COMMAND_FAILED',
@@ -219,19 +244,6 @@ export type DaemonError = {
   supportedOn?: string;
 };
 
-export class AppError extends Error {
-  code: AppErrorCode;
-  details?: AppErrorDetails;
-  cause?: unknown;
-
-  constructor(code: AppErrorCode, message: string, details?: AppErrorDetails, cause?: unknown) {
-    super(message);
-    this.code = code;
-    this.details = details;
-    this.cause = cause;
-  }
-}
-
 /** Rehydrate a daemon transport error into the error type used by local callers. */
 export function throwDaemonError(error: DaemonError): never {
   throw new AppError(

diff --git a/packages/kernel/src/snapshot-provenance.test.ts b/packages/kernel/src/snapshot-provenance.test.ts
@@ -30,4 +30,8 @@ test('snapshotStateProvenance extracts exactly the pair', () => {
     backend: 'xctest',
     producer: 'limrun-ios-tree',
   });
+  expect(snapshotStateProvenance({ backend: 'xctest', producer: 'doublespeed-ios-tree' })).toEqual({
+    backend: 'xctest',
+    producer: 'doublespeed-ios-tree',
+  });
 });
diff --git a/packages/kernel/src/snapshot.ts b/packages/kernel/src/snapshot.ts
@@ -478,7 +478,7 @@ export function formatRole(type: string): string {
 /**
  * The channel↔producer pairs that can actually occur. One channel is fed by several producers
  * with different guarantees: `xctest` trees come from the local Apple runner, Appium
- * page-source XML, or a limrun element tree, and only the runner's output has been through the
+ * page-source XML, or a Limrun or Doublespeed element tree, and only the runner's output has been through the
  * runner's presentation (clip fold, effective geometry, scope). Logic that assumes
  * presentation, scope, or geometry guarantees must key on the producer, never on the channel
  * alone.
@@ -492,7 +492,12 @@ export function formatRole(type: string): string {
 export type SnapshotProvenance =
   | {
       backend: 'xctest';
-      producer: 'apple-runner' | 'simulator-ax-bridge' | 'appium-source' | 'limrun-ios-tree';
+      producer:
+        | 'apple-runner'
+        | 'simulator-ax-bridge'
+        | 'appium-source'
+        | 'limrun-ios-tree'
+        | 'doublespeed-ios-tree';
     }
   | { backend: 'android'; producer: 'android-uiautomator' | 'appium-source' }
   | { backend: 'harmonyos-arkui'; producer: 'harmonyos-uitest' }

diff --git a/packages/provider-doublespeed/README.md b/packages/provider-doublespeed/README.md
@@ -0,0 +1,16 @@
+# @agent-device/doublespeed
+
+Use Doublespeed iOS simulators with [agent-device](https://agent-device.dev).
+You need a Doublespeed account and its API credentials.
+
+```sh
+npm install -g agent-device
+agent-device plugins add @agent-device/doublespeed
+export DOUBLESPEED_API_KEY=your-api-key
+agent-device connect doublespeed --platform ios
+```
+
+See the [Doublespeed guide](https://agent-device.dev/docs/doublespeed) for setup and supported operations.
+To update the plugin, run `agent-device plugins update @agent-device/doublespeed`.
+
+After adding or updating a plugin, close your sessions and run `agent-device daemon stop` before reconnecting.
diff --git a/packages/provider-doublespeed/package.json b/packages/provider-doublespeed/package.json
@@ -0,0 +1,60 @@
+{
+  "name": "@agent-device/doublespeed",
+  "version": "0.21.22",
+  "private": false,
+  "type": "module",
+  "description": "Doublespeed iOS simulator plugin for agent-device.",
+  "exports": {
+    ".": {
+      "types": "./src/index.ts",
+      "default": "./src/index.ts"
+    },
+    "./connection-verification": {
+      "types": "./src/connection-verification.ts",
+      "default": "./src/connection-verification.ts"
+    },
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "tsdown --config tsdown.config.ts",
+    "prepack": "pnpm build"
+  },
+  "devDependencies": {
+    "@agent-device/capture-kit": "workspace:*",
+    "@agent-device/contracts": "workspace:*",
+    "@agent-device/kernel": "workspace:*",
+    "agent-device": "workspace:*"
+  },
+  "agentDevicePlugin": {
+    "apiVersion": 1,
+    "provider": "doublespeed",
+    "entry": "./dist/plugin.mjs",
+    "connection": {
+      "leaseKind": "direct-device-provider",
+      "requiresAppAttachment": false,
+      "requiresRemoteDaemon": false,
+      "supportsArtifacts": false,
+      "supportsDeferredAppSelection": true,
+      "supportsDirectPortReverse": false,
+      "usesCloudWebDriverLease": false
+    }
+  },
+  "publishConfig": {
+    "exports": {
+      ".": {
+        "import": "./dist/plugin.mjs"
+      }
+    },
+    "access": "public"
+  },
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/callstack/agent-device.git",
+    "directory": "packages/provider-doublespeed"
+  },
+  "homepage": "https://agent-device.dev/docs/doublespeed"
+}