diff --git a/packages/targets/mobile-expo/src/index.test.ts b/packages/targets/mobile-expo/src/index.test.ts
index 78bf41bd..82784237 100644
--- a/packages/targets/mobile-expo/src/index.test.ts
+++ b/packages/targets/mobile-expo/src/index.test.ts
@@ -1,4 +1,167 @@
-import { smokeTest } from '@profullstack/sh1pt-core/testing';
+import { fakeBuildContext, fakeShipContext, makeVault, smokeTest } from '@profullstack/sh1pt-core/testing';
+import { mkdtemp, readFile, rm } from 'node:fs/promises';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+const { execMock } = vi.hoisted(() => ({
+  execMock: vi.fn(),
+}));
+
+vi.mock('@profullstack/sh1pt-core', async () => ({
+  ...await vi.importActual<typeof import('@profullstack/sh1pt-core')>('@profullstack/sh1pt-core'),
+  exec: execMock,
+}));
+
 import adapter from './index.js';
 
 smokeTest(adapter, { idPrefix: 'mobile', requireKind: true });
+
+const tempDirs: string[] = [];
+
+beforeEach(() => {
+  vi.clearAllMocks();
+});
+
+afterEach(async () => {
+  await Promise.all(tempDirs.splice(0).map((dir) => rm(dir, { recursive: true, force: true })));
+});
+
+describe('mobile-expo target adapter', () => {
+  it('writes an EAS package plan without invoking the CLI in dry-run builds', async () => {
+    const outDir = await mkdtemp(join(tmpdir(), 'sh1pt-expo-out-'));
+    const projectDir = await mkdtemp(join(tmpdir(), 'sh1pt-expo-project-'));
+    tempDirs.push(outDir, projectDir);
+
+    const result = await adapter.build(fakeBuildContext({
+      outDir,
+      projectDir,
+      version: '1.2.3',
+      channel: 'beta',
+      dryRun: true,
+    }) as any, {
+      appId: '@acme/mobile-app',
+      platform: 'ios',
+      profile: 'internal',
+    });
+
+    expect(execMock).not.toHaveBeenCalled();
+    expect(result.artifact).toBe(join(outDir, 'acme-mobile-app-1.2.3.eas-plan.json'));
+    const plan = JSON.parse(await readFile(result.artifact, 'utf-8'));
+    expect(plan).toEqual({
+      provider: 'expo-eas',
+      appId: '@acme/mobile-app',
+      version: '1.2.3',
+      channel: 'beta',
+      platform: 'ios',
+      profile: 'internal',
+      projectDir,
+      build: {
+        command: 'eas',
+        args: ['build', '--platform', 'ios', '--profile', 'internal', '--non-interactive', '--json'],
+        cwd: projectDir,
+      },
+      metadataArtifact: join(outDir, 'acme-mobile-app-1.2.3.eas-build.json'),
+    });
+  });
+
+  it('runs EAS with argv args and writes build metadata for real builds', async () => {
+    execMock.mockResolvedValue({ exitCode: 0, stdout: '{"buildId":"abc"}\n', stderr: '' });
+
+    const outDir = await mkdtemp(join(tmpdir(), 'sh1pt-expo-out-'));
+    const projectDir = await mkdtemp(join(tmpdir(), 'sh1pt-expo-project-'));
+    tempDirs.push(outDir, projectDir);
+
+    const ctx = fakeBuildContext({
+      outDir,
+      projectDir,
+      version: '1.2.3',
+      channel: 'stable',
+      dryRun: false,
+      secret: makeVault({ EXPO_TOKEN: 'expo-token' }),
+    });
+    const result = await adapter.build(ctx as any, {
+      appId: 'acme-mobile',
+      platform: 'android',
+    });
+
+    const artifact = join(outDir, 'acme-mobile-1.2.3.eas-build.json');
+    expect(execMock).toHaveBeenCalledWith('eas', [
+      'build',
+      '--platform',
+      'android',
+      '--profile',
+      'production',
+      '--non-interactive',
+      '--json',
+    ], {
+      cwd: projectDir,
+      env: { EXPO_TOKEN: 'expo-token' },
+      log: ctx.log,
+      throwOnNonZero: true,
+    });
+    expect(result).toEqual({ artifact });
+    expect(await readFile(artifact, 'utf-8')).toBe('{"buildId":"abc"}\n');
+  });
+
+  it('returns the planned EAS update command for dry-run ships', async () => {
+    const ctx = fakeShipContext({
+      projectDir: '/tmp/expo-app',
+      version: '1.2.3',
+      channel: 'canary',
+      dryRun: true,
+    });
+
+    const result = await adapter.ship(ctx as any, {
+      appId: 'acme-mobile',
+    });
+
+    expect(execMock).not.toHaveBeenCalled();
+    expect(result).toEqual({
+      id: 'dry-run',
+      meta: {
+        command: {
+          command: 'eas',
+          args: ['update', '--channel', 'canary', '--non-interactive'],
+          cwd: '/tmp/expo-app',
+        },
+      },
+    });
+  });
+
+  it('runs EAS submit with argv args for real submit ships', async () => {
+    execMock.mockResolvedValue({ exitCode: 0, stdout: '', stderr: '' });
+    const ctx = fakeShipContext({
+      projectDir: '/tmp/expo-app',
+      version: '1.2.3',
+      channel: 'stable',
+      dryRun: false,
+      secret: makeVault({ EXPO_TOKEN: 'expo-token' }),
+    });
+
+    const result = await adapter.ship(ctx as any, {
+      appId: 'acme-mobile',
+      platform: 'ios',
+      profile: 'production',
+      submit: true,
+    });
+
+    expect(execMock).toHaveBeenCalledWith('eas', [
+      'submit',
+      '--platform',
+      'ios',
+      '--profile',
+      'production',
+      '--non-interactive',
+    ], {
+      cwd: '/tmp/expo-app',
+      env: { EXPO_TOKEN: 'expo-token' },
+      log: ctx.log,
+      throwOnNonZero: true,
+    });
+    expect(result).toEqual({
+      id: 'acme-mobile@1.2.3',
+      url: 'https://expo.dev/accounts/acme-mobile',
+    });
+  });
+});
diff --git a/packages/targets/mobile-expo/src/index.ts b/packages/targets/mobile-expo/src/index.ts
index 700d292d..74b67db2 100644
--- a/packages/targets/mobile-expo/src/index.ts
+++ b/packages/targets/mobile-expo/src/index.ts
@@ -1,4 +1,6 @@
-import { defineTarget, manualSetup } from '@profullstack/sh1pt-core';
+import { defineTarget, exec, manualSetup } from '@profullstack/sh1pt-core';
+import { mkdir, writeFile } from 'node:fs/promises';
+import { join } from 'node:path';
 
 interface Config {
   appId: string;
@@ -7,21 +9,141 @@ interface Config {
   submit?: boolean;
 }
 
+interface EasCommand {
+  command: 'eas';
+  args: string[];
+  cwd: string;
+}
+
+interface ExpoBuildPlan {
+  provider: 'expo-eas';
+  appId: string;
+  version: string;
+  channel: string;
+  platform: 'ios' | 'android' | 'all';
+  profile: string;
+  projectDir: string;
+  build: EasCommand;
+  metadataArtifact: string;
+}
+
+interface ExpoShipPlan {
+  provider: 'expo-eas';
+  appId: string;
+  version: string;
+  channel: string;
+  platform: 'ios' | 'android' | 'all';
+  profile: string;
+  action: 'submit' | 'update';
+  projectDir: string;
+  command: EasCommand;
+}
+
+function platform(config: Config): 'ios' | 'android' | 'all' {
+  return config.platform ?? 'all';
+}
+
+function profile(ctx: { channel: string }, config: Config): string {
+  return config.profile ?? (ctx.channel === 'stable' ? 'production' : 'preview');
+}
+
+function safeFileStem(value: string): string {
+  return value.replace(/[^a-zA-Z0-9._-]+/g, '-').replace(/^-|-$/g, '') || 'expo-app';
+}
+
+function buildMetadataPath(ctx: { outDir: string; version: string }, config: Config): string {
+  return join(ctx.outDir, `${safeFileStem(config.appId)}-${safeFileStem(ctx.version)}.eas-build.json`);
+}
+
+function buildPlan(
+  ctx: { projectDir: string; outDir: string; version: string; channel: string },
+  config: Config,
+): ExpoBuildPlan {
+  const selectedPlatform = platform(config);
+  const selectedProfile = profile(ctx, config);
+  return {
+    provider: 'expo-eas',
+    appId: config.appId,
+    version: ctx.version,
+    channel: ctx.channel,
+    platform: selectedPlatform,
+    profile: selectedProfile,
+    projectDir: ctx.projectDir,
+    build: {
+      command: 'eas',
+      args: ['build', '--platform', selectedPlatform, '--profile', selectedProfile, '--non-interactive', '--json'],
+      cwd: ctx.projectDir,
+    },
+    metadataArtifact: buildMetadataPath(ctx, config),
+  };
+}
+
+function shipPlan(
+  ctx: { projectDir: string; version: string; channel: string },
+  config: Config,
+): ExpoShipPlan {
+  const selectedPlatform = platform(config);
+  const selectedProfile = profile(ctx, config);
+  const action = config.submit ? 'submit' : 'update';
+  const args = config.submit
+    ? ['submit', '--platform', selectedPlatform, '--profile', selectedProfile, '--non-interactive']
+    : ['update', '--channel', ctx.channel, '--non-interactive'];
+
+  return {
+    provider: 'expo-eas',
+    appId: config.appId,
+    version: ctx.version,
+    channel: ctx.channel,
+    platform: selectedPlatform,
+    profile: selectedProfile,
+    action,
+    projectDir: ctx.projectDir,
+    command: {
+      command: 'eas',
+      args,
+      cwd: ctx.projectDir,
+    },
+  };
+}
+
+function expoEnv(ctx: { secret(key: string): string | undefined }): Record<string, string | undefined> {
+  return { EXPO_TOKEN: ctx.secret('EXPO_TOKEN') };
+}
+
 export default defineTarget<Config>({
   id: 'mobile-expo',
   kind: 'mobile',
   label: 'Expo / EAS',
   async build(ctx, config) {
-    const platform = config.platform ?? 'all';
-    const profile = config.profile ?? (ctx.channel === 'stable' ? 'production' : 'preview');
-    ctx.log(`eas build --platform ${platform} --profile ${profile}`);
-    return { artifact: `${ctx.outDir}/expo-eas-build` };
+    const plan = buildPlan(ctx, config);
+    ctx.log(`eas build --platform ${plan.platform} --profile ${plan.profile}`);
+    await mkdir(ctx.outDir, { recursive: true });
+
+    if (ctx.dryRun) {
+      const planPath = join(ctx.outDir, `${safeFileStem(config.appId)}-${safeFileStem(ctx.version)}.eas-plan.json`);
+      await writeFile(planPath, `${JSON.stringify(plan, null, 2)}\n`, 'utf-8');
+      return { artifact: planPath, meta: { command: plan.build, metadataArtifact: plan.metadataArtifact } };
+    }
+
+    const result = await exec(plan.build.command, plan.build.args, {
+      cwd: plan.build.cwd,
+      env: expoEnv(ctx),
+      log: ctx.log,
+      throwOnNonZero: true,
+    });
+    await writeFile(plan.metadataArtifact, result.stdout || '{}\n', 'utf-8');
+    return { artifact: plan.metadataArtifact };
   },
   async ship(ctx, config) {
-    const platform = config.platform ?? 'all';
-    const profile = config.profile ?? (ctx.channel === 'stable' ? 'production' : 'preview');
-    ctx.log(config.submit ? `eas submit --platform ${platform} --profile ${profile}` : `eas update --channel ${ctx.channel}`);
-    if (ctx.dryRun) return { id: 'dry-run' };
+    const plan = shipPlan(ctx, config);
+    ctx.log(config.submit ? `eas submit --platform ${plan.platform} --profile ${plan.profile}` : `eas update --channel ${ctx.channel}`);
+    if (ctx.dryRun) return { id: 'dry-run', meta: { command: plan.command } };
+    await exec(plan.command.command, plan.command.args, {
+      cwd: plan.command.cwd,
+      env: expoEnv(ctx),
+      log: ctx.log,
+      throwOnNonZero: true,
+    });
     return { id: `${config.appId}@${ctx.version}`, url: `https://expo.dev/accounts/${config.appId}` };
   },
   setup: manualSetup({