diff --git a/package.json b/package.json
index 07a73591..1460e512 100644
--- a/package.json
+++ b/package.json
@@ -3,8 +3,8 @@
   "version": "2.3.0",
   "author": "Google Inc.",
   "description": "Stackdriver Debug Agent for Node.js",
-  "main": "./build/src/index.js",
-  "types": "./build/types/index.d.ts",
+  "main": "./build/src/index",
+  "types": "./build/src/index.d.ts",
   "repository": "googlecloudplatform/cloud-debug-nodejs",
   "keywords": [
     "google",
@@ -81,7 +81,7 @@
     "test": "./bin/run-test.sh",
     "check": "gts check",
     "clean": "gts clean",
-    "precompile": "npm run compile-scripts && node build/scripts/setup-test.js",
+    "precompile": "npm run compile-scripts && node build/scripts/setup-build-dir.js",
     "compile": "tsc -p .",
     "compile-scripts": "tsc -p scripts-tsconfig.json",
     "fix": "gts fix",
@@ -93,7 +93,6 @@
     "CHANGELOG.md",
     "LICENSE",
     "README.md",
-    "build/src",
-    "build/types"
+    "build/src"
   ]
 }
diff --git a/scripts/setup-test.ts b/scripts/setup-build-dir.ts
similarity index 86%
rename from scripts/setup-test.ts
rename to scripts/setup-build-dir.ts
index db6ab684..3ed4bede 100644
--- a/scripts/setup-test.ts
+++ b/scripts/setup-build-dir.ts
@@ -32,12 +32,20 @@ const SYSTEM_TEST = 'system-test';
 const PROJECT_ROOT = path.join(__dirname, '..', '..');
 const BUILD_DIR = path.join(PROJECT_ROOT, 'build');
 
+const INPUT_TYPES_DIR = path.join(PROJECT_ROOT, 'src', 'types');
+const OUTPUT_TYPES_DIR = path.join(BUILD_DIR, 'src', 'types');
+
 const INPUT_TEST_DIR = path.join(PROJECT_ROOT, TEST);
 const INPUT_SYSTEM_TEST_DIR = path.join(PROJECT_ROOT, SYSTEM_TEST);
 
 const OUTPUT_TEST_DIR = path.join(BUILD_DIR, TEST);
 const OUTPUT_SYSTEM_TEST_DIR = path.join(BUILD_DIR, SYSTEM_TEST);
 
+async function copyTypes(): Promise<void> {
+  await mkdirp(OUTPUT_TYPES_DIR);
+  await ncp(INPUT_TYPES_DIR, OUTPUT_TYPES_DIR);
+}
+
 async function setupUnitTests(): Promise<void> {
   await mkdirp(OUTPUT_TEST_DIR);
   await ncp(INPUT_TEST_DIR, OUTPUT_TEST_DIR);
@@ -50,6 +58,7 @@ async function setupSystemTests(): Promise<void> {
 
 async function main(): Promise<void> {
   try {
+    await copyTypes();
     await setupUnitTests();
     await setupSystemTests();
   }
diff --git a/src/agent/config.ts b/src/agent/config.ts
index 793a7d12..b2c5f642 100644
--- a/src/agent/config.ts
+++ b/src/agent/config.ts
@@ -16,7 +16,11 @@
 
 import * as common from '../types/common';
 
-export interface DebugAgentConfig extends common.AuthenticationConfig {
+export type DebugAgentConfig = {
+  [K in keyof ResolvedDebugAgentConfig]?: Partial<ResolvedDebugAgentConfig[K]>
+};
+
+export interface ResolvedDebugAgentConfig extends common.AuthenticationConfig {
   workingDirectory: string;
 
   /**
@@ -166,7 +170,7 @@ export interface StackdriverConfig extends common.AuthenticationConfig {
   debug?: DebugAgentConfig;
 }
 
-export const defaultConfig: DebugAgentConfig = {
+export const defaultConfig: ResolvedDebugAgentConfig = {
   // FIXME(ofrobots): presently this is dependent what cwd() is at the time this
   // file is first required. We should make the default config static.
   workingDirectory: process.cwd(),
diff --git a/src/agent/debuglet.ts b/src/agent/debuglet.ts
index b18c8f35..5b143dfe 100644
--- a/src/agent/debuglet.ts
+++ b/src/agent/debuglet.ts
@@ -46,7 +46,7 @@ import * as debugapi from './v8/debugapi';
 import * as assert from 'assert';
 
 import * as stackdriver from '../types/stackdriver';
-import {DebugAgentConfig} from './config';
+import {DebugAgentConfig, ResolvedDebugAgentConfig} from './config';
 import {Debug, PackageInfo} from '../client/stackdriver/debug';
 import {Logger} from '../types/common';
 import {DebugApi} from './v8/debugapi';
@@ -179,7 +179,7 @@ export class Debuglet extends EventEmitter {
   isReadyManager: IsReady = new IsReadyImpl(this);
 
   // Exposed for testing
-  config: DebugAgentConfig;
+  config: ResolvedDebugAgentConfig;
   fetcherActive: boolean;
   logger: Logger;
   debuggee: Debuggee|null;
@@ -244,7 +244,7 @@ export class Debuglet extends EventEmitter {
     this.debuggeeRegistered = new CachedPromise();
   }
 
-  static normalizeConfig_(config: DebugAgentConfig): DebugAgentConfig {
+  static normalizeConfig_(config: DebugAgentConfig): ResolvedDebugAgentConfig {
     const envConfig = {
       logLevel: process.env.GCLOUD_DEBUG_LOGLEVEL,
       serviceContext: {
diff --git a/src/agent/state/inspector-state.ts b/src/agent/state/inspector-state.ts
index 4c443d59..f74182d7 100644
--- a/src/agent/state/inspector-state.ts
+++ b/src/agent/state/inspector-state.ts
@@ -27,7 +27,7 @@ const isEmpty = lodash.isEmpty;
 import {StatusMessage} from '../../client/stackdriver/status-message';
 
 import * as stackdriver from '../../types/stackdriver';
-import {DebugAgentConfig} from '../config';
+import {ResolvedDebugAgentConfig} from '../config';
 import {V8Inspector} from '../v8/v8inspector';
 
 const assert = debugAssert(!!process.env.CLOUD_DEBUG_ASSERTIONS);
@@ -79,7 +79,7 @@ class StateResolver {
   private callFrames: inspector.Debugger.CallFrame[];
   private v8Inspector: V8Inspector;
   private expressions: string[]|undefined;
-  private config: DebugAgentConfig;
+  private config: ResolvedDebugAgentConfig;
   private scriptmapper: {[id: string]: {url: string}};
   private breakpoint: stackdriver.Breakpoint;
   private evaluatedExpressions: stackdriver.Variable[];
@@ -96,7 +96,7 @@ class StateResolver {
    */
   constructor(
       callFrames: inspector.Debugger.CallFrame[],
-      breakpoint: stackdriver.Breakpoint, config: DebugAgentConfig,
+      breakpoint: stackdriver.Breakpoint, config: ResolvedDebugAgentConfig,
       scriptmapper: {[id: string]: {url: string}}, v8Inspector: V8Inspector) {
     this.callFrames = callFrames;
     this.breakpoint = breakpoint;
@@ -552,7 +552,7 @@ export function testAssert(): void {
  */
 export function capture(
     callFrames: inspector.Debugger.CallFrame[],
-    breakpoint: stackdriver.Breakpoint, config: DebugAgentConfig,
+    breakpoint: stackdriver.Breakpoint, config: ResolvedDebugAgentConfig,
     scriptmapper: {[id: string]: {url: string}},
     v8Inspector: V8Inspector): stackdriver.Breakpoint {
   return (new StateResolver(
diff --git a/src/agent/state/legacy-state.ts b/src/agent/state/legacy-state.ts
index 3a759a59..96f4e2aa 100644
--- a/src/agent/state/legacy-state.ts
+++ b/src/agent/state/legacy-state.ts
@@ -27,7 +27,7 @@ import {StatusMessage} from '../../client/stackdriver/status-message';
 
 import * as v8 from '../../types/v8';
 import * as stackdriver from '../../types/stackdriver';
-import {DebugAgentConfig} from '../config';
+import {ResolvedDebugAgentConfig} from '../config';
 
 // TODO: Determine if `ScopeType` should be named `scopeType`.
 // tslint:disable-next-line:variable-name
@@ -72,7 +72,7 @@ export function evaluate(expression: string, frame: v8.FrameMirror):
 class StateResolver {
   private state: v8.ExecutionState;
   private expressions: string[];
-  private config: DebugAgentConfig;
+  private config: ResolvedDebugAgentConfig;
   private ctx: v8.Debug;
   private evaluatedExpressions: stackdriver.Variable[];
   private totalSize: number;
@@ -88,7 +88,7 @@ class StateResolver {
    */
   constructor(
       execState: v8.ExecutionState, expressions: string[],
-      config: DebugAgentConfig, v8debug: v8.Debug) {
+      config: ResolvedDebugAgentConfig, v8debug: v8.Debug) {
     this.state = execState;
     this.expressions = expressions;
     this.config = config;
@@ -565,7 +565,8 @@ export function testAssert(): void {
  */
 export function capture(
     execState: v8.ExecutionState, expressions: string[],
-    config: DebugAgentConfig, v8debug: v8.Debug): stackdriver.Breakpoint {
+    config: ResolvedDebugAgentConfig,
+    v8debug: v8.Debug): stackdriver.Breakpoint {
   return (new StateResolver(execState, expressions, config, v8debug))
       .capture_();
 }
diff --git a/src/agent/v8/inspector-debugapi.ts b/src/agent/v8/inspector-debugapi.ts
index 6e3f7be9..ee64cd39 100644
--- a/src/agent/v8/inspector-debugapi.ts
+++ b/src/agent/v8/inspector-debugapi.ts
@@ -22,7 +22,7 @@ import * as path from 'path';
 import {StatusMessage} from '../../client/stackdriver/status-message';
 import {Logger} from '../../types/common';
 import * as stackdriver from '../../types/stackdriver';
-import {DebugAgentConfig} from '../config';
+import {ResolvedDebugAgentConfig} from '../config';
 import {FileStats, ScanStats} from '../io/scanner';
 import {MapInfoOutput, SourceMapper} from '../io/sourcemapper';
 import * as state from '../state/inspector-state';
@@ -41,7 +41,7 @@ export class BreakpointData {
 
 export class InspectorDebugApi implements debugapi.DebugApi {
   logger: Logger;
-  config: DebugAgentConfig;
+  config: ResolvedDebugAgentConfig;
   fileStats: ScanStats;
   breakpoints: {[id: string]: BreakpointData} = {};
   sourcemapper: SourceMapper;
@@ -60,7 +60,7 @@ export class InspectorDebugApi implements debugapi.DebugApi {
   numBreakpoints = 0;
   v8Inspector: V8Inspector;
   constructor(
-      logger: Logger, config: DebugAgentConfig, jsFiles: ScanStats,
+      logger: Logger, config: ResolvedDebugAgentConfig, jsFiles: ScanStats,
       sourcemapper: SourceMapper) {
     this.logger = logger;
     this.config = config;
diff --git a/src/agent/v8/legacy-debugapi.ts b/src/agent/v8/legacy-debugapi.ts
index 2ccfd6cd..b42c0704 100644
--- a/src/agent/v8/legacy-debugapi.ts
+++ b/src/agent/v8/legacy-debugapi.ts
@@ -25,7 +25,7 @@ import {StatusMessage} from '../../client/stackdriver/status-message';
 import {Logger} from '../../types/common';
 import * as stackdriver from '../../types/stackdriver';
 import * as v8 from '../../types/v8';
-import {DebugAgentConfig} from '../config';
+import {ResolvedDebugAgentConfig} from '../config';
 import {FileStats, ScanStats} from '../io/scanner';
 import {MapInfoOutput, SourceMapper} from '../io/sourcemapper';
 import * as state from '../state/legacy-state';
@@ -47,7 +47,7 @@ export class V8DebugApi implements debugapi.DebugApi {
   breakpoints: {[id: string]: V8BreakpointData} = {};
   sourcemapper: SourceMapper;
   v8: v8.Debug;
-  config: DebugAgentConfig;
+  config: ResolvedDebugAgentConfig;
   fileStats: ScanStats;
   listeners: {[id: string]: utils.Listener} = {};
   v8Version: RegExpExecArray|null;
@@ -60,7 +60,7 @@ export class V8DebugApi implements debugapi.DebugApi {
   numBreakpoints = 0;
 
   constructor(
-      logger: Logger, config: DebugAgentConfig, jsFiles: ScanStats,
+      logger: Logger, config: ResolvedDebugAgentConfig, jsFiles: ScanStats,
       sourcemapper: SourceMapper) {
     this.sourcemapper = sourcemapper;
     this.v8 = vm.runInDebugContext('Debug');
diff --git a/src/index.ts b/src/index.ts
index 8ff056e0..1ce2d219 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -35,7 +35,7 @@ let debuglet: Debuglet;
  * @example
  * debug.startAgent();
  */
-export function start(options: DebugAgentConfig|StackdriverConfig): Debuglet|
+export function start(options?: DebugAgentConfig|StackdriverConfig): Debuglet|
     IsReady {
   options = options || {};
   const agentConfig: DebugAgentConfig =
diff --git a/system-test/test-install.ts b/system-test/test-install.ts
index 39f6aad2..4d7fac09 100644
--- a/system-test/test-install.ts
+++ b/system-test/test-install.ts
@@ -17,7 +17,7 @@
 import * as assert from 'assert';
 import * as path from 'path';
 
-import {globP, ncpP, rimrafP, spawnP, tmpDirP, writeFileP} from './utils';
+import {globP, mkdirP, ncpP, rimrafP, spawnP, tmpDirP, writeFileP} from './utils';
 
 const INDEX_TS = 'index.ts';
 const INDEX_JS = 'index.js';
@@ -36,6 +36,36 @@ debug.start();`,
     code: `import * as debug from '@google-cloud/debug-agent';
 debug.start({ allowExpressions: true });`,
     description: 'imports the module and starts with {allowExpressions: true}'
+  },
+  {
+    code: `import * as debug from '@google-cloud/debug-agent';
+debug.start({
+  allowExpressions: true,
+  serviceContext: {
+    service: 'Some service'
+  }
+});`,
+    description: 'imports the module and starts with a partial `serviceContext`'
+  },
+  {
+    code: `import * as debug from '@google-cloud/debug-agent';
+debug.start({
+  allowExpressions: true,
+  serviceContext: {
+    service: 'Some service',
+    version: 'Some version'
+  }
+});`,
+    description: 'imports the module and starts with a complete `serviceContext`'
+  },
+  {
+    code: `import * as debug from '@google-cloud/debug-agent';
+debug.start({
+  capture: {
+    maxFrames: 1
+  }
+});`,
+    description: 'imports the module and starts with a partial `capture`'
   }
 ];
 
@@ -74,6 +104,17 @@ interface CodeSample {
 
 describe('Installation', () => {
   let installDir: string|undefined;
+  before(async () => {
+    const tgz = await globP(`${process.cwd()}/*.tgz`);
+    assert.deepStrictEqual(
+        tgz.length, 0,
+        `Expected zero tgz files in the current working directory before ` +
+            `running the test but found files: ${tgz.map(file => {
+              const parts = file.split(path.sep);
+              return parts[parts.length - 1];
+            })}`);
+  });
+
   beforeEach(async function() {
     this.timeout(TIMEOUT_MS);
     // This script assumes that you don't already have a TGZ file
@@ -103,17 +144,26 @@ describe('Installation', () => {
 
   describe('When used with Typescript code', () => {
     TS_CODE_ARRAY.forEach((sample) => {
-      it(`should install and work with code that ${sample.description}`,
-         async function() {
-           this.timeout(TIMEOUT_MS);
-           assert(installDir);
-           await writeFileP(
-               path.join(installDir!, INDEX_TS), sample.code, 'utf-8');
-           await spawnP(
-               `node_modules${path.sep}.bin${path.sep}tsc`, [INDEX_TS],
-               {cwd: installDir, stdio}, log);
-           await spawnP('node', [INDEX_JS], {cwd: installDir, stdio}, log);
-         });
+      it.only(
+          `should install and work with code that ${sample.description}`,
+          async function() {
+            this.timeout(TIMEOUT_MS);
+            assert(installDir);
+            const srcDir = path.join(installDir!, 'src');
+            await mkdirP(srcDir);
+            await writeFileP(path.join(srcDir, INDEX_TS), sample.code, 'utf-8');
+            await spawnP(
+                'npm', ['install', '--save-dev', 'gts', 'typescript@2.x'],
+                {cwd: installDir, stdio}, log);
+            await spawnP(
+                'gts', ['init', '--yes'], {cwd: installDir, stdio}, log);
+            await spawnP(
+                'npm', ['run', 'compile'], {cwd: installDir, stdio}, log);
+            const buildDir = path.join(installDir!, 'build');
+            await spawnP(
+                'node', [path.join(buildDir, 'src', INDEX_JS)],
+                {cwd: installDir, stdio}, log);
+          });
     });
   });
 
diff --git a/system-test/utils.ts b/system-test/utils.ts
index 5d1c1c80..cde803b1 100644
--- a/system-test/utils.ts
+++ b/system-test/utils.ts
@@ -15,7 +15,7 @@
  */
 
 import {ChildProcess, fork, ForkOptions, spawn, SpawnOptions} from 'child_process';
-import {readFile, stat, Stats, writeFile} from 'fs';
+import {mkdir, readFile, stat, Stats, writeFile} from 'fs';
 import * as glob from 'glob';
 import {ncp} from 'ncp';
 import * as once from 'once';
@@ -35,6 +35,8 @@ export const writeFileP: (path: string, data: string, encoding?: string) =>
 export const statP: (path: string) => Promise<Stats> = pify(stat);
 export const tmpDirP: () => Promise<string> = pify(tmp.dir);
 export const rimrafP: (f: string) => Promise<void> = pify(rimraf);
+export const mkdirP: (path: string, mode?: number) => Promise<void> =
+    pify(mkdir);
 
 export function nodule(nodule: string) {
   return path.relative(BUILD_DIRECTORY, `node_modules/${nodule}`);
diff --git a/test/test-v8debugapi.ts b/test/test-v8debugapi.ts
index 0953469d..772eeb05 100644
--- a/test/test-v8debugapi.ts
+++ b/test/test-v8debugapi.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {DebugAgentConfig} from '../src/agent/config';
+import {ResolvedDebugAgentConfig} from '../src/agent/config';
 import {DebugApi} from '../src/agent/v8/debugapi';
 import * as stackdriver from '../src/types/stackdriver';
 
@@ -113,7 +113,7 @@ function validateBreakpoint(breakpoint: stackdriver.Breakpoint): void {
   }
 }
 describe('debugapi selection', () => {
-  const config: DebugAgentConfig = extend(
+  const config: ResolvedDebugAgentConfig = extend(
       {}, defaultConfig, {workingDirectory: __dirname, forceNewAgent_: true});
   const logger =
       new common.logger({levelLevel: config.logLevel} as {} as LoggerOptions);
@@ -156,7 +156,7 @@ describe('debugapi selection', () => {
 });
 
 describe('v8debugapi', () => {
-  const config: DebugAgentConfig = extend(
+  const config: ResolvedDebugAgentConfig = extend(
       {}, defaultConfig, {workingDirectory: __dirname, forceNewAgent_: true});
   // TODO: It appears `logLevel` is a typo and should be `level`.  However,
   //       with this change, the tests fail.  Resolve this.