diff --git a/package-lock.json b/package-lock.json
index 218c4bd4..da0c525a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25659,6 +25659,12 @@
         "zone.js": "~0.14.0"
       }
     },
+    "packages/@apphosting/adapter-angular/node_modules/@apphosting/common": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/@apphosting/common/-/common-0.0.2.tgz",
+      "integrity": "sha512-ab+vq1ntGo1YoKvyYRptkQt3QE86dg+tSZYFSCt9ovEtFjV/zepOGW8hvhnWLpNGErcyE7f2cExySOiLZW/ZPQ==",
+      "license": "Apache-2.0"
+    },
     "packages/@apphosting/adapter-angular/node_modules/ansi-regex": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.0.1.tgz",
@@ -25727,6 +25733,12 @@
         }
       }
     },
+    "packages/@apphosting/adapter-nextjs/node_modules/@apphosting/common": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/@apphosting/common/-/common-0.0.2.tgz",
+      "integrity": "sha512-ab+vq1ntGo1YoKvyYRptkQt3QE86dg+tSZYFSCt9ovEtFjV/zepOGW8hvhnWLpNGErcyE7f2cExySOiLZW/ZPQ==",
+      "license": "Apache-2.0"
+    },
     "packages/@apphosting/build": {
       "version": "0.1.0",
       "license": "Apache-2.0",
@@ -25800,7 +25812,7 @@
       }
     },
     "packages/@apphosting/common": {
-      "version": "0.0.2",
+      "version": "0.0.3",
       "license": "Apache-2.0"
     },
     "packages/@apphosting/create": {
diff --git a/packages/@apphosting/common/package.json b/packages/@apphosting/common/package.json
index 819f0561..b598da48 100644
--- a/packages/@apphosting/common/package.json
+++ b/packages/@apphosting/common/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@apphosting/common",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "Shared library code for App Hosting framework adapters",
   "author": {
     "name": "Firebase",
diff --git a/packages/@apphosting/common/src/index.ts b/packages/@apphosting/common/src/index.ts
index ac24ac95..0ac67445 100644
--- a/packages/@apphosting/common/src/index.ts
+++ b/packages/@apphosting/common/src/index.ts
@@ -1,5 +1,59 @@
 import { spawn } from "child_process";
 
+// Output bundle metadata specifications to be written to bundle.yaml
+export interface OutputBundleConfig {
+  version: "v1";
+  serverConfig: ServerConfig;
+  metadata: Metadata;
+}
+
+// Fields needed to configure the App Hosting server
+interface ServerConfig {
+  // Command to start the server (e.g. "node dist/index.js"). Assume this command is run from the root dir of the workspace
+  runCommand: string;
+  // Environment variables set when the app is run
+  environmentVariables?: EnvVarConfig[];
+  // See https://firebase.google.com/docs/reference/apphosting/rest/v1beta/projects.locations.backends.builds#runconfig for documentation on the next fields
+  // The maximum number of concurrent requests that each server instance can receive.
+  concurrency?: number;
+  // The number of CPUs used in a single server instance.
+  cpu?: number;
+  // The amount of memory available for a server instance.
+  memoryMiB?: number;
+  // The limit on the minimum number of function instances that may coexist at a given time.
+  minInstances?: number;
+  // The limit on the maximum number of function instances that may coexist at a given time.
+  maxInstances?: number;
+}
+
+// Additonal fields needed for identifying the framework and adapter being used
+interface Metadata {
+  // Name of the adapter (this should be the official package name) e.g. "@apphosting/adapter-nextjs"
+  adapterPackageName: string;
+  // Version of the adapter, e.g. "18.0.1"
+  adapterVersion: string;
+  // Name of the framework that is being supported, e.g. "angular"
+  framework: string;
+  // Version of the framework that is being supported, e.g. "18.0.1"
+  frameworkVersion?: string;
+}
+
+// Represents a single environment variable.
+interface EnvVarConfig {
+  // Name of the variable
+  variable: string;
+  // Value associated with the variable
+  value: string;
+  // Where the variable will be available, for now only RUNTIME is supported
+  availability: Availability.Runtime[];
+}
+
+// Represents where environment variables are made available
+enum Availability {
+  // Runtime environment variables are available on the server when the app is run
+  Runtime,
+}
+
 // Options to configure the build of a framework application
 export interface BuildOptions {
   // command to run build script (e.g. "npm", "nx", etc.)