feat: add --manifest-version option to init command

Allow developers to specify which manifest version to use when
initializing a new manifest.json file.

Usage: mcpb init --manifest-version 0.3

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/cli/cli.ts

@@ -51,19 +51,29 @@ program
   .command("init [directory]")
   .description("Create a new MCPB extension manifest")
   .option("-y, --yes", "Accept all defaults (non-interactive mode)")
-  .action((directory?: string, options?: { yes?: boolean }) => {
-    void (async () => {
-      try {
-        const success = await initExtension(directory, options?.yes);
-        process.exit(success ? 0 : 1);
-      } catch (error) {
-        console.error(
-          `ERROR: ${error instanceof Error ? error.message : "Unknown error"}`,
-        );
-        process.exit(1);
-      }
-    })();
-  });
+  .option(
+    "--manifest-version <version>",
+    "Manifest version to use in the generated manifest",
+  )
+  .action(
+    (directory?: string, options?: { yes?: boolean; manifestVersion?: string }) => {
+      void (async () => {
+        try {
+          const success = await initExtension(
+            directory,
+            options?.yes,
+            options?.manifestVersion,
+          );
+          process.exit(success ? 0 : 1);
+        } catch (error) {
+          console.error(
+            `ERROR: ${error instanceof Error ? error.message : "Unknown error"}`,
+          );
+          process.exit(1);
+        }
+      })();
+    },
+  );
 
 // Validate command
 program

src/cli/init.ts

@@ -1,12 +1,12 @@
 import { confirm, input, select } from "@inquirer/prompts";
 import { existsSync, readFileSync, writeFileSync } from "fs";
 import { basename, join, resolve } from "path";
-import type { z } from "zod";
 
-// Import the schema for DEFAULT_MANIFEST_VERSION
-// TODO: Allow dynamic manifest version choice
-import type { McpbManifestSchema } from "../schemas/0.2.js";
-import { DEFAULT_MANIFEST_VERSION } from "../shared/constants.js";
+import {
+  DEFAULT_MANIFEST_VERSION,
+  MANIFEST_SCHEMAS,
+} from "../shared/constants.js";
+import type { McpbManifestAny } from "../types.js";
 
 interface PackageJson {
   name?: string;
@@ -877,18 +877,19 @@ export function buildManifest(
     license: string;
     repository?: { type: string; url: string };
   },
+  manifestVersion: keyof typeof MANIFEST_SCHEMAS = DEFAULT_MANIFEST_VERSION,
   // localization?: {
   //   resources: string;
   //   default_locale: string;
   // },
-): z.infer<typeof McpbManifestSchema> {
+): McpbManifestAny {
   const { name, displayName, version, description, authorName } = basicInfo;
   const { authorEmail, authorUrl } = authorInfo;
   const { serverType, entryPoint, mcp_config } = serverConfig;
   const { keywords, license, repository } = optionalFields;
 
   return {
-    manifest_version: DEFAULT_MANIFEST_VERSION,
+    manifest_version: manifestVersion,
     name,
     ...(displayName && displayName !== name
       ? { display_name: displayName }
@@ -945,10 +946,21 @@ export function printNextSteps() {
 export async function initExtension(
   targetPath: string = process.cwd(),
   nonInteractive = false,
+  manifestVersion?: string,
 ): Promise<boolean> {
   const resolvedPath = resolve(targetPath);
   const manifestPath = join(resolvedPath, "manifest.json");
 
+  // Validate manifest version if provided
+  if (manifestVersion && !(manifestVersion in MANIFEST_SCHEMAS)) {
+    console.error(
+      `ERROR: Invalid manifest version "${manifestVersion}". Supported versions: ${Object.keys(MANIFEST_SCHEMAS).join(", ")}`,
+    );
+    return false;
+  }
+  const effectiveManifestVersion = (manifestVersion ||
+    DEFAULT_MANIFEST_VERSION) as keyof typeof MANIFEST_SCHEMAS;
+
   if (existsSync(manifestPath)) {
     if (nonInteractive) {
       console.log(
@@ -1029,6 +1041,7 @@ export async function initExtension(
       compatibility,
       userConfig,
       optionalFields,
+      effectiveManifestVersion,
     );
 
     // Write manifest