diff --git a/build-mcpb.sh b/build-mcpb.sh
index ede0253..17b9f49 100755
--- a/build-mcpb.sh
+++ b/build-mcpb.sh
@@ -16,6 +16,19 @@ mv manifest.json.tmp manifest.json
 echo "Removing devDependencies and types from node_modules..."
 rm -rf node_modules
 npm ci --omit=dev --audit false --fund false
+
+# Install all sharp platform binaries for cross-platform support
+# (sharp uses optional deps that only install for current platform)
+# --force is needed to bypass platform checks for non-native packages
+# Note: darwin/linux need sharp-libvips-* for the libvips shared library,
+# win32 bundles libvips directly in the sharp package
+echo "Installing cross-platform sharp binaries..."
+npm install --no-save --force --audit false --fund false \
+  @img/sharp-darwin-arm64 @img/sharp-libvips-darwin-arm64 \
+  @img/sharp-darwin-x64 @img/sharp-libvips-darwin-x64 \
+  @img/sharp-linux-x64 @img/sharp-libvips-linux-x64 \
+  @img/sharp-win32-x64
+
 find node_modules -name "*.ts" -type f -delete 2>/dev/null || true
 
 # Create the MCPB package
diff --git a/src/index.ts b/src/index.ts
index 6fd7e3b..4f32a2f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,19 @@
 #!/usr/bin/env node
+import {execSync} from 'node:child_process';
+import {dirname} from 'node:path';
+import {fileURLToPath} from 'node:url';
+
+// Clear macOS quarantine attributes from native binaries before importing them
+// This is needed for MCPB packages downloaded from the internet
+if (process.platform === 'darwin') {
+	try {
+		const projectRoot = dirname(dirname(fileURLToPath(import.meta.url)));
+		execSync(`xattr -cr "${projectRoot}/node_modules"`, {stdio: 'ignore'});
+	} catch {
+		// Ignore errors - xattr may not exist or may fail on some files
+	}
+}
+
 import {StdioServerTransport} from '@modelcontextprotocol/sdk/server/stdio.js';
 import {server} from './server.js';