fix: address PR review feedback

- Enable compression for introspect responses (large schema payload)
- Use cross-platform Node.js script instead of mkdir -p
- Add integration test for pre-initialize introspect.commands

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: raman325

package.json

@@ -36,7 +36,7 @@
     "lint": "eslint",
     "lint:fix": "eslint --fix && prettier -w .",
     "test": "npm run generate:schema && prettier --check src && tsc --noEmit && npm run lint && tsx src/test/integration.ts",
-    "generate:schema": "mkdir -p src/lib/generated && ts-json-schema-generator --path src/lib/incoming_message.ts --type IncomingMessage --tsconfig tsconfig.json --no-type-check --out src/lib/generated/incoming_message_schema.json",
+    "generate:schema": "node -e \"require('fs').mkdirSync('src/lib/generated',{recursive:true})\" && ts-json-schema-generator --path src/lib/incoming_message.ts --type IncomingMessage --tsconfig tsconfig.json --no-type-check --out src/lib/generated/incoming_message_schema.json",
     "prebuild": "npm run generate:schema",
     "build": "tsc -p .",
     "postbuild": "esm2cjs --in dist-esm --out dist-cjs -l error -t node20",

src/lib/server.ts

@@ -202,6 +202,7 @@ export class Client {
         return this.sendResultSuccess(
           msg.messageId,
           await this.instanceHandlers[instance].handle(msg),
+          instance === Instance.introspect,
         );
       }
 

src/test/integration.ts

@@ -56,6 +56,24 @@ const runTest = async () => {
       type: "version",
     });
 
+    // Test introspect.commands works before initialize
+    socket.send(
+      JSON.stringify({
+        command: "introspect.commands",
+        messageId: "introspect",
+      }),
+    );
+
+    const introspectResult = (await nextMessage()) as any;
+    assert.strictEqual(introspectResult.type, "result");
+    assert.strictEqual(introspectResult.success, true);
+    assert.strictEqual(introspectResult.messageId, "introspect");
+    assert.ok(introspectResult.result.definitions, "schema has definitions");
+    assert.ok(
+      introspectResult.result.anyOf || introspectResult.result.$ref,
+      "schema has anyOf or $ref at root",
+    );
+
     socket.send(
       JSON.stringify({
         command: "initialize",