Send Devin Desktop Windsurf version instead of CLI build id.

src/metadata.ts

@@ -1,3 +1,4 @@
+import { existsSync, readFileSync } from "node:fs";
 import {
   encodeMessage,
   encodeString,
@@ -5,7 +6,30 @@ import {
   encodeVarintField,
 } from "./wire.js";
 
-const DEFAULT_VERSION = "3000.4.25";
+/**
+ * Cognition version-gates GetChatMessage against a known Windsurf/Devin Desktop
+ * release. The Devin CLI build id (`3000.4.25`) is not that string and the
+ * server answers: "Your Windsurf version is out of date."
+ * Prefer the installed Devin.app product.json, then a current desktop release.
+ */
+const FALLBACK_WINDSURF_VERSION = "3.6.27";
+const PRODUCT_JSON =
+  "/Applications/Devin.app/Contents/Resources/app/product.json";
+
+function desktopWindsurfVersion(): string {
+  try {
+    if (!existsSync(PRODUCT_JSON)) return FALLBACK_WINDSURF_VERSION;
+    const product = JSON.parse(readFileSync(PRODUCT_JSON, "utf8")) as {
+      windsurfVersion?: string;
+    };
+    return product.windsurfVersion || FALLBACK_WINDSURF_VERSION;
+  } catch {
+    return FALLBACK_WINDSURF_VERSION;
+  }
+}
+
+export const CLIENT_VERSION = desktopWindsurfVersion();
+export const CLIENT_IDE = "windsurf";
 
 export interface MetadataInput {
   apiKey: string;
@@ -14,10 +38,12 @@ export interface MetadataInput {
   requestId: bigint;
   triggerId: string;
   version?: string;
+  ide?: string;
 }
 
 export function buildMetadata(input: MetadataInput): Buffer {
-  const version = input.version ?? DEFAULT_VERSION;
+  const version = input.version ?? CLIENT_VERSION;
+  const ide = input.ide ?? CLIENT_IDE;
   const os =
     process.platform === "darwin"
       ? "darwin"
@@ -25,7 +51,7 @@ export function buildMetadata(input: MetadataInput): Buffer {
         ? "windows"
         : "linux";
   const parts: Buffer[] = [
-    encodeString(1, "devin"),
+    encodeString(1, ide),
     encodeString(2, version),
     encodeString(3, input.apiKey),
     encodeString(4, "en"),
@@ -33,11 +59,11 @@ export function buildMetadata(input: MetadataInput): Buffer {
     encodeString(7, version),
     encodeVarintField(9, input.requestId),
     encodeString(10, input.sessionId),
-    encodeString(12, "devin"),
+    encodeString(12, ide),
     encodeMessage(16, encodeTimestampBody()),
     encodeString(25, input.triggerId),
     encodeString(26, "Unset"),
-    encodeString(28, "devin"),
+    encodeString(28, ide),
   ];
   if (input.userJwt) parts.push(encodeString(21, input.userJwt));
   return Buffer.concat(parts);