Handle mentioned apps via smart context (#1412)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Send mentioned apps (names + files) to the engine through
dyad_options, omit inline other-apps prefix when engine is enabled, and
adjust e2e to snapshot request payload.
> 
> - **Engine/Backend**:
> - Pass mentioned apps to engine via
`providerOptions['dyad-engine'].dyadMentionedApps` and forward as
`dyad_options.mentioned_apps` in `llm_engine_provider`.
> - Gate inline other-apps context: only include `otherCodebasePrefix`
when `isEngineEnabled` is false.
> - Enhance `extractMentionedAppsCodebases` to return `files` alongside
`codebaseInfo`.
> - **Tests**:
> - e2e: change `mention app (with pro)` snapshot to
`snapshotServerDump("request")` and update snapshot to assert request
payload contents.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
7ddddf6c16c53cd36b4c7e4ec6a57da0616d1bb0. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

e2e-tests/mention_app.spec.ts

@@ -17,5 +17,5 @@ test("mention app (with pro)", async ({ po }) => {
   await po.goToAppsTab();
   await po.sendPrompt("[dump] @app:minimal-with-ai-rules hi");
 
-  await po.snapshotServerDump("all-messages");
+  await po.snapshotServerDump("request");
 });

src/ipc/handlers/chat_stream_handlers.ts

@@ -630,7 +630,10 @@ This conversation includes one or more image attachments. When the user uploads
               },
             ] as const);
 
-        const otherCodebasePrefix = otherAppsCodebaseInfo
+        // If engine is enabled, we will send the other apps codebase info to the engine
+        // and process it with smart context.
+        const otherCodebasePrefix =
+          otherAppsCodebaseInfo && !isEngineEnabled
             ? ([
                 {
                   role: "user",
@@ -720,6 +723,12 @@ This conversation includes one or more image attachments. When the user uploads
             "dyad-engine": {
               dyadRequestId,
               dyadDisableFiles,
+              dyadMentionedApps: mentionedAppsCodebases.map(
+                ({ files, appName }) => ({
+                  appName,
+                  files,
+                }),
+              ),
             },
             "dyad-gateway": getExtraProviderOptions(
               modelClient.builtinProviderId,

src/ipc/utils/llm_engine_provider.ts

@@ -142,6 +142,10 @@ export function createDyadEngine(
           if ("dyadDisableFiles" in parsedBody) {
             delete parsedBody.dyadDisableFiles;
           }
+          const dyadMentionedApps = parsedBody.dyadMentionedApps;
+          if ("dyadMentionedApps" in parsedBody) {
+            delete parsedBody.dyadMentionedApps;
+          }
 
           // Track and modify requestId with attempt number
           let modifiedRequestId = requestId;
@@ -161,6 +165,9 @@ export function createDyadEngine(
               smart_context_mode: options.dyadOptions.smartContextMode,
               enable_web_search: options.dyadOptions.enableWebSearch,
             };
+            if (dyadMentionedApps?.length) {
+              parsedBody.dyad_options.mentioned_apps = dyadMentionedApps;
+            }
           }
 
           // Return modified request with files included and requestId in headers

src/ipc/utils/mention_apps.ts

@@ -1,6 +1,6 @@
 import { db } from "../../db";
 import { getDyadAppPath } from "../../paths/paths";
-import { extractCodebase } from "../../utils/codebase";
+import { CodebaseFile, extractCodebase } from "../../utils/codebase";
 import { validateChatContext } from "../utils/context_paths_utils";
 import log from "electron-log";
 
@@ -10,7 +10,7 @@ const logger = log.scope("mention_apps");
 export async function extractMentionedAppsCodebases(
   mentionedAppNames: string[],
   excludeCurrentAppId?: number,
-): Promise<{ appName: string; codebaseInfo: string }[]> {
+): Promise<{ appName: string; codebaseInfo: string; files: CodebaseFile[] }[]> {
   if (mentionedAppNames.length === 0) {
     return [];
   }
@@ -25,14 +25,18 @@ export async function extractMentionedAppsCodebases(
       ) && app.id !== excludeCurrentAppId,
   );
 
-  const results: { appName: string; codebaseInfo: string }[] = [];
+  const results: {
+    appName: string;
+    codebaseInfo: string;
+    files: CodebaseFile[];
+  }[] = [];
 
   for (const app of mentionedApps) {
     try {
       const appPath = getDyadAppPath(app.path);
       const chatContext = validateChatContext(app.chatContext);
 
-      const { formattedOutput } = await extractCodebase({
+      const { formattedOutput, files } = await extractCodebase({
         appPath,
         chatContext,
       });
@@ -40,6 +44,7 @@ export async function extractMentionedAppsCodebases(
       results.push({
         appName: app.name,
         codebaseInfo: formattedOutput,
+        files,
       });
 
       logger.log(`Extracted codebase for mentioned app: ${app.name}`);