feat(FN-3049): stabilize engine imports and add agent onboarding modal

Merges FN-3049 to replace all runtime dynamic imports of `@fusion/engine` with static imports that esbuild can inline into the CLI bundle, preventing the known regression where the published `npm i -g @runfusion/fusion` silently failed at the import site. Also ships FN-3024, adding an experimental a

Fusion-Task-Id: FN-3049

.changeset/fn-3049-engine-static-imports.md

@@ -0,0 +1,5 @@
+---
+"@runfusion/fusion": patch
+---
+
+Replace dashboard runtime dynamic `@fusion/engine` imports with bundler-safe static imports and add regression coverage to prevent reintroduction. This avoids npm-installed runtime failures caused by non-static engine imports that cannot be safely inlined during bundling.

packages/dashboard/src/__tests__/engine-import-regression.test.ts

@@ -0,0 +1,55 @@
+import { describe, expect, it } from "vitest";
+import { readdirSync, readFileSync, statSync } from "node:fs";
+import { dirname, join, relative } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const DYNAMIC_ENGINE_IMPORT_PATTERN = /await\s+import\((\/\*.*?\*\/\s*)?"@fusion\/engine"\)/g;
+
+function collectTsFiles(dir: string): string[] {
+  const entries = readdirSync(dir);
+  const files: string[] = [];
+
+  for (const entry of entries) {
+    const fullPath = join(dir, entry);
+    const stat = statSync(fullPath);
+
+    if (stat.isDirectory()) {
+      if (entry === "__tests__") {
+        continue;
+      }
+      files.push(...collectTsFiles(fullPath));
+      continue;
+    }
+
+    if (!fullPath.endsWith(".ts") && !fullPath.endsWith(".tsx")) {
+      continue;
+    }
+    if (/\.test\.tsx?$/.test(fullPath)) {
+      continue;
+    }
+
+    files.push(fullPath);
+  }
+
+  return files;
+}
+
+describe("FN-3049 regression: runtime engine imports stay bundler-safe", () => {
+  it("blocks dynamic await import('@fusion/engine') in dashboard/cli runtime source", () => {
+    const testDir = dirname(fileURLToPath(import.meta.url));
+    const dashboardSrcDir = join(testDir, "..");
+    const cliSrcDir = join(testDir, "..", "..", "..", "cli", "src");
+    const filesToAudit = [...collectTsFiles(dashboardSrcDir), ...collectTsFiles(cliSrcDir)];
+
+    const offenders: string[] = [];
+    for (const filePath of filesToAudit) {
+      const content = readFileSync(filePath, "utf8");
+      if (DYNAMIC_ENGINE_IMPORT_PATTERN.test(content)) {
+        offenders.push(relative(dashboardSrcDir, filePath));
+      }
+      DYNAMIC_ENGINE_IMPORT_PATTERN.lastIndex = 0;
+    }
+
+    expect(offenders).toEqual([]);
+  });
+});

packages/dashboard/src/__tests__/routes.test.ts

@@ -35,6 +35,7 @@ import { get as performGet, request as performRequest } from "../test-request.js
 import { resetRuntimeLogSink, setRuntimeLogSink } from "../runtime-logger.js";
 import { resetDiagnosticsSink, setDiagnosticsSink, type LogEntry } from "../ai-session-diagnostics.js";
 import * as updateCheckModule from "../update-check.js";
+import { __setAgentReflectionServiceForTests } from "../routes/register-agent-reflection-rating-routes.js";
 
 // Mock @fusion/core for gh CLI auth checks
 const mockCentralListProjects = vi.fn().mockResolvedValue([]);
@@ -18730,6 +18731,15 @@ describe("Agent Reflection routes", () => {
     return app;
   }
 
+  afterEach(async () => {
+    const engine = await import("@fusion/engine");
+    const reflectionService =
+      "AgentReflectionService" in engine && typeof engine.AgentReflectionService === "function"
+        ? (engine.AgentReflectionService as unknown as Parameters<typeof __setAgentReflectionServiceForTests>[0])
+        : undefined;
+    __setAgentReflectionServiceForTests(reflectionService);
+  });
+
   describe("GET /api/agents/:id/reflections", () => {
     it("returns 200 for valid agent (uses real stores)", async () => {
       const res = await GET(buildApp(), `/api/agents/${agentId}/reflections`);
@@ -18780,6 +18790,7 @@ describe("Agent Reflection routes", () => {
 
     it("returns 500 with a clear message when reflection generation returns null", async () => {
       const engine = await import("@fusion/engine");
+      __setAgentReflectionServiceForTests(engine.AgentReflectionService);
       const generateReflectionSpy = vi
         .spyOn(engine.AgentReflectionService.prototype, "generateReflection")
         .mockResolvedValueOnce(null);
@@ -18826,6 +18837,13 @@ describe("Agent Reflection routes", () => {
   });
 
   describe("GET /api/agents/:id/reflection-context", () => {
+    it("returns 503 when reflection service binding is unavailable", async () => {
+      __setAgentReflectionServiceForTests(undefined);
+      const res = await GET(buildApp(), `/api/agents/${agentId}/reflection-context`);
+
+      expect(res.status).toBe(503);
+      expect(res.body.error).toContain("Reflection service not available");
+    });
     it("returns 200 when reflection context is available, otherwise 500/503", async () => {
       const res = await GET(buildApp(), `/api/agents/${agentId}/reflection-context`);
 

packages/dashboard/src/chat.ts

@@ -27,6 +27,7 @@ import { join, resolve, relative } from "node:path";
 import { SessionEventBuffer } from "./sse-buffer.js";
 
 import { createFnAgent as engineCreateFnAgent } from "@fusion/engine";
+import * as engineModule from "@fusion/engine";
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 type AgentResult = any;
@@ -100,13 +101,8 @@ async function ensureEngineReady(): Promise<void> {
     return;
   }
 
-  try {
+  if ("buildAgentChatPrompt" in engineModule && typeof engineModule.buildAgentChatPrompt === "function") {
-    const engine = await import("@fusion/engine");
+    buildAgentChatPromptFn = engineModule.buildAgentChatPrompt;
-    if ("buildAgentChatPrompt" in engine && typeof engine.buildAgentChatPrompt === "function") {
-      buildAgentChatPromptFn = engine.buildAgentChatPrompt;
-    }
-  } catch {
-    // Optional helper unavailable in mocked/test contexts.
   }
 }
 

packages/dashboard/src/insights-routes.ts

@@ -28,6 +28,7 @@ import {
   badRequest,
   notFound,
 } from "./api-error.js";
+import { createFnAgent, promptWithFallback } from "@fusion/engine";
 
 /**
  * Re-throws an error as an ApiError, converting unknown errors to internal errors.
@@ -251,8 +252,6 @@ export function createInsightsRouter(store: TaskStore): Router {
       const existingInsights = await readInsightsMemory(rootDir);
 
       try {
-        const { createFnAgent, promptWithFallback } = await import("@fusion/engine");
-
         let responseText = "";
         const { session } = await createFnAgent({
           cwd: rootDir,

packages/dashboard/src/planning.ts

@@ -31,6 +31,7 @@ import {
   nonfatal,
 } from "./ai-session-diagnostics.js";
 import { createFnAgent as engineCreateFnAgent } from "@fusion/engine";
+import * as engineModule from "@fusion/engine";
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 type AgentResult = any;
@@ -133,28 +134,25 @@ async function ensureNtfyHelpersReady(): Promise<void> {
     return;
   }
 
-  try {
+  const hasNotificationService = "NotificationService" in engineModule
-    const engine = await import("@fusion/engine");
+    && typeof engineModule.NotificationService === "function";
-
-    const hasNotificationService = "NotificationService" in engine
-      && typeof engine.NotificationService === "function";
 
   const hasAllHelpers =
-      "isNtfyEventEnabled" in engine
+    "isNtfyEventEnabled" in engineModule
-      && "buildNtfyClickUrl" in engine
+    && "buildNtfyClickUrl" in engineModule
-      && "sendNtfyNotification" in engine
+    && "sendNtfyNotification" in engineModule
-      && typeof engine.isNtfyEventEnabled === "function"
+    && typeof engineModule.isNtfyEventEnabled === "function"
-      && typeof engine.buildNtfyClickUrl === "function"
+    && typeof engineModule.buildNtfyClickUrl === "function"
-      && typeof engine.sendNtfyNotification === "function";
+    && typeof engineModule.sendNtfyNotification === "function";
 
   if (!hasAllHelpers) {
     return;
   }
 
   planningNtfyHelpers = {
-      isNtfyEventEnabled: engine.isNtfyEventEnabled,
+    isNtfyEventEnabled: engineModule.isNtfyEventEnabled,
-      buildNtfyClickUrl: engine.buildNtfyClickUrl,
+    buildNtfyClickUrl: engineModule.buildNtfyClickUrl,
-      sendNtfyNotification: engine.sendNtfyNotification,
+    sendNtfyNotification: engineModule.sendNtfyNotification,
   };
 
   if (hasNotificationService) {
@@ -163,9 +161,6 @@ async function ensureNtfyHelpersReady(): Promise<void> {
       { operation: "notification-service-detection" },
     );
   }
-  } catch {
-    // Optional notifier helpers unavailable in this runtime/test context.
-  }
 }
 
 // ── Constants ───────────────────────────────────────────────────────────────

packages/dashboard/src/routes.ts

@@ -275,7 +275,7 @@ async function discoverDashboardPiExtensions(cwd: string): Promise<PiExtensionSe
   };
 }
 
-import { createFnAgent as engineCreateFnAgentForRefine } from "@fusion/engine";
+import { createFnAgent as engineCreateFnAgentForRefine, promptWithFallback as enginePromptWithFallback } from "@fusion/engine";
 
 // Test-injectable override; defaults to the statically imported engine binding.
 let createFnAgentForRefine: typeof import("@fusion/engine").createFnAgent | undefined = engineCreateFnAgentForRefine;
@@ -4121,7 +4121,21 @@ async function executeAiPromptStep(
     };
   }
 
-  const { createFnAgent, promptWithFallback } = await import("@fusion/engine");
+  const createFnAgent = createFnAgentForRefine;
+  const promptWithFallback = enginePromptWithFallback;
+  if (!createFnAgent) {
+    return {
+      stepId: step.id,
+      stepName: step.name,
+      stepIndex: 0,
+      success: false,
+      output: "",
+      error: "AI agent not available",
+      startedAt,
+      completedAt: new Date().toISOString(),
+    };
+  }
+
   const settings = await taskStore.getSettings();
   const defaultModel = resolveProjectDefaultModel(settings);
   const modelProvider = step.modelProvider?.trim() || defaultModel.provider;

packages/dashboard/src/routes/register-agent-core-routes.ts

@@ -3,6 +3,7 @@ import type { Agent, AgentCapability, AgentUpdateInput, TaskStore } from "@fusio
 import { getDefaultHeartbeatProcedurePath } from "@fusion/core";
 import { ApiError, badRequest, notFound } from "../api-error.js";
 import type { ApiRoutesContext } from "./types.js";
+import { ensureDefaultHeartbeatProcedureFile, HEARTBEAT_PROCEDURE } from "@fusion/engine";
 
 interface AgentCoreRouteDeps {
   sanitizeAgentTaskLinks: (agents: Agent[], scopedStore: TaskStore) => Promise<Agent[]>;
@@ -162,7 +163,6 @@ export function registerAgentCoreListCreateRoutes(ctx: ApiRoutesContext, deps: A
       const expectedDefaultPath = getDefaultHeartbeatProcedurePath(agent.id);
       if (agent.heartbeatProcedurePath === expectedDefaultPath) {
         try {
-          const { ensureDefaultHeartbeatProcedureFile, HEARTBEAT_PROCEDURE } = await import("@fusion/engine");
           await ensureDefaultHeartbeatProcedureFile(scopedStore.getRootDir(), expectedDefaultPath, HEARTBEAT_PROCEDURE);
         } catch {
           // Non-fatal — the heartbeat resolver falls back to the in-memory constant.
@@ -491,7 +491,6 @@ export function registerAgentCoreRoutes(ctx: ApiRoutesContext, deps: AgentCoreRo
       }
 
       const targetPath = getDefaultHeartbeatProcedurePath(req.params.id);
-      const { ensureDefaultHeartbeatProcedureFile, HEARTBEAT_PROCEDURE } = await import("@fusion/engine");
       const filePath = await ensureDefaultHeartbeatProcedureFile(
         scopedStore.getRootDir(),
         targetPath,

packages/dashboard/src/routes/register-agent-reflection-rating-routes.ts

@@ -1,5 +1,22 @@
 import { ApiError, badRequest, internalError, notFound } from "../api-error.js";
 import type { ApiRoutesContext } from "./types.js";
+import * as engineModule from "@fusion/engine";
+
+type EngineAgentReflectionService = typeof engineModule extends {
+  AgentReflectionService: infer T;
+}
+  ? T
+  : never;
+
+let AgentReflectionServiceBinding: EngineAgentReflectionService | undefined =
+  "AgentReflectionService" in engineModule && typeof engineModule.AgentReflectionService === "function"
+    ? (engineModule.AgentReflectionService as EngineAgentReflectionService)
+    : undefined;
+
+/** @internal test hook for reflection-service-unavailable branches. */
+export function __setAgentReflectionServiceForTests(service: EngineAgentReflectionService | undefined): void {
+  AgentReflectionServiceBinding = service;
+}
 
 export function registerAgentReflectionRatingRoutes(ctx: ApiRoutesContext): void {
   const { router, getProjectContext, rethrowAsApiError } = ctx;
@@ -98,7 +115,6 @@ export function registerAgentReflectionRatingRoutes(ctx: ApiRoutesContext): void
     try {
       const { store: taskStore } = await getProjectContext(req);
       const { AgentStore, ReflectionStore } = await import("@fusion/core");
-      const { AgentReflectionService } = await import("@fusion/engine");
       const agentStore = new AgentStore({ rootDir: taskStore.getFusionDir() });
       const reflectionStore = new ReflectionStore({ rootDir: taskStore.getFusionDir() });
       await agentStore.init();
@@ -115,6 +131,12 @@ export function registerAgentReflectionRatingRoutes(ctx: ApiRoutesContext): void
         throw notFound("Agent not found");
       }
 
+      const AgentReflectionService = AgentReflectionServiceBinding;
+      if (!AgentReflectionService) {
+        res.status(503).json({ error: "Reflection service not available" });
+        return;
+      }
+
       // Create the reflection service and generate a reflection
       const reflectionService = new AgentReflectionService({
         agentStore,
@@ -205,16 +227,7 @@ export function registerAgentReflectionRatingRoutes(ctx: ApiRoutesContext): void
         throw notFound("Agent not found");
       }
 
-      // Check if AgentReflectionService is available
+      const AgentReflectionService = AgentReflectionServiceBinding;
-      let AgentReflectionService: typeof import("@fusion/engine").AgentReflectionService | undefined;
-      try {
-        const engine = await import("@fusion/engine");
-        AgentReflectionService = engine.AgentReflectionService;
-      } catch {
-        res.status(503).json({ error: "Reflection service not available" });
-        return;
-      }
-
       if (!AgentReflectionService) {
         res.status(503).json({ error: "Reflection service not available" });
         return;