diff --git a/memento-note/lib/ai/tools/excalidraw.tool.ts b/memento-note/lib/ai/tools/excalidraw.tool.ts
index f07e066..0d032e6 100644
--- a/memento-note/lib/ai/tools/excalidraw.tool.ts
+++ b/memento-note/lib/ai/tools/excalidraw.tool.ts
@@ -4,7 +4,16 @@ import { tool } from 'ai'
 import { z } from 'zod'
 import { toolRegistry } from './registry'
 import { prisma } from '@/lib/prisma'
-import dagre from 'dagre'
+// import type is erased at build time — Turbopack won't try to resolve the module
+import type dagreType from 'dagre'
+let _dagre: typeof dagreType | null = null
+async function getDagre(): Promise<typeof dagreType> {
+  if (!_dagre) {
+    const mod = await import('dagre')
+    _dagre = (mod.default ?? mod) as typeof dagreType
+  }
+  return _dagre
+}
 
 interface SimplifiedNode {
   id: string
@@ -504,12 +513,13 @@ function getNodeRenderSpec(node: SimplifiedNode, isCenter: boolean): NodeRenderS
   return { text: wrapped, fontSize, width, height }
 }
 
-function computeNodeLayoutForRankdir(
+async function computeNodeLayoutForRankdir(
   nodes: SimplifiedNode[],
   edges: SimplifiedEdge[],
   rankdir: 'LR' | 'TB',
   renderSpecs: Map<string, NodeRenderSpec>,
-): Map<string, NodeLayoutBox> {
+): Promise<Map<string, NodeLayoutBox>> {
+  const dagre = await getDagre()
   const graph = new dagre.graphlib.Graph()
   graph.setGraph({
     rankdir,
@@ -738,11 +748,11 @@ async function computeNodeLayout(
   const firstRankdir: 'LR' | 'TB' = (diagramType === 'org-chart') ? 'TB' : 'LR'
   const secondRankdir: 'LR' | 'TB' = firstRankdir === 'LR' ? 'TB' : 'LR'
 
-  const lrLayout = computeNodeLayoutForRankdir(nodes, edges, firstRankdir, renderSpecs)
+  const lrLayout = await computeNodeLayoutForRankdir(nodes, edges, firstRankdir, renderSpecs)
   const lrQuality = computeLayoutQuality(nodes, edges, lrLayout)
   const lrBounds = getLayoutBounds(lrLayout)
 
-  const tbLayout = computeNodeLayoutForRankdir(nodes, edges, secondRankdir, renderSpecs)
+  const tbLayout = await computeNodeLayoutForRankdir(nodes, edges, secondRankdir, renderSpecs)
   const tbQuality = computeLayoutQuality(nodes, edges, tbLayout)
   const tbBounds = getLayoutBounds(tbLayout)
 
diff --git a/memento-note/lib/ai/tools/pptx.tool.ts b/memento-note/lib/ai/tools/pptx.tool.ts
index 32309e1..c584dbe 100644
--- a/memento-note/lib/ai/tools/pptx.tool.ts
+++ b/memento-note/lib/ai/tools/pptx.tool.ts
@@ -1,6 +1,16 @@
 'use server'
 
-import PptxGenJS from 'pptxgenjs'
+// import type is erased at build time — Turbopack won't try to resolve the module
+import type PptxGenJSModule from 'pptxgenjs'
+// Lazy singleton — actual module loaded at runtime only
+let _PptxGenJS: (new () => PptxGenJSModule) | null = null
+async function getPptxGenClass(): Promise<new () => PptxGenJSModule> {
+  if (!_PptxGenJS) {
+    const mod = await import('pptxgenjs')
+    _PptxGenJS = (mod.default ?? mod) as unknown as new () => PptxGenJSModule
+  }
+  return _PptxGenJS
+}
 import { tool } from 'ai'
 import { z } from 'zod'
 import { toolRegistry } from './registry'
@@ -960,10 +970,11 @@ function addClosingSlide(pres: PptxGenJS, spec: PresentationSpec, t: Theme, styl
   return s
 }
 
-function buildPresentation(spec: PresentationSpec): PptxGenJS {
+async function buildPresentation(spec: PresentationSpec): Promise<PptxGenJSModule> {
   const { theme } = resolveTheme(spec)
   const style = STYLES[spec.style || 'soft'] || STYLES.soft!
 
+  const PptxGenJS = await getPptxGenClass()
   const pres = new PptxGenJS()
   pres.title = spec.title
   pres.author = 'Momento'
@@ -1131,7 +1142,7 @@ RULES:
             }
           }
 
-          const pptx = buildPresentation(spec)
+          const pptx = await buildPresentation(spec)
           const base64 = await pptx.write({ outputType: 'base64' }) as string
 
           const canvas = await prisma.canvas.create({