diff --git a/packages/cli/package.json b/packages/cli/package.json
index 5e4de30525..22980aa3f5 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -9,7 +9,7 @@
     "os": "./bin/run.js"
   },
   "scripts": {
-    "build": "tsc -p tsconfig.build.json",
+    "build": "if [ -n \"$OS_SKIP_DTS\" ]; then tsc -p tsconfig.build.json --noCheck --declaration false --declarationMap false; else tsc -p tsconfig.build.json; fi",
     "dev": "tsc -p tsconfig.build.json --watch",
     "test": "vitest run",
     "lint": "eslint src"
diff --git a/packages/cli/src/commands/serve.ts b/packages/cli/src/commands/serve.ts
index e5f98a011c..7a75c97d8b 100644
--- a/packages/cli/src/commands/serve.ts
+++ b/packages/cli/src/commands/serve.ts
@@ -1377,7 +1377,11 @@ export default class Serve extends Command {
           trackPlugin('AIService');
         } catch (err: unknown) {
           const msg = err instanceof Error ? err.message : String(err);
-          if (!msg.includes('Cannot find module') && !msg.includes('ERR_MODULE_NOT_FOUND')) {
+          const code = (err as { code?: string })?.code;
+          const missing = code === 'ERR_MODULE_NOT_FOUND'
+            || msg.includes('Cannot find module')
+            || msg.includes('Cannot find package');
+          if (!missing) {
             console.error('[AI] AIServicePlugin failed to start:', msg);
           }
           // @objectstack/service-ai not installed — AI features unavailable
@@ -1401,7 +1405,11 @@ export default class Serve extends Command {
             trackPlugin('AIStudio');
           } catch (err: unknown) {
             const msg = err instanceof Error ? err.message : String(err);
-            if (!msg.includes('Cannot find module') && !msg.includes('ERR_MODULE_NOT_FOUND')) {
+            const code = (err as { code?: string })?.code;
+            const missing = code === 'ERR_MODULE_NOT_FOUND'
+              || msg.includes('Cannot find module')
+              || msg.includes('Cannot find package');
+            if (!missing) {
               console.error('[AI Studio] AIStudioPlugin failed to start:', msg);
             }
             // @objectstack/service-ai-studio not installed — AI authoring unavailable
diff --git a/packages/cli/tsup.config.ts b/packages/cli/tsup.config.ts
index e3c4898f83..a26047d4ff 100644
--- a/packages/cli/tsup.config.ts
+++ b/packages/cli/tsup.config.ts
@@ -17,7 +17,7 @@ export default defineConfig([
   {
     entry: ['src/index.ts'],
     format: ['esm'],
-    dts: true,
+    dts: !process.env.OS_SKIP_DTS,
     shims: true,
   },
 ]);
diff --git a/packages/core/tsup.config.ts b/packages/core/tsup.config.ts
index ba2a9673c4..365b76b31f 100644
--- a/packages/core/tsup.config.ts
+++ b/packages/core/tsup.config.ts
@@ -13,7 +13,7 @@ export default defineConfig({
   splitting: false,
   sourcemap: true,
   clean: true,
-  dts: true,
+  dts: !process.env.OS_SKIP_DTS,
   format: ['esm', 'cjs'],
   target: 'es2020',
 });
diff --git a/packages/metadata-core/tsup.config.ts b/packages/metadata-core/tsup.config.ts
index be6392f3de..a9fe160868 100644
--- a/packages/metadata-core/tsup.config.ts
+++ b/packages/metadata-core/tsup.config.ts
@@ -7,7 +7,7 @@ export default defineConfig({
   splitting: true,
   sourcemap: true,
   clean: true,
-  dts: true,
+  dts: !process.env.OS_SKIP_DTS,
   format: ['esm', 'cjs'],
   target: 'es2020',
   external: ['vitest'],
diff --git a/packages/metadata-fs/tsup.config.ts b/packages/metadata-fs/tsup.config.ts
index 5a1f5ef5a9..88826a7e6b 100644
--- a/packages/metadata-fs/tsup.config.ts
+++ b/packages/metadata-fs/tsup.config.ts
@@ -7,7 +7,7 @@ export default defineConfig({
   splitting: false,
   sourcemap: true,
   clean: true,
-  dts: true,
+  dts: !process.env.OS_SKIP_DTS,
   format: ['esm', 'cjs'],
   target: 'es2020',
   external: ['chokidar', '@objectstack/metadata-core'],
diff --git a/packages/metadata/tsup.config.ts b/packages/metadata/tsup.config.ts
index 665d2b419e..a6d6f382fb 100644
--- a/packages/metadata/tsup.config.ts
+++ b/packages/metadata/tsup.config.ts
@@ -11,7 +11,7 @@ export default defineConfig({
   splitting: false,
   sourcemap: true,
   clean: true,
-  dts: true,
+  dts: !process.env.OS_SKIP_DTS,
   format: ['esm', 'cjs'],
   target: 'es2020',
 });
diff --git a/packages/platform-objects/tsup.config.ts b/packages/platform-objects/tsup.config.ts
index 8dc68c40c6..f147ec30fd 100644
--- a/packages/platform-objects/tsup.config.ts
+++ b/packages/platform-objects/tsup.config.ts
@@ -17,7 +17,7 @@ export default defineConfig({
     plugin: 'src/plugin.ts',
   },
   format: ['cjs', 'esm'],
-  dts: true,
+  dts: !process.env.OS_SKIP_DTS,
   clean: true,
   sourcemap: true,
   splitting: false,
diff --git a/packages/plugins/plugin-webhooks/tsup.config.ts b/packages/plugins/plugin-webhooks/tsup.config.ts
index 983062dbef..37429d0932 100644
--- a/packages/plugins/plugin-webhooks/tsup.config.ts
+++ b/packages/plugins/plugin-webhooks/tsup.config.ts
@@ -7,7 +7,7 @@ export default defineConfig({
     splitting: true,
     sourcemap: true,
     clean: true,
-    dts: true,
+    dts: !process.env.OS_SKIP_DTS,
     format: ['esm', 'cjs'],
     target: 'es2020',
     external: ['vitest'],
diff --git a/packages/runtime/tsup.config.ts b/packages/runtime/tsup.config.ts
index 3b7de514f4..0e3f256726 100644
--- a/packages/runtime/tsup.config.ts
+++ b/packages/runtime/tsup.config.ts
@@ -7,7 +7,7 @@ export default defineConfig({
   splitting: false,
   sourcemap: true,
   clean: true,
-  dts: true,
+  dts: !process.env.OS_SKIP_DTS,
   format: ['esm', 'cjs'],
   target: 'es2020',
   // Mark driver packages as external so they are resolved at runtime, not bundled
diff --git a/packages/services/service-cluster-redis/tsup.config.ts b/packages/services/service-cluster-redis/tsup.config.ts
index e99e286398..c1773045fb 100644
--- a/packages/services/service-cluster-redis/tsup.config.ts
+++ b/packages/services/service-cluster-redis/tsup.config.ts
@@ -7,7 +7,7 @@ export default defineConfig({
     splitting: true,
     sourcemap: true,
     clean: true,
-    dts: true,
+    dts: !process.env.OS_SKIP_DTS,
     format: ['esm', 'cjs'],
     target: 'es2020',
     external: ['vitest', 'ioredis'],
diff --git a/packages/services/service-cluster/tsup.config.ts b/packages/services/service-cluster/tsup.config.ts
index 53dfb458c5..31546183ca 100644
--- a/packages/services/service-cluster/tsup.config.ts
+++ b/packages/services/service-cluster/tsup.config.ts
@@ -7,7 +7,7 @@ export default defineConfig({
   splitting: true,
   sourcemap: true,
   clean: true,
-  dts: true,
+  dts: !process.env.OS_SKIP_DTS,
   format: ['esm', 'cjs'],
   target: 'es2020',
   external: ['vitest'],
diff --git a/packages/services/service-datasource/tsup.config.ts b/packages/services/service-datasource/tsup.config.ts
index 6659899115..d54f0e0b9a 100644
--- a/packages/services/service-datasource/tsup.config.ts
+++ b/packages/services/service-datasource/tsup.config.ts
@@ -7,7 +7,7 @@ export default defineConfig({
     splitting: true,
     sourcemap: true,
     clean: true,
-    dts: true,
+    dts: !process.env.OS_SKIP_DTS,
     format: ['esm', 'cjs'],
     target: 'es2020',
     // Driver packages are loaded via optional, lazy `await import('@objectstack/driver-*')`
diff --git a/packages/spec/package.json b/packages/spec/package.json
index 9dedfdc30d..4d72f2a444 100644
--- a/packages/spec/package.json
+++ b/packages/spec/package.json
@@ -178,7 +178,7 @@
     "src/**/*.zod.ts"
   ],
   "scripts": {
-    "build": "pnpm gen:schema && pnpm gen:openapi && tsup && NODE_OPTIONS=\"--max-old-space-size=4096\" BUILD_DTS=true tsup",
+    "build": "pnpm gen:schema && pnpm gen:openapi && tsup && if [ -z \"$OS_SKIP_DTS\" ]; then NODE_OPTIONS=\"--max-old-space-size=4096\" BUILD_DTS=true tsup; fi",
     "dev": "tsc --watch",
     "clean": "rm -rf dist",
     "gen:schema": "OS_EAGER_SCHEMAS=1 tsx scripts/build-schemas.ts",
diff --git a/tsup.config.ts b/tsup.config.ts
index 533062fa6e..ffa32ebd48 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -5,7 +5,7 @@ export default defineConfig({
   splitting: false,
   sourcemap: true,
   clean: true,
-  dts: true,
+  dts: !process.env.OS_SKIP_DTS,
   format: ['esm', 'cjs'],
   target: 'es2020',
 });
diff --git a/turbo.json b/turbo.json
index 624a57bcfc..6b670ca659 100644
--- a/turbo.json
+++ b/turbo.json
@@ -1,6 +1,7 @@
 {
   "$schema": "https://turbo.build/schema.json",
   "globalDependencies": ["tsconfig.json", "tsup.config.ts"],
+  "globalEnv": ["OS_SKIP_DTS"],
   "tasks": {
     "build": {
       "dependsOn": ["^build"],