diff --git a/packages/sdk/package.json b/packages/sdk/package.json
new file mode 100644
index 0000000..f66f70c
--- /dev/null
+++ b/packages/sdk/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "@tower/sdk",
+  "version": "0.0.1",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "default": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsc --watch"
+  },
+  "devDependencies": {
+    "typescript": "^5.7.0"
+  }
+}
diff --git a/packages/sdk/src/index.ts b/packages/sdk/src/index.ts
new file mode 100644
index 0000000..7fac604
--- /dev/null
+++ b/packages/sdk/src/index.ts
@@ -0,0 +1,2 @@
+// External SDK — populated in later plans
+export {};
diff --git a/packages/sdk/tsconfig.json b/packages/sdk/tsconfig.json
new file mode 100644
index 0000000..792172f
--- /dev/null
+++ b/packages/sdk/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": ["src"]
+}
diff --git a/packages/ui/package.json b/packages/ui/package.json
new file mode 100644
index 0000000..6c886c1
--- /dev/null
+++ b/packages/ui/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "@tower/ui",
+  "version": "0.0.1",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "scripts": {
+    "build": "echo 'ui is consumed as source by Next.js'"
+  },
+  "peerDependencies": {
+    "react": "^19.0.0"
+  },
+  "devDependencies": {
+    "@types/react": "^19.0.0",
+    "react": "^19.0.0",
+    "typescript": "^5.7.0"
+  }
+}
diff --git a/packages/ui/src/index.ts b/packages/ui/src/index.ts
new file mode 100644
index 0000000..31b1bfc
--- /dev/null
+++ b/packages/ui/src/index.ts
@@ -0,0 +1,2 @@
+// UI component library — populated in later plans
+export {};
diff --git a/packages/ui/tsconfig.json b/packages/ui/tsconfig.json
new file mode 100644
index 0000000..b7c871a
--- /dev/null
+++ b/packages/ui/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "jsx": "react-jsx",
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": ["src"]
+}