diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..86d3cc4
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,63 @@
+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: "npm"
+
+      - name: Install root dependencies
+        run: npm ci
+
+      - name: Check formatting
+        run: npm run format:check
+
+      - name: Install common dependencies
+        working-directory: ./common
+        run: npm ci
+
+      - name: Type check common
+        working-directory: ./common
+        run: npx tsc --noEmit
+
+      - name: Build common
+        working-directory: ./common
+        run: npm run build
+
+      - name: Install mcp-server dependencies
+        working-directory: ./mcp-server
+        run: npm ci
+
+      - name: Type check mcp-server
+        working-directory: ./mcp-server
+        run: npx tsc --noEmit
+
+      - name: Build mcp-server
+        working-directory: ./mcp-server
+        run: npm run build
+
+      - name: Install penpot-plugin dependencies
+        working-directory: ./penpot-plugin
+        run: npm ci
+
+      - name: Type check penpot-plugin
+        working-directory: ./penpot-plugin
+        run: npx tsc --noEmit
+
+      - name: Build penpot-plugin
+        working-directory: ./penpot-plugin
+        run: npm run build
diff --git a/package-lock.json b/package-lock.json
index 87c8985..052267c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,9 @@
       "dependencies": {
         "concurrently": "^8.2.2",
         "kill-port": "^2.0.1"
+      },
+      "devDependencies": {
+        "prettier": "^3.0.0"
       }
     },
     "node_modules/@babel/runtime": {
@@ -215,6 +218,22 @@
       "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
       "license": "MIT"
     },
+    "node_modules/prettier": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.6.2.tgz",
+      "integrity": "sha512-I7AIg5boAr5R0FFtJ6rCfD+LFsWHp81dolrFD8S79U9tb8Az2nGrJncnMSnys+bpQJfRUzqs9hnA81OAA3hCuQ==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
     "node_modules/require-directory": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
diff --git a/package.json b/package.json
index 674f532..a092ac2 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,8 @@
     "build:all": "concurrently --names \"COMMON,MCP-SERVER,PLUGIN\" --prefix-colors \"green,cyan,magenta\" --success first \"npm --prefix common install && npm --prefix common run build\" \"npm --prefix mcp-server run build\" \"npm --prefix penpot-plugin run build\"",
     "start:all": "concurrently --names \"MCP-SERVER,PLUGIN-SERVER\" --prefix-colors \"cyan,magenta\" --kill-others-on-fail \"npm --prefix mcp-server start\" \"npm --prefix penpot-plugin run dev\"",
     "bootstrap": "npm run install:all && npm run build:all && npm run start:all",
-    "format": "prettier --write ."
+    "format": "prettier --write .",
+    "format:check": "prettier --check ."
   },
   "repository": {
     "type": "git",