diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
new file mode 100644
index 0000000..cbeae54
--- /dev/null
+++ b/.github/workflows/pr.yml
@@ -0,0 +1,43 @@
+name: PR Checks
+
+on:
+  pull_request:
+    branches: [ main ]
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20.x]
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Lint
+      run: npm run lint
+
+    - name: Build Packages
+      run: npm run build:packages
+
+    - name: Typecheck
+      run: npm run typecheck
+
+    - name: Build
+      run: npm run build
+
diff --git a/apps/server/src/logger.ts b/apps/server/src/logger.ts
index 4ab601c..9427efd 100644
--- a/apps/server/src/logger.ts
+++ b/apps/server/src/logger.ts
@@ -1,4 +1,4 @@
-/* eslint-disable no-console */
+ 
 export const logger = {
   info: (...args: unknown[]) => console.log('[INFO]', ...args),
   warn: (...args: unknown[]) => console.warn('[WARN]', ...args),
diff --git a/apps/server/src/routes/workflows.ts b/apps/server/src/routes/workflows.ts
index ba1cec8..fa081e6 100644
--- a/apps/server/src/routes/workflows.ts
+++ b/apps/server/src/routes/workflows.ts
@@ -1,7 +1,8 @@
 import type { Request, Response, Router } from 'express';
 import { Router as createRouter } from 'express';
-import { WorkflowGraph, WorkflowRunRecord, WorkflowRunResult } from '@agentic/types';
-import WorkflowEngine, { WorkflowLLM } from '@agentic/workflow-engine';
+import type { WorkflowGraph, WorkflowRunRecord, WorkflowRunResult } from '@agentic/types';
+import type { WorkflowLLM } from '@agentic/workflow-engine';
+import WorkflowEngine from '@agentic/workflow-engine';
 import { addWorkflow, getWorkflow, removeWorkflow } from '../store/active-workflows';
 import { saveRunRecord } from '../services/persistence';
 import { config } from '../config';
diff --git a/apps/server/src/services/openai-llm.ts b/apps/server/src/services/openai-llm.ts
index 13f1c78..bba7af8 100644
--- a/apps/server/src/services/openai-llm.ts
+++ b/apps/server/src/services/openai-llm.ts
@@ -1,5 +1,5 @@
-import OpenAI from 'openai';
-import { AgentInvocation, WorkflowLLM } from '@agentic/workflow-engine';
+import type OpenAI from 'openai';
+import type { AgentInvocation, WorkflowLLM } from '@agentic/workflow-engine';
 
 function formatInput(invocation: AgentInvocation) {
   return [
diff --git a/apps/server/src/services/persistence.ts b/apps/server/src/services/persistence.ts
index 7aeb3fa..a466f4b 100644
--- a/apps/server/src/services/persistence.ts
+++ b/apps/server/src/services/persistence.ts
@@ -1,6 +1,6 @@
 import fs from 'node:fs/promises';
 import path from 'node:path';
-import { WorkflowRunRecord } from '@agentic/types';
+import type { WorkflowRunRecord } from '@agentic/types';
 
 export async function saveRunRecord(runsDir: string, record: WorkflowRunRecord): Promise<void> {
   const filePath = path.join(runsDir, `run_${record.runId}.json`);
diff --git a/apps/server/src/store/active-workflows.ts b/apps/server/src/store/active-workflows.ts
index ec592cb..c03638f 100644
--- a/apps/server/src/store/active-workflows.ts
+++ b/apps/server/src/store/active-workflows.ts
@@ -1,4 +1,4 @@
-import WorkflowEngine from '@agentic/workflow-engine';
+import type WorkflowEngine from '@agentic/workflow-engine';
 
 const workflows = new Map<string, WorkflowEngine>();
 
diff --git a/eslint.config.js b/eslint.config.mjs
similarity index 97%
rename from eslint.config.js
rename to eslint.config.mjs
index 68f800f..5a9ce2c 100644
--- a/eslint.config.js
+++ b/eslint.config.mjs
@@ -3,13 +3,15 @@ import tsParser from '@typescript-eslint/parser';
 
 export default [
   {
-    files: ['**/*.ts', '**/*.tsx'],
     ignores: [
       '**/node_modules/**',
       '**/dist/**',
       'data/runs/**',
       'apps/web/public/**'
-    ],
+    ]
+  },
+  {
+    files: ['**/*.ts', '**/*.tsx'],
     languageOptions: {
       parser: tsParser,
       parserOptions: {
@@ -30,4 +32,3 @@ export default [
     }
   }
 ];
-
diff --git a/package.json b/package.json
index 2abb7a6..df3d11d 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "test:engine": "npm --workspace packages/workflow-engine run test",
     "test:server": "npm --workspace apps/server run test",
     "clean": "npm run clean --workspaces",
-    "lint": "eslint . --ext .ts,.tsx",
+    "lint": "eslint .",
     "typecheck": "npm run typecheck:server && npm run typecheck:web",
     "typecheck:server": "npm --workspace apps/server run typecheck",
     "typecheck:web": "npm --workspace apps/web run typecheck"
diff --git a/packages/workflow-engine/src/index.ts b/packages/workflow-engine/src/index.ts
index 4801bc2..b8ea0e1 100644
--- a/packages/workflow-engine/src/index.ts
+++ b/packages/workflow-engine/src/index.ts
@@ -1,4 +1,4 @@
-import {
+import type {
   ApprovalInput,
   WorkflowConnection,
   WorkflowGraph,