diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 000000000..825afde3a
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,45 @@
+name: CI
+
+on:
+  pull_request:
+    branches:
+      - develop
+  push:
+    branches:
+      - develop
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build-and-test:
+    name: Build and test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci --legacy-peer-deps
+
+      - name: Run server tests
+        run: npm test
+
+      - name: Build maxun-core
+        run: npm ci --prefix maxun-core && npm run build --prefix maxun-core
+
+      - name: Build frontend
+        run: npm run build
diff --git a/package.json b/package.json
index 76f1abfe8..8670750ae 100644
--- a/package.json
+++ b/package.json
@@ -98,6 +98,8 @@
     "build": "vite build",
     "build:server": "tsc -p server/tsconfig.json",
     "preview": "vite preview",
+    "test": "npm run test:server",
+    "test:server": "npm run build:server && node --test \"tests/server/**/*.test.js\"",
     "lint": "./node_modules/.bin/eslint .",
     "migrate": "sequelize-cli db:migrate",
     "migrate:undo": "sequelize-cli db:migrate:undo",
diff --git a/tests/server/utils/output-validation.test.js b/tests/server/utils/output-validation.test.js
new file mode 100644
index 000000000..acfa88a06
--- /dev/null
+++ b/tests/server/utils/output-validation.test.js
@@ -0,0 +1,102 @@
+const assert = require('node:assert/strict');
+const { describe, it } = require('node:test');
+
+const {
+  getInterpretationFailureReason,
+  hasExpectedRobotOutput,
+} = require('../../../server/dist/server/src/utils/output-validation');
+
+describe('getInterpretationFailureReason', () => {
+  it('returns the first search or crawl error from interpretation logs', () => {
+    const reason = getInterpretationFailureReason(
+      [
+        'Starting search',
+        '  Search execution error: DuckDuckGo returned no result container  ',
+        'Search action failed: fallback detail',
+      ],
+      'Run completed without output'
+    );
+
+    assert.equal(reason, 'Search execution error: DuckDuckGo returned no result container');
+  });
+
+  it('returns the fallback when logs are missing or do not contain a known marker', () => {
+    assert.equal(
+      getInterpretationFailureReason('not-an-array', 'Run completed without output'),
+      'Run completed without output'
+    );
+
+    assert.equal(
+      getInterpretationFailureReason(['Run started', 'Run ended'], 'Run completed without output'),
+      'Run completed without output'
+    );
+  });
+});
+
+describe('hasExpectedRobotOutput', () => {
+  it('accepts default search output when search results exist', () => {
+    assert.equal(
+      hasExpectedRobotOutput('search', {
+        search: {
+          'Search Results': {
+            results: [{ title: 'Maxun', url: 'https://www.maxun.dev' }],
+          },
+        },
+      }),
+      true
+    );
+  });
+
+  it('rejects search output when requested formats are absent', () => {
+    assert.equal(
+      hasExpectedRobotOutput(
+        'search',
+        {
+          search: {
+            'Search Results': {
+              results: [{ title: 'Maxun', url: 'https://www.maxun.dev' }],
+            },
+          },
+        },
+        ['markdown']
+      ),
+      false
+    );
+  });
+
+  it('accepts search output when a requested serializable format is present', () => {
+    assert.equal(
+      hasExpectedRobotOutput(
+        'search',
+        {
+          search: {
+            'Search Results': {
+              results: [{ markdown: '# Maxun', url: 'https://www.maxun.dev' }],
+            },
+          },
+        },
+        ['markdown']
+      ),
+      true
+    );
+  });
+
+  it('rejects crawl output when every result is an error', () => {
+    assert.equal(
+      hasExpectedRobotOutput(
+        'crawl',
+        {
+          crawl: {
+            'Crawl Results': [{ error: 'Navigation failed' }],
+          },
+        },
+        ['text']
+      ),
+      false
+    );
+  });
+
+  it('continues to accept non-search and non-crawl robots', () => {
+    assert.equal(hasExpectedRobotOutput('extract', {}), true);
+  });
+});