--- a/candolint/handlers.py	Wed Oct 26 06:52:26 2016 +0800
+++ b/candolint/handlers.py	Wed Oct 26 07:33:36 2016 +0800
@@ -101,6 +101,33 @@
         self.render('project.html', project=project, checks=checks)
 
 
+class AtomHandler(BaseHandler):
+    def get(self, domain, user, name):
+        project = get_project_or_404(domain, user, name)
+        checks = (Check
+            .select(Change, *Check.get_light_fields())
+            .join(Change)
+            .where(Check.project == project))
+        def status(check):
+            if not check.success:
+                return 'unknown'
+            elif check.errors or check.warnings:
+                status = []
+                if check.errors:
+                    msg = self.locale.translate(
+                        '{} error', '{} errors', check.errors)
+                    status.append(msg.format(check.errors))
+                if check.warnings:
+                    msg = self.locale.translate(
+                        '{} warning', '{} warnings', check.warnings)
+                    status.append(msg.format(check.warnings))
+                return ', '.join(status)
+            else:
+                return 'all clean'
+        self.set_header('Content-Type', 'application/atom+xml; charset=utf-8')
+        self.render('atom.xml', project=project, checks=checks, status=status)
+
+
 class CheckHandler(BaseHandler):
     def get(self, domain, user, name, check_num, format_='html'):
         project = get_project_or_404(domain, user, name)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/templates/atom.xml	Wed Oct 26 07:33:36 2016 +0800
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+    <icon>{{ request.protocol }}://{{ request.host }}/static/favicon-cat.png</icon>
+    <title>{{ project.name }} feed</title>
+    <id>{{ project.get_url(request) }}/atom</id>
+    <link href="{{ project.get_url(request) }}/atom" rel="self"/>
+    <link href="{{ project.get_url(request) }}"/>
+    {% set last = checks.first() %}
+    {% if last %}
+        <updated>{{ last.finished.isoformat() }}Z</updated>
+    {% else %}
+        <updated>1970-01-01T08:00:00</updated>
+    {% end %}
+
+    {% for check in checks.limit(20) %}
+        <entry>
+            <title>Check #{{ check.ordinal }}: {{ status(check) }}</title>
+            <id>{{ project.get_url(request) }}/{{ check.ordinal }}</id>
+            <link href="{{ project.get_url(request) }}/{{ check.ordinal }}"/>
+            <updated>{{ check.finished.isoformat() }}Z</updated>
+        </entry>
+    {% end %}
+</feed>

--- a/tests/test_viewer.py	Wed Oct 26 06:52:26 2016 +0800
+++ b/tests/test_viewer.py	Wed Oct 26 07:33:36 2016 +0800
@@ -108,6 +108,19 @@
         assert '1 warning' in response.body
         assert '<a href="#">default</a>' in response.body
 
+    def test_atom(self):
+        response = self.fetch('/example.com/alice/test-viewer/atom')
+        assert response.code == 200
+        assert 'atom+xml' in response.headers['Content-Type']
+        root = ElementTree.fromstring(response.body)
+        ns = {'atom': 'http://www.w3.org/2005/Atom'}
+        title = root.find('./atom:entry/atom:title', ns)
+        assert title is not None
+        assert title.text == 'Check #1: 1 error, 1 warning'
+        updates = [el.text for el in root.findall('.//atom:updated', ns)]
+        assert len(updates) == 2
+        assert updates[0] == updates[1] == '2016-08-20T02:38:53Z'
+
     def test_check(self):
         response = self.fetch('/butt.cloud/cyber/wizard-attack/latest')
         assert response.code == 404

--- a/viewer.py	Wed Oct 26 06:52:26 2016 +0800
+++ b/viewer.py	Wed Oct 26 07:33:36 2016 +0800
@@ -8,7 +8,7 @@
 from tornado.web import Application
 
 from candolint import uimodules
-from candolint.handlers import IndexHandler, ProjectHandler, CheckHandler, StatusHandler, ErrorHandler
+from candolint.handlers import IndexHandler, ProjectHandler, AtomHandler, CheckHandler, StatusHandler, ErrorHandler
 from candolint.models import database
 from candolint.utils import rel
 
@@ -19,6 +19,7 @@
         handlers = [
             (r'/', IndexHandler),
             (project_re, ProjectHandler),
+            (project_re + r'/atom', AtomHandler),
             (project_re + r'/(\d+|latest)(?:/(raw))?', CheckHandler),
             (project_re + r'/status\.svg', StatusHandler),
             (r'.*', ErrorHandler, {'status_code': 404})