diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index fa80f7b..1a26145 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -7,6 +7,8 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    outputs:
+      buildlog: ${{steps.check.outputs.messages}}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -20,7 +22,10 @@ jobs:
       - name: Install Environment
         run: make setup
       - name: Build Documentation
-        run: make html/fast
+        run: make html/fast LOGFILE=_build_html.log
+      - name: Parse Build Logs
+        id: check
+        run: python check-build-logs.py _build_html.log "$GITHUB_OUTPUT"
       - name: Archive Documentation
         run: make archive/fast
       - name: Upload Archive
@@ -29,6 +34,15 @@ jobs:
           if-no-files-found: error
           name: github-pages
           path: ${{github.workspace}}/cps-docs.tar
+  check:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Check Sphinx logs
+        shell: bash
+        run: |
+          echo -e "${{needs.check.outputs.messages}}"
+          [ -z "${{needs.check.outputs.messages}}" ]
   deploy:
     if: github.event.repository.default_branch == github.ref_name
     needs: build
diff --git a/Makefile b/Makefile
index 4467f60..a3a565c 100644
--- a/Makefile
+++ b/Makefile
@@ -40,6 +40,7 @@ endif
 setup.flags += --with=docs
 
 build.flags += $(if $(BUILDER),-b $(BUILDER),-b html)
+build.flags += $(if $(LOGFILE),-w "$(LOGFILE)")
 build.flags += $(if $(NOCOLOR),,--color)
 build.flags += $(SPHINXOPTS)
 
diff --git a/check-build-logs.py b/check-build-logs.py
new file mode 100755
index 0000000..883471a
--- /dev/null
+++ b/check-build-logs.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+
+import os
+import re
+import sys
+
+from typing import List
+
+# -----------------------------------------------------------------------------
+def read_log(path: str) -> List[str]:
+    out = []
+
+    with open(path, 'rt') as f:
+        for line in f:
+            out.append(re.sub('\033[[][0-9;]*m', '', line.strip()))
+
+    return out
+
+# -----------------------------------------------------------------------------
+def main(log_path: str, out_path: str, src_root: str = '.'):
+    re_loc = r'(?P<file>[^:]+):((?P<line>[0-9]+):)?\s*'
+    re_info = r'(?P<type>\w+):\s*(?P<message>.*)'
+    lines = read_log(log_path)
+
+    messages = []
+    for line in lines:
+        m = re.match(re_loc + re_info, line)
+        if m:
+            t = m.group('type').lower()
+            if t not in {'warning', 'error'}:
+                t = 'warning'
+
+            params = {'file': os.path.relpath(m.group('file'), src_root)}
+            line = m.group('line')
+            if line:
+                params['line'] = line
+
+            p = ','.join([f'{k}={v}' for k, v in params.items()])
+            m = m.group('message')
+            messages.append(f'::{t} {p}::{m}')
+
+    if len(messages):
+        print(messages)
+        s = '\\n'.join([m.replace('\\', '\\\\') for m in messages])
+        with open(out_path, 'at') as f:
+            f.write(f'messages={s}\n')
+
+# %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+if __name__ == '__main__':
+    main(*sys.argv[1:])