diff --git a/.github/workflows/bare-citations-check.yml b/.github/workflows/bare-citations-check.yml
new file mode 100644
index 0000000..dcf3588
--- /dev/null
+++ b/.github/workflows/bare-citations-check.yml
@@ -0,0 +1,21 @@
+name: Find bare citations
+
+on:
+  pull_request:
+    branches: [ main, master ]
+  push:
+    branches: [ main, master ]
+
+jobs:
+  format-code:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+
+      - name: Run checker script
+        run: python src/find_bare_citations.py src/references.bib src/index.md 
\ No newline at end of file
diff --git a/src/find_bare_citations.py b/src/find_bare_citations.py
new file mode 100644
index 0000000..6e22f62
--- /dev/null
+++ b/src/find_bare_citations.py
@@ -0,0 +1,103 @@
+# Find bare citation keys, e.g. shalev2022ham2pose, and add "@" e.g @shalev2022ham2pose
+# Does this by reading the citation keys from references.bib and checking the markdown for matches.
+# Written with ChatGPT assistance
+# https://chatgpt.com/share/68cde216-5aeb-41e1-a4b2-93e0855f6b98
+# https://chatgpt.com/share/00b023dc-74b8-4cd1-8b78-eadf39658688
+# https://chatgpt.com/share/3c145c68-dc38-43f0-a2b1-27d3cd1d43f5
+import re
+import sys
+from pathlib import Path
+import argparse
+import timeit
+import uuid
+from typing import Generator, List, Tuple
+
+
+def extract_citation_keys(bib_file_path:Path) ->List[str]:
+    content = bib_file_path.read_text()
+    citation_keys = re.findall(r"@\w+\{([^,]+),", content)
+    return citation_keys
+
+def find_bare_citations(markdown_file_path: Path, citation_keys: List) -> Generator[Tuple[str, List[str]], None, None ]:
+    content = markdown_file_path.read_text()
+
+    # Remove HTML comments. regex from https://stackoverflow.com/a/28208465
+    content = re.sub(r"<!--.*?-->", "", content, flags=re.DOTALL)
+
+    # Remove Markdown code blocks, regex from https://stackoverflow.com/a/64116935
+    markdown_code_block_pattern = re.compile(r'```[^`]*```', re.DOTALL)
+    content = markdown_code_block_pattern.sub('', content)
+
+    for citation_key in citation_keys:
+        # Find all positions of the citation key without the @ symbol
+        key_pattern = re.compile(re.escape(citation_key))
+        matches = []
+        for match in key_pattern.finditer(content):
+            start_index = match.start()
+            # Check if the citation key is not immediately preceded by an @ symbol
+            if '@' not in content[start_index-1:start_index]:
+                # if the @ is missing, pull out the whole line and return it. 
+                line_start = content.rfind('\n', 0, start_index) + 1
+                line_end = content.find('\n', start_index)
+                if line_end == -1:
+                    line_end = len(content)
+                line = content[line_start:line_end]
+                matches.append(line)
+            
+            
+
+        if matches:
+            yield citation_key, matches
+
+
+if __name__ == "__main__":
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "bib_file_path",
+        type=Path
+    )
+
+    parser.add_argument(
+        "markdown_file_path",
+        type=Path
+    )
+
+
+    args = parser.parse_args()
+
+    print(f"Parsing {args.bib_file_path} for citations")
+    extract_citations_start = timeit.default_timer()
+    citation_keys = extract_citation_keys(args.bib_file_path)
+    extract_citations_time = timeit.default_timer() - extract_citations_start
+    print(f"Finding citations took {extract_citations_time} seconds")
+
+
+    print(f"Bibliography had {len(citation_keys)} citations")
+
+    print(f"Beginning bare-citations check: checking {args.markdown_file_path}")
+
+    start_time = timeit.default_timer()
+    issues = find_bare_citations(args.markdown_file_path, citation_keys)
+
+
+    print("Found the following lines with bare citations:")
+    print()
+
+    # we cannot simply check "if issues" due to using yield
+    issues_exist = False 
+    for citation_key, matches in issues:
+        print(f"Citation key: {citation_key}: {len(matches)} bare citations")
+
+        for i, match in enumerate(matches):
+            print(f"{i}: {match}")
+
+            # iff we've gotten here then issues exist and we should set return value to 1 at the end. 
+            issues_exist = True
+        print()
+    elapsed_time = timeit.default_timer() - start_time
+    print(f"Bare-citation check complete after ~{elapsed_time} seconds")
+    if issues_exist:
+        sys.exit(1)  # exit with an error
+
+