diff --git a/.github/workflows/show_specification_annotations.yml b/.github/workflows/show_specification_annotations.yml
new file mode 100644
index 00000000..f7d7b398
--- /dev/null
+++ b/.github/workflows/show_specification_annotations.yml
@@ -0,0 +1,21 @@
+name: Show Specification Annotations
+
+on:
+  pull_request:
+    paths:
+      - 'tests/**'
+
+jobs:
+  annotate:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+
+      - name: Generate Annotations
+        run: pip install uritemplate && bin/annotate-specification-links
diff --git a/bin/annotate-specification-links b/bin/annotate-specification-links
new file mode 100755
index 00000000..eebc7e34
--- /dev/null
+++ b/bin/annotate-specification-links
@@ -0,0 +1,115 @@
+#!/usr/bin/env python3
+"""
+Annotate pull requests to the GitHub repository with links to specifications.
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any
+import json
+import re
+import sys
+
+from uritemplate import URITemplate
+
+
+BIN_DIR = Path(__file__).parent
+TESTS = BIN_DIR.parent / "tests"
+URLS = json.loads(BIN_DIR.joinpath("specification_urls.json").read_text())
+
+
+def urls(version: str) -> dict[str, URITemplate]:
+    """
+    Retrieve the version-specific URLs for specifications.
+    """
+    for_version = {**URLS["json-schema"][version], **URLS["external"]}
+    return {k: URITemplate(v) for k, v in for_version.items()}
+
+
+def annotation(
+    path: Path,
+    message: str,
+    line: int = 1,
+    level: str = "notice",
+    **kwargs: Any,
+) -> str:
+    """
+    Format a GitHub annotation.
+
+    See https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions
+    for full syntax.
+    """
+
+    if kwargs:
+        additional = "," + ",".join(f"{k}={v}" for k, v in kwargs.items())
+    else:
+        additional = ""
+
+    relative = path.relative_to(TESTS.parent)
+    return f"::{level} file={relative},line={line}{additional}::{message}\n"
+
+
+def line_number_of(path: Path, case: dict[str, Any]) -> int:
+    """
+    Crudely find the line number of a test case.
+    """
+    with path.open() as file:
+        description = case["description"]
+        return next(
+            (i + 1 for i, line in enumerate(file, 1) if description in line),
+            1,
+        )
+
+
+def main():
+    # Clear annotations which may have been emitted by a previous run.
+    sys.stdout.write("::remove-matcher owner=me::\n")
+
+    for version in TESTS.iterdir():
+        if version.name in {"draft-next", "latest"}:
+            continue
+
+        version_urls = urls(version.name)
+
+        for path in version.rglob("*.json"):
+            try:
+                contents = json.loads(path.read_text())
+            except json.JSONDecodeError as error:
+                error = annotation(
+                    level="error",
+                    path=path,
+                    line=error.lineno,
+                    col=error.pos + 1,
+                    title=str(error),
+                )
+                sys.stdout.write(error)
+
+            for test_case in contents:
+                specifications = test_case.get("specification")
+                if specifications is not None:
+                    for each in specifications:
+                        quote = each.pop("quote", "")
+                        (kind, section), = each.items()
+
+                        number = re.search(r"\d+", kind)
+                        spec = "" if number is None else number.group(0)
+
+                        url = version_urls[kind].expand(
+                            spec=spec,
+                            section=section,
+                        )
+
+                        message = f"{url}\n\n{quote}" if quote else url
+                        sys.stdout.write(
+                            annotation(
+                                path=path,
+                                line=line_number_of(path, test_case),
+                                title="Specification Link",
+                                message=message,
+                            ),
+                        )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/bin/specification_urls.json b/bin/specification_urls.json
new file mode 100644
index 00000000..9b985e97
--- /dev/null
+++ b/bin/specification_urls.json
@@ -0,0 +1,34 @@
+{
+  "json-schema": {
+    "draft2020-12": {
+      "core": "https://json-schema.org/draft/2020-12/draft-bhutton-json-schema-01#section-{section}",
+      "validation": "https://json-schema.org/draft/2020-12/draft-bhutton-json-schema-validation-01#section-{section}"
+    },
+    "draft2019-09": {
+      "core": "https://json-schema.org/draft/2019-09/draft-handrews-json-schema-02#rfc.section.{section}",
+      "validation": "https://json-schema.org/draft/2019-09/draft-handrews-json-schema-validation-02#rfc.section.{section}"
+    },
+    "draft7": {
+      "core": "https://json-schema.org/draft-07/draft-handrews-json-schema-01#rfc.section.{section}",
+      "validation": "https://json-schema.org/draft-07/draft-handrews-json-schema-validation-01#rfc.section.{section}"
+    },
+    "draft6": {
+      "core": "https://json-schema.org/draft-06/draft-wright-json-schema-01#rfc.section.{section}",
+      "validation": "https://json-schema.org/draft-06/draft-wright-json-schema-validation-01#rfc.section.{section}"
+    },
+    "draft4": {
+      "core": "https://json-schema.org/draft-04/draft-zyp-json-schema-04#rfc.section.{section}",
+      "validation": "https://json-schema.org/draft-04/draft-fge-json-schema-validation-00#rfc.section.{section}"
+    },
+    "draft3": {
+      "core": "https://json-schema.org/draft-03/draft-zyp-json-schema-03.pdf"
+    }
+  },
+
+  "external": {
+    "ecma262": "https://262.ecma-international.org/{section}",
+    "perl5": "https://perldoc.perl.org/perlre#{section}",
+    "rfc": "https://www.rfc-editor.org/rfc/{spec}.txt#{section}",
+    "iso": "https://www.iso.org/obp/ui"
+  }
+}