diff --git a/.github/scripts/validate_json.py b/.github/scripts/validate_json.py
new file mode 100644
index 0000000..b4b82c3
--- /dev/null
+++ b/.github/scripts/validate_json.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+"""Validate that all JSON files under the schema directory are well-formed."""
+
+import json
+import sys
+from pathlib import Path
+
+
+def validate_json_files(schema_dir: str) -> int:
+    """Validate every *.json file found under schema_dir.
+
+    Returns 0 if all files are valid, 1 if any file is invalid.
+    """
+    has_error = False
+    json_files = sorted(Path(schema_dir).rglob("*.json"))
+
+    if not json_files:
+        print(f"No JSON files found under '{schema_dir}'.")
+        return 0
+
+    for filepath in json_files:
+        try:
+            with open(filepath, encoding="utf-8") as f:
+                json.load(f)
+            print(f"VALID: {filepath}")
+        except (json.JSONDecodeError, OSError, UnicodeDecodeError) as exc:
+            print(f"INVALID: {filepath} — {exc}", file=sys.stderr)
+            has_error = True
+
+    return 1 if has_error else 0
+
+
+if __name__ == "__main__":
+    directory = sys.argv[1] if len(sys.argv) > 1 else "schema"
+    sys.exit(validate_json_files(directory))
diff --git a/.github/workflows/validate-json.yml b/.github/workflows/validate-json.yml
new file mode 100644
index 0000000..a22bf8f
--- /dev/null
+++ b/.github/workflows/validate-json.yml
@@ -0,0 +1,20 @@
+name: Validate JSON Schema Files
+
+on:
+  pull_request:
+    paths:
+      - 'schema/**'
+      - '.github/scripts/validate_json.py'
+      - '.github/workflows/validate-json.yml'
+
+jobs:
+  validate-json:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Validate JSON files in schema directory
+        run: python3 .github/scripts/validate_json.py schema