diff --git a/.github/workflows/validate-scripts-json.yml b/.github/workflows/validate-scripts-json.yml
new file mode 100644
index 0000000..9e15984
--- /dev/null
+++ b/.github/workflows/validate-scripts-json.yml
@@ -0,0 +1,23 @@
+name: Validate scripts.json
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'scripts.json'
+      - 'tools/validate_scripts.py'
+      - '.github/workflows/validate-scripts-json.yml'
+  pull_request:
+    paths:
+      - 'scripts.json'
+      - 'tools/validate_scripts.py'
+      - '.github/workflows/validate-scripts-json.yml'
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: astral-sh/setup-uv@v8.1.0
+      - name: Validate scripts.json
+        run: uv run tools/validate_scripts.py --scripts-json scripts.json
diff --git a/tools/validate_scripts.py b/tools/validate_scripts.py
new file mode 100644
index 0000000..fe82ae1
--- /dev/null
+++ b/tools/validate_scripts.py
@@ -0,0 +1,133 @@
+#!/usr/bin/env python3
+"""
+Validate scripts.json against the expected schema.
+
+Exit 0 = valid or warnings only, Exit 1 = errors found.
+"""
+
+import argparse
+import json
+import sys
+from pathlib import Path
+
+KNOWN_CATEGORIES = {
+    "Audio & Media",
+    "Flight Controller Config",
+    "Games & Fun",
+    "GPS & Mapping",
+    "Logging & Analysis",
+    "Radio Tools",
+    "Telemetry & Widgets",
+}
+
+REQUIRED_FIELDS = ["name", "category", "description", "infourl", "tags"]
+STRING_FIELDS = ["name", "category", "description", "infourl"]
+
+
+def load_and_parse(path: Path) -> list:
+    if not path.exists():
+        print(f"Error: {path} not found", file=sys.stderr)
+        sys.exit(1)
+    try:
+        with open(path, encoding="utf-8") as f:
+            data = json.load(f)
+    except OSError as e:
+        print(f"Error: unable to read {path}: {e}", file=sys.stderr)
+        sys.exit(1)
+    except json.JSONDecodeError as e:
+        print(f"Error: invalid JSON in {path}: {e}", file=sys.stderr)
+        sys.exit(1)
+    if not isinstance(data, list):
+        print(f"Error: {path} must be a JSON array", file=sys.stderr)
+        sys.exit(1)
+    return data
+
+
+def validate(data: list) -> tuple[list[str], list[str]]:
+    errors = []
+    warnings = []
+    seen_names: dict[str, int] = {}
+
+    for i, entry in enumerate(data):
+        prefix = f"Entry {i}"
+
+        if not isinstance(entry, dict):
+            errors.append(f"{prefix}: not an object")
+            continue
+
+        for field in REQUIRED_FIELDS:
+            if field not in entry:
+                errors.append(f"{prefix}: missing required field '{field}'")
+
+        for field in STRING_FIELDS:
+            if field in entry:
+                if not isinstance(entry[field], str) or not entry[field].strip():
+                    errors.append(f"{prefix}: '{field}' must be a non-empty string")
+
+        category = entry.get("category")
+        if isinstance(category, str) and category.strip() and category not in KNOWN_CATEGORIES:
+            errors.append(
+                f"{prefix}: unknown category '{category}'"
+                f" (known: {sorted(KNOWN_CATEGORIES)})"
+            )
+
+        infourl = entry.get("infourl")
+        if isinstance(infourl, str) and infourl.strip():
+            if not (infourl.startswith("http://") or infourl.startswith("https://")):
+                errors.append(f"{prefix}: 'infourl' must start with http:// or https://")
+
+        if "images" not in entry:
+            warnings.append(f"{prefix}: 'images' should be a non-empty list")
+        elif not isinstance(entry["images"], list):
+            errors.append(f"{prefix}: 'images' must be a list")
+        elif len(entry["images"]) == 0:
+            warnings.append(f"{prefix}: 'images' should be a non-empty list")
+
+        if "tags" in entry and (
+            not isinstance(entry["tags"], list) or len(entry["tags"]) == 0
+        ):
+            errors.append(f"{prefix}: 'tags' must be a non-empty list")
+
+        name = entry.get("name")
+        if isinstance(name, str) and name.strip():
+            key = name.strip().lower()
+            if key in seen_names:
+                errors.append(
+                    f"{prefix}: duplicate name '{name}'"
+                    f" (also at entry {seen_names[key]})"
+                )
+            else:
+                seen_names[key] = i
+
+    return errors, warnings
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description="Validate scripts.json schema")
+    parser.add_argument(
+        "--scripts-json",
+        default="scripts.json",
+        type=Path,
+        help="Path to scripts.json (default: scripts.json)",
+    )
+    args = parser.parse_args()
+
+    data = load_and_parse(args.scripts_json)
+    errors, warnings = validate(data)
+
+    if warnings:
+        print(f"Found {len(warnings)} warning(s) in {args.scripts_json}:", file=sys.stderr)
+        for warning in warnings:
+            print(f"  - {warning}", file=sys.stderr)
+
+    if errors:
+        print(f"Found {len(errors)} error(s) in {args.scripts_json}:")
+        for error in errors:
+            print(f"  - {error}")
+        sys.exit(1)
+
+    print(f"{args.scripts_json} is valid ({len(data)} entries).")
+
+
+if __name__ == "__main__":
+    main()