diff --git a/tools/ingest_mod.py b/tools/ingest_mod.py
new file mode 100644
index 00000000..013715e6
--- /dev/null
+++ b/tools/ingest_mod.py
@@ -0,0 +1,185 @@
+#!/usr/bin/env python3
+"""
+Ingest a community mod's entity art into the Spire Codex CDN layout.
+
+The run and live pages fall back to modded art (after main and beta) by
+fetching `<raw_base>/<paths[type]>/<id>.<ext>` from a mod's image repo. For
+mods shipped as a Godot `.pck` (Workshop/Nexus) or as a loose folder repo
+(e.g. WatcherMod), this tool extracts the entity art and normalizes it to the
+same id-named layout the site serves, staged under
+`extraction/mods/<key>/<type>/<id>.webp` for upload to the CDN.
+
+It does not need the game running: a `.pck` is unpacked statically with GDRE
+Tools, exactly like the main pipeline in update.py.
+
+Usage:
+  # Loose-folder repo already on disk (clone first):
+  python3 tools/ingest_mod.py --key watcher --source /tmp/WatcherMod/Watcher/images
+
+  # Mod shipped as a .pck (GDRE-unpacked, then descend --base to the image root):
+  python3 tools/ingest_mod.py --key somemod --source /path/to/mod.pck --base assets/images
+
+The per-type subpaths and the source image extension come from data/mods.json
+(keyed by --key), so the input layout matches what the frontend expects.
+
+Requirements:
+  - Python 3.10+
+  - Pillow (pip install pillow)
+  - GDRE Tools on PATH, only when --source is a .pck
+    (https://github.com/bruvzg/gdsdecomp/releases)
+"""
+import argparse
+import json
+import shutil
+import subprocess
+import sys
+import tempfile
+from pathlib import Path
+
+try:
+    from PIL import Image
+except ImportError:
+    print("ERROR: Pillow is required. Install with: pip install pillow")
+    sys.exit(1)
+
+# ── Project paths ──────────────────────────────────────────────────────────────
+
+ROOT = Path(__file__).resolve().parent.parent
+MODS_JSON = ROOT / "data" / "mods.json"
+DEFAULT_OUT = ROOT / "extraction" / "mods"
+
+# Source images may carry any common raster extension regardless of what the
+# mod's repo advertises, so the glob stays lenient.
+IMAGE_EXTS = (".png", ".webp", ".jpg", ".jpeg")
+
+
+# ── Helpers ────────────────────────────────────────────────────────────────────
+
+def run(cmd: list[str]) -> subprocess.CompletedProcess:
+    """Run a command, printing it first."""
+    print("  $ " + " ".join(str(c) for c in cmd))
+    return subprocess.run(cmd, check=True)
+
+
+def find_executable(name: str, alt_names: list[str] | None = None) -> str | None:
+    """Find an executable on PATH, trying alternate names."""
+    for n in [name] + (alt_names or []):
+        path = shutil.which(n)
+        if path:
+            return path
+    return None
+
+
+def load_mod(key: str) -> dict:
+    """The data/mods.json entry for ``key``, or exit with a clear message."""
+    if not MODS_JSON.exists():
+        print(f"ERROR: {MODS_JSON} not found.")
+        sys.exit(1)
+    with open(MODS_JSON, "r", encoding="utf-8") as f:
+        mods = json.load(f).get("mods", [])
+    for mod in mods:
+        if mod.get("key") == key:
+            return mod
+    known = ", ".join(m.get("key", "?") for m in mods) or "(none)"
+    print(f"ERROR: no mod with key '{key}' in {MODS_JSON}. Known keys: {known}")
+    sys.exit(1)
+
+
+def extract_pck(pck_path: Path) -> Path:
+    """GDRE-unpack a .pck into a temp dir and return the unpack root."""
+    gdre = find_executable("gdre_tools", ["gdre_tools.exe", "gdre"])
+    if not gdre:
+        print("ERROR: gdre_tools not found on PATH (needed for .pck sources).")
+        print("  Install from: https://github.com/bruvzg/gdsdecomp/releases")
+        sys.exit(1)
+    out = Path(tempfile.mkdtemp(prefix="spire-mod-pck-"))
+    print(f"  Unpacking {pck_path.name} with GDRE -> {out}")
+    run([gdre, "--headless", f"--recover={pck_path}", f"--output-dir={out}"])
+    return out
+
+
+def convert_type(src_dir: Path, dest_dir: Path) -> int:
+    """Normalize every image in ``src_dir`` to id-named webp in ``dest_dir``.
+
+    The id is the source filename stem, lowercased, matching the in-game entity
+    id convention the site serves by. Returns the count written.
+    """
+    if not src_dir.is_dir():
+        print(f"  - {src_dir} missing, skipping")
+        return 0
+    images = sorted(
+        p for p in src_dir.iterdir()
+        if p.is_file() and p.suffix.lower() in IMAGE_EXTS
+    )
+    if not images:
+        print(f"  - {src_dir} has no images, skipping")
+        return 0
+    dest_dir.mkdir(parents=True, exist_ok=True)
+    count = 0
+    for img in images:
+        out_path = dest_dir / f"{img.stem.lower()}.webp"
+        try:
+            with Image.open(img) as im:
+                im.convert("RGBA").save(out_path, "WEBP", quality=90, method=6)
+            count += 1
+        except Exception as exc:
+            print(f"  ! {img.name}: {exc}")
+    return count
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(
+        description="Ingest a mod's entity art into the Spire Codex CDN layout.",
+    )
+    parser.add_argument("--key", required=True,
+                        help="mod key in data/mods.json (e.g. watcher)")
+    parser.add_argument("--source", required=True,
+                        help="image-root folder, or a .pck file to unpack")
+    parser.add_argument("--base", default="",
+                        help="subpath within the source (or unpacked .pck) "
+                             "that holds the per-type image folders")
+    parser.add_argument("--out", default=str(DEFAULT_OUT),
+                        help=f"staging root (default: {DEFAULT_OUT})")
+    args = parser.parse_args()
+
+    mod = load_mod(args.key)
+    paths = mod.get("paths", {})
+    if not paths:
+        print(f"ERROR: mod '{args.key}' has no 'paths' map in {MODS_JSON}.")
+        sys.exit(1)
+
+    source = Path(args.source).expanduser()
+    if not source.exists():
+        print(f"ERROR: source not found: {source}")
+        sys.exit(1)
+
+    cleanup: Path | None = None
+    if source.is_file() and source.suffix.lower() == ".pck":
+        image_root = extract_pck(source)
+        cleanup = image_root
+    else:
+        image_root = source
+    if args.base:
+        image_root = image_root / args.base
+
+    out_root = Path(args.out).expanduser() / args.key
+    print(f"Ingesting '{mod.get('name', args.key)}' from {image_root}")
+    print(f"  -> {out_root}\n")
+
+    total = 0
+    for etype, sub in paths.items():
+        written = convert_type(image_root / sub, out_root / etype)
+        if written:
+            print(f"  {etype}: {written} image(s)")
+        total += written
+
+    if cleanup:
+        shutil.rmtree(cleanup, ignore_errors=True)
+
+    print(f"\nDone. {total} image(s) staged under {out_root}")
+    if total:
+        print("Upload this tree to the CDN so the site can fall back to it.")
+
+
+if __name__ == "__main__":
+    main()