diff --git a/CLAUDE.md b/CLAUDE.md
index fa4ca3a..438bd41 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -5,7 +5,6 @@ Cooperative web platform: federated content, commerce, events, and media process
 ## Deployment
 
 - **Do NOT push** until explicitly told to. Pushes reload code to dev automatically.
-- **Cache busting:** After editing `sx.js`, bump the `?v=` query string in `shared/sx/helpers.py` (search for `sx.js?v=`).
 
 ## Project Structure
 
diff --git a/shared/sx/helpers.py b/shared/sx/helpers.py
index 4304d73..ddb2b7b 100644
--- a/shared/sx/helpers.py
+++ b/shared/sx/helpers.py
@@ -6,6 +6,8 @@ page elements (headers, search, etc.) from template context.
 """
 from __future__ import annotations
 
+import hashlib
+from pathlib import Path
 from typing import Any
 
 from markupsafe import escape
@@ -482,8 +484,8 @@ details.group{{overflow:hidden}}details.group>summary{{list-style:none}}details.
 <body class="bg-stone-50 text-stone-900">
 <script type="text/sx" data-components>{component_defs}</script>
 <script type="text/sx" data-mount="body">{page_sx}</script>
-<script src="{asset_url}/scripts/sx.js?v=20260301d"></script>
-<script src="{asset_url}/scripts/body.js"></script>
+<script src="{asset_url}/scripts/sx.js?v={sx_js_hash}"></script>
+<script src="{asset_url}/scripts/body.js?v={body_js_hash}"></script>
 </body>
 </html>"""
 
@@ -544,9 +546,25 @@ def sx_page(ctx: dict, page_sx: str, *,
         page_sx=page_sx,
         sx_css=sx_css,
         sx_css_classes=sx_css_classes,
+        sx_js_hash=_script_hash("sx.js"),
+        body_js_hash=_script_hash("body.js"),
     )
 
 
+_SCRIPT_HASH_CACHE: dict[str, str] = {}
+
+
+def _script_hash(filename: str) -> str:
+    """Compute MD5 hash of a static script file, cached for process lifetime."""
+    if filename not in _SCRIPT_HASH_CACHE:
+        try:
+            data = (Path("static") / "scripts" / filename).read_bytes()
+            _SCRIPT_HASH_CACHE[filename] = hashlib.md5(data).hexdigest()[:8]
+        except Exception:
+            _SCRIPT_HASH_CACHE[filename] = "dev"
+    return _SCRIPT_HASH_CACHE[filename]
+
+
 def _get_csrf_token() -> str:
     """Get the CSRF token from the current request context."""
     try:
