diff --git a/frontend/src/lib/components/raw_apps/RawAppTemplatePicker.svelte b/frontend/src/lib/components/raw_apps/RawAppTemplatePicker.svelte
index c7f610d048..8a094fab6a 100644
--- a/frontend/src/lib/components/raw_apps/RawAppTemplatePicker.svelte
+++ b/frontend/src/lib/components/raw_apps/RawAppTemplatePicker.svelte
@@ -248,7 +248,10 @@
 	async function start(withPrompt: boolean) {
 		const template = templates[selectedTemplateIndex]
 
-		if (schemaMode === 'new' && newSchemaName && selectedDatatable && opWs) {
+		// Only for an app that keeps the data table: with creation off nothing names
+		// it, so making a schema in it is work the app will never refer to — and on
+		// a database that could not be read, a failure the user cannot act on.
+		if (tableCreationEnabled && schemaMode === 'new' && newSchemaName && selectedDatatable && opWs) {
 			try {
 				const { dbSchemaOpsWithPreviewScripts } = await import('$lib/components/dbOps')
 				const dbOps = dbSchemaOpsWithPreviewScripts({
@@ -379,9 +382,13 @@
 												size="sm"
 												class="w-40"
 											/>
-											{#if noUsableRole || rolesUnknown}
+											{#if noUsableRole || rolesUnknown || accessUnknown}
 												<span class="text-xs text-red-600 dark:text-red-400">
-													{rolesUnknown ? 'could not read its roles' : 'no role you can use'}
+													{rolesUnknown
+														? 'could not read its roles'
+														: accessUnknown
+															? 'could not reach it'
+															: 'no role you can use'}
 												</span>
 											{/if}
 											{#if showRolePicker}
diff --git a/system_prompts/generate.py b/system_prompts/generate.py
index a499871700..cf97b8c2fd 100644
--- a/system_prompts/generate.py
+++ b/system_prompts/generate.py
@@ -198,47 +198,9 @@ def extract_py_functions(content: str) -> list[dict]:
         if '.. deprecated::' in docstring:
             return
 
-        # Build parameter list
-        params = []
-        args = node.args
-
-        # Handle regular args
-        num_defaults = len(args.defaults)
-        num_args = len(args.args)
-
-        for i, arg in enumerate(args.args):
-            if arg.arg == 'self':
-                continue
-            param_str = arg.arg
-            if arg.annotation:
-                param_str += f": {ast.unparse(arg.annotation)}"
-            # Check if has default
-            default_idx = i - (num_args - num_defaults)
-            if default_idx >= 0:
-                default = args.defaults[default_idx]
-                param_str += f" = {ast.unparse(default)}"
-            params.append(param_str)
-
-        # Handle *args
-        if args.vararg:
-            params.append(f"*{args.vararg.arg}")
-        elif args.kwonlyargs:
-            # The bare separator is part of the signature: without it the advertised
-            # call is positional, and an agent following it gets a TypeError.
-            params.append('*')
-
-        # Handle keyword-only args
-        for i, arg in enumerate(args.kwonlyargs):
-            param_str = arg.arg
-            if arg.annotation:
-                param_str += f": {ast.unparse(arg.annotation)}"
-            if args.kw_defaults[i]:
-                param_str += f" = {ast.unparse(args.kw_defaults[i])}"
-            params.append(param_str)
-
-        # Handle **kwargs
-        if args.kwarg:
-            params.append(f"**{args.kwarg.arg}")
+        # One renderer for Python signatures — see `_format_py_params`, which also
+        # keeps the bare `*`, the positional-only `/` and annotated varargs.
+        params_str = _format_py_params(node, skip_self=True)
 
         # Get return type
         return_type = ''
@@ -248,7 +210,7 @@ def extract_py_functions(content: str) -> list[dict]:
         seen_names.add(node.name)
         functions.append({
             'name': node.name,
-            'params': ', '.join(params),
+            'params': params_str,
             'return_type': return_type,
             'docstring': docstring,
             'async': isinstance(node, ast.AsyncFunctionDef)