diff --git a/modules/llama_cpp_server.py b/modules/llama_cpp_server.py
index 192aa9e4..1425844d 100644
--- a/modules/llama_cpp_server.py
+++ b/modules/llama_cpp_server.py
@@ -136,7 +136,7 @@ class LlamaServer:
 
         logit_bias = []
         if state['custom_token_bans']:
-            logit_bias.extend([[int(token_id), False] for token_id in state['custom_token_bans'].split(',')])
+            logit_bias.extend([[int(token_id.strip()), False] for token_id in state['custom_token_bans'].split(',') if token_id.strip()])
 
         if state.get('logit_bias'):
             for token_id_str, bias in state['logit_bias'].items():
diff --git a/modules/models_settings.py b/modules/models_settings.py
index 5e69b60e..0e117176 100644
--- a/modules/models_settings.py
+++ b/modules/models_settings.py
@@ -431,7 +431,8 @@ def load_instruction_template(template):
     else:
         return ''
 
-    file_contents = open(filepath, 'r', encoding='utf-8').read()
+    with open(filepath, 'r', encoding='utf-8') as f:
+        file_contents = f.read()
     data = yaml.safe_load(file_contents)
     if 'instruction_template' in data:
         return data['instruction_template']
diff --git a/modules/text_generation.py b/modules/text_generation.py
index 787c1814..d487cd2f 100644
--- a/modules/text_generation.py
+++ b/modules/text_generation.py
@@ -378,7 +378,7 @@ def generate_reply_HF(question, original_question, state, stopping_strings=None,
         generate_params['sampler_priority'] = [x.strip() for x in state['sampler_priority'].replace('\n', ',').split(',') if x.strip()]
 
     if state['custom_token_bans']:
-        to_ban = [int(x) for x in state['custom_token_bans'].split(',')]
+        to_ban = [int(x.strip()) for x in state['custom_token_bans'].split(',') if x.strip()]
         if len(to_ban) > 0:
             if generate_params.get('suppress_tokens', None):
                 generate_params['suppress_tokens'] += to_ban
diff --git a/modules/tool_use.py b/modules/tool_use.py
index d65c14ed..55424853 100644
--- a/modules/tool_use.py
+++ b/modules/tool_use.py
@@ -42,6 +42,9 @@ def load_tools(selected_names):
             continue
 
         func_name = tool_def.get('function', {}).get('name', name)
+        if func_name in executors:
+            logger.warning(f'Tool "{name}" declares function name "{func_name}" which conflicts with an already loaded tool. Skipping.')
+            continue
         tool_defs.append(tool_def)
         executors[func_name] = execute_fn
 
diff --git a/user_data/tools/calculate.py b/user_data/tools/calculate.py
index e88b71a3..94f74c41 100644
--- a/user_data/tools/calculate.py
+++ b/user_data/tools/calculate.py
@@ -16,7 +16,11 @@ def _eval(node):
     if isinstance(node, ast.Constant) and isinstance(node.value, (int, float)):
         return node.value
     elif isinstance(node, ast.BinOp) and type(node.op) in OPERATORS:
-        return OPERATORS[type(node.op)](_eval(node.left), _eval(node.right))
+        left = _eval(node.left)
+        right = _eval(node.right)
+        if isinstance(node.op, ast.Pow) and isinstance(right, (int, float)) and abs(right) > 10000:
+            raise ValueError("Exponent too large (max 10000)")
+        return OPERATORS[type(node.op)](left, right)
     elif isinstance(node, ast.UnaryOp) and type(node.op) in OPERATORS:
         return OPERATORS[type(node.op)](_eval(node.operand))
     raise ValueError(f"Unsupported expression")
diff --git a/user_data/tools/roll_dice.py b/user_data/tools/roll_dice.py
index 9cab48a8..4af38ddc 100644
--- a/user_data/tools/roll_dice.py
+++ b/user_data/tools/roll_dice.py
@@ -17,7 +17,7 @@ tool = {
 
 
 def execute(arguments):
-    count = arguments.get("count", 1)
-    sides = arguments.get("sides", 20)
+    count = max(1, min(arguments.get("count", 1), 1000))
+    sides = max(2, min(arguments.get("sides", 20), 1000))
     rolls = [random.randint(1, sides) for _ in range(count)]
     return {"rolls": rolls, "total": sum(rolls)}