Enforce canonical math system and text-only chat

chat_template.jinja

@@ -1,53 +1,23 @@
-{{- '<|endoftext|>' }}
+{%- set system_prompt = 'You are a helpful assistant.\nPlease reason step by step, and put your final answer within \\boxed{}.' %}
 {%- if tools %}
-    {{- '<|im_start|>system\n' }}
-    {%- if messages[0]['role'] == 'system' %}
-        {{- messages[0]['content'] }}
-    {%- else %}
-        {{- 'You are a helpful assistant.' }}
-    {%- endif %}
-    {{- "\n\n# Tools\n\nYou may call one or more functions to assist with the user query.\n\nYou are provided with function signatures within <tools></tools> XML tags:\n<tools>" }}
-    {%- for tool in tools %}
-        {{- "\n" }}
-        {{- tool | tojson }}
-    {%- endfor %}
-    {{- "\n</tools>\n\nFor each function call, return a json object with function name and arguments within <tool_call></tool_call> XML tags:\n<tool_call>\n{\"name\": <function-name>, \"arguments\": <args-json-object>}\n</tool_call><|im_end|>\n" }}
-{%- else %}
-    {%- if messages[0]['role'] == 'system' %}
-        {{- '<|im_start|>system\n' + messages[0]['content'] + '<|im_end|>\n' }}
-    {%- else %}
-        {{- '<|im_start|>system\nYou are a helpful assistant.<|im_end|>\n' }}
-    {%- endif %}
+    {{- raise_exception('Limite Violetto supports text-only chat; tools are not supported.') }}
 {%- endif %}
+{{- '<|endoftext|><|im_start|>system\n' + system_prompt + '<|im_end|>\n' }}
 {%- for message in messages %}
-    {%- if (message.role == "user") or (message.role == "system" and not loop.first) or (message.role == "assistant" and not message.tool_calls) %}
-        {{- '<|im_start|>' + message.role + '\n' + message.content + '<|im_end|>' + '\n' }}
-    {%- elif message.role == "assistant" %}
-        {{- '<|im_start|>' + message.role }}
-        {%- if message.content %}
-            {{- '\n' + message.content }}
-        {%- endif %}
-        {%- for tool_call in message.tool_calls %}
-            {%- if tool_call.function is defined %}
-                {%- set tool_call = tool_call.function %}
-            {%- endif %}
-            {{- '\n<tool_call>\n{"name": "' }}
-            {{- tool_call.name }}
-            {{- '", "arguments": ' }}
-            {{- tool_call.arguments | tojson }}
-            {{- '}\n</tool_call>' }}
-        {%- endfor %}
-        {{- '<|im_end|>\n' }}
-    {%- elif message.role == "tool" %}
-        {%- if (loop.index0 == 0) or (messages[loop.index0 - 1].role != "tool") %}
-            {{- '<|im_start|>user' }}
-        {%- endif %}
-        {{- '\n<tool_response>\n' }}
-        {{- message.content }}
-        {{- '\n</tool_response>' }}
-        {%- if loop.last or (messages[loop.index0 + 1].role != "tool") %}
-            {{- '<|im_end|>\n' }}
+    {%- if (message.tool_calls is defined and message.tool_calls is not none) or (message.function_call is defined and message.function_call is not none) %}
+        {{- raise_exception('Limite Violetto supports text-only chat; tool calls are not supported.') }}
+    {%- endif %}
+    {%- if message.content is not string %}
+        {{- raise_exception('Limite Violetto supports text-only chat; message content must be a string.') }}
+    {%- endif %}
+    {%- if message.role == 'system' %}
+        {%- if message.content != system_prompt %}
+            {{- raise_exception('Limite Violetto requires its fixed mathematical system prompt; custom system messages are not supported.') }}
         {%- endif %}
+    {%- elif message.role == 'user' or message.role == 'assistant' %}
+        {{- '<|im_start|>' + message.role + '\n' + message.content + '<|im_end|>\n' }}
+    {%- else %}
+        {{- raise_exception('Limite Violetto supports only user, assistant, and the exact canonical system message; other roles are not supported.') }}
     {%- endif %}
 {%- endfor %}
 {%- if add_generation_prompt %}