SmolLM3-3B tool call fix: template bugs found and patched

model-files/chat_template.jinja

@@ -0,0 +1,102 @@
+{# ───── defaults ───── #}
+{%- if enable_thinking is not defined -%}
+{%- set enable_thinking = true -%}
+{%- endif -%}
+
+{# ───── reasoning mode ───── #}
+{%- if enable_thinking -%}
+  {%- set reasoning_mode = "/think" -%}
+{%- else -%}
+  {%- set reasoning_mode = "/no_think" -%}
+{%- endif -%}
+
+{# ───── header (system message) ───── #}
+{{- "<|im_start|>system\n" -}}
+
+{%- if messages[0].role == "system" -%}
+  {%- set system_message = messages[0].content -%}
+  {%- if "/no_think" in system_message -%}
+    {%- set reasoning_mode = "/no_think" -%}
+  {%- elif "/think" in system_message -%}
+    {%- set reasoning_mode = "/think" -%}
+  {%- endif -%}
+  {%- set custom_instructions = system_message.replace("/no_think", "").replace("/think", "").rstrip() -%}
+{%- endif -%}
+
+{%- if "/system_override" in system_message -%}
+  {{- custom_instructions.replace("/system_override", "").rstrip() -}}
+{%- else -%}
+  {{- "## Metadata\n\n" -}}
+  {{- "Knowledge Cutoff Date: June 2025\n" -}}
+  {%- set today = strftime_now("%d %B %Y") -%}
+  {{- "Today Date: " ~ today ~ "\n" -}}
+  {{- "Reasoning Mode: " + reasoning_mode + "\n\n" -}}
+
+  {{- "## Custom Instructions\n\n" -}}
+  {%- if custom_instructions -%}
+    {{- custom_instructions + "\n\n" -}}
+  {%- elif reasoning_mode == "/think" -%}
+    {{- "You are a helpful AI assistant named SmolLM, trained by Hugging Face.\n\n" -}}
+  {%- else -%}
+    {{- "You are a helpful AI assistant named SmolLM, trained by Hugging Face.\n\n" -}}
+  {%- endif -%}
+
+  {%- if xml_tools or python_tools or tools -%}
+    {{- "### Tools\n\n" -}}
+    {%- if xml_tools or tools -%}
+      {%- if tools -%}
+        {%- set xml_tools = tools -%}
+      {%- endif -%}
+      {%- set ns = namespace(xml_tool_string="You may call one or more functions to assist with the user query.\nYou are provided with function signatures within <tools></tools> XML tags:\n\n<tools>\n") -%}
+      {%- for tool in xml_tools[:] -%}
+        {%- set ns.xml_tool_string = ns.xml_tool_string ~ (tool | tojson) ~ "\n" -%}
+      {%- endfor -%}
+      {%- set xml_tool_string = ns.xml_tool_string + "</tools>\n\nFor each function call, return a json object with function name and arguments within <tool_call> XML tags:\n<tool_call>\n{\"name\": <function-name>, \"arguments\": <args-json-object>}\n</tool_call>" -%}
+      {{- xml_tool_string -}}
+    {%- endif -%}
+    {%- if python_tools -%}
+      {%- set ns = namespace(python_tool_string="You may call one or more functions as python tools.\n<tools>\n") -%}
+      {%- for tool in python_tools[:] -%}
+        {%- set ns.python_tool_string = ns.python_tool_string ~ (tool | string) ~ "\n" -%}
+      {%- endfor -%}
+      {%- set python_tool_string = ns.python_tool_string + "</tools>\n\nThe state persists between code executions." -%}
+      {{- python_tool_string -}}
+    {%- endif -%}
+    {{- "\n\n" -}}
+  {%- endif -%}
+{%- endif -%}
+{{- "<|im_end|>\n" -}}
+
+{# ───── main loop ───── #}
+{%- for message in messages -%}
+    {%- if message.role == "user" -%}
+        {{ "<|im_start|>user\n" + message.content + "<|im_end|>\n" }}
+    {%- elif message.role == "assistant" -%}
+        {% generation %}
+        {%- if message.tool_calls -%}
+            {%- set ns = namespace(tc_text="") -%}
+            {%- for tc in message.tool_calls -%}
+                {%- set ns.tc_text = ns.tc_text ~ "<tool_call>\n{\"name\": \"" ~ tc.function.name ~ "\", \"arguments\": " ~ tc.function.arguments ~ "}\n</tool_call>" -%}
+            {%- endfor -%}
+            {{ "<|im_start|>assistant\n" ~ (message.content if message.content is string else "") ~ ns.tc_text ~ "<|im_end|>\n" }}
+        {%- else -%}
+            {%- if reasoning_mode == "/think" -%}
+                {{ "<|im_start|>assistant\n<think>\n" ~ (message.content if message.content is string else "") ~ "\n</think><|im_end|>\n" }}
+            {%- else -%}
+                {{ "<|im_start|>assistant\n" ~ (message.content if message.content is string else "") ~ "<|im_end|>\n" }}
+            {%- endif -%}
+        {%- endif -%}
+        {% endgeneration %}
+    {%- elif message.role == "tool" -%}
+        {{ "<|im_start|>user\n<tool_response>\n" ~ (message.content if message.content is string else "") ~ "\n</tool_response><|im_end|>\n" }}
+    {%- endif -%}
+{%- endfor -%}
+
+{# ───── generation prompt ───── #}
+{%- if add_generation_prompt -%}
+    {%- if reasoning_mode == "/think" -%}
+        {{ "<|im_start|>assistant\n<think>\n" }}
+    {%- else -%}
+        {{ "<|im_start|>assistant\n" }}
+    {%- endif -%}
+{%- endif -%}