chat_template.jinja

{%- macro tool_to_json(tool) -%}
    {%- set ns_tool = namespace(first=true) -%}
    {{- '{' -}}
    {%- for k, v in tool.items() -%}
        {%- if k != 'defer_loading' and k != 'strict' -%}
            {%- if not ns_tool.first -%}{{- ', ' -}}{%- endif -%}
            {%- set ns_tool.first = false -%}
            {{- '"' ~ k ~ '": ' ~ (v | tojson(ensure_ascii=False)) -}}
        {%- endif -%}
    {%- endfor -%}
    {{- '}' -}}
{%- endmacro -%}
{%- set enable_thinking = enable_thinking if enable_thinking is defined else True %}
{%- set low_effort = low_effort if low_effort is defined else False %}
{%- if reasoning_effort is defined and reasoning_effort is not none %}
    {%- set low_effort = reasoning_effort == "low" %}
{%- endif %}
{%- set truncate_history_thinking = truncate_history_thinking if truncate_history_thinking is defined else True %}

{%- set ns = namespace(last_user_idx = -1) %}
{%- set loop_messages = messages %}
{%- for m in loop_messages %}
  {%- if m["role"] == "user" %}
    {%- set ns.last_user_idx = loop.index0 %}
  {%- endif %}
{%- endfor %}

{%- if messages[0]["role"] == "system" %}
    {%- set system_message = messages[0]["content"] %}
    {%- set loop_messages = messages[1:] %}
{%- else %}
    {%- set system_message = "" %}
    {%- set loop_messages = messages %}
{%- endif %}
{%- if not tools is defined %}
    {%- set tools = [] %}
{%- endif %}
{# Recompute last_user_idx relative to loop_messages after handling system #}
{%- set ns = namespace(last_user_idx = -1) %}
{%- for m in loop_messages %}
  {%- if m["role"] == "user" %}
    {%- set ns.last_user_idx = loop.index0 %}
  {%- endif %}
{%- endfor %}
{%- if system_message is defined %}
    {{- "<|im_start|>system\n" + system_message }}
{%- else %}
    {%- if tools is iterable and tools | length > 0 %}
        {{- "<|im_start|>system\n" }}
    {%- endif %}
{%- endif %}
{%- if tools is iterable and tools | length > 0 %}
    {%- if system_message is defined and system_message | length > 0 %}
        {{- "\n\n" }}
    {%- endif %}
    {{- "# Tools\n\nYou have access to the following functions:\n\n" }}
    {{- "<tools>" }}
    {%- for tool in tools %}
        {%- if tool.function is defined %}
            {%- set tool = tool.function %}
        {%- endif %}
        {%- if tool.defer_loading is not defined or not tool.defer_loading %}
            {{- '\n' ~ tool_to_json(tool) }}
        {%- endif %}
    {%- endfor %}
    {{- "\n</tools>" }}

    {{- '\n\nIf you choose to call a function ONLY reply in the following format with NO suffix:\n\n<tool_call>\n<function=example_function_name>\n<parameter=example_parameter_1>\nvalue_1\n</parameter>\n<parameter=example_parameter_2>\nThis is the value for the second parameter\nthat can span\nmultiple lines\n</parameter>\n</function>\n</tool_call>\n\n<IMPORTANT>\nReminder:\n- Function calls MUST follow the specified format: an inner <function=...></function> block must be nested within <tool_call></tool_call> XML tags\n- Required parameters MUST be specified\n- You may provide optional reasoning for your function call in natural language BEFORE the function call, but NOT after\n- If there is no function call available, answer the question like normal with your current knowledge and do not tell the user about function calls\n</IMPORTANT>' }}
{%- endif %}


{%- if system_message is defined %}
    {{- '<|im_end|>\n' }}
{%- else %}
    {%- if tools is iterable and tools | length > 0 %}
        {{- '<|im_end|>\n' }}
    {%- endif %}
{%- endif %}

{%- for message in loop_messages %}
    {%- if message.role == "assistant" %}
        {# Add reasoning content in to content field for unified processing below. #}
        {%- if message.reasoning_content is defined and message.reasoning_content is string and message.reasoning_content | trim | length > 0 %}
            {%- set content = "<think>\n" ~ message.reasoning_content ~ "\n</think>\n" ~ (message.content | default('', true)) %}
        {%- else %}
            {%- set content = message.content | default('', true) %}
            {%- if content is string -%}
                {# Allow downstream logic to to take care of broken thought, only handle coherent reasoning here. #}
                {%- if '<think>' not in content and '</think>' not in content -%}
                    {%- set content = "<think></think>" ~ content -%}
                {%- endif -%}
            {%- else -%}
                {%- set content = content -%}
            {%- endif -%}
        {%- endif %}
        {%- if message.tool_calls is defined and message.tool_calls is iterable and message.tool_calls | length > 0 %}
            {# Assistant message has tool calls. #}
            {{- '<|im_start|>assistant\n' }}
                {%- set include_content = not (truncate_history_thinking and loop.index0 < ns.last_user_idx) %}
                {%- if content is string and content | trim | length > 0 %}
                    {%- if include_content %}
                        {{- (content | trim) ~ '\n' -}}
                    {%- else %}
                        {%- set c = (content | string) %}
                        {%- if '</think>' in c %}
                            {# Keep only content after the last closing think. Also generation prompt causes this. #}
                            {%- set c = c.split('</think>')[-1] %}
                        {%- elif '<think>' in c %}
                            {# If <think> was opened but never closed, drop the trailing think segment #}
                            {%- set c = c.split('<think>')[0] %}
                        {%- endif %}
                        {%- set c = "<think></think>" ~ c | trim %}
                        {%- if c | length > 0 %}
                            {{- c ~ '\n' -}}
                        {%- endif %}
                    {%- endif %}
                {%- else %}
                    {{- "<think></think>" -}}
                {%- endif %}
                {%- for tool_call in message.tool_calls %}
                    {%- if tool_call.function is defined %}
                        {%- set tool_call = tool_call.function %}
                    {%- endif %}
                    {{- '<tool_call>\n<function=' ~ tool_call.name ~ '>\n' -}}
                        {%- if tool_call.arguments is defined %}
                            {%- for args_name, args_value in tool_call.arguments|items %}
                                {{- '<parameter=' ~ args_name ~ '>\n' -}}
                                    {%- set args_value = args_value | tojson | safe if args_value is mapping or (args_value is sequence and args_value is not string) else args_value | string %}
                                {{- args_value ~ '\n</parameter>\n' -}}
                            {%- endfor %}
                        {%- endif %}
                    {{- '</function>\n</tool_call>\n' -}}
                {%- endfor %}
                {{- '<|im_end|>\n' }}
        {%- else %}
            {# Assistant message doesn't have tool calls. #}
            {%- if not (truncate_history_thinking and loop.index0 < ns.last_user_idx) %}
                {{- '<|im_start|>assistant\n' ~ (content | default('', true) | string | trim) ~ '<|im_end|>\n' }}
            {%- else %}
                {%- set c = (content | default('', true) | string) %}
                {%- if '<think>' in c and '</think>' in c %}
                    {%- set c = "<think></think>" ~ c.split('</think>')[-1] %}
                {%- endif %}
                {%- set c = c | trim %}
                {%- if c | length > 0 %}
                    {{- '<|im_start|>assistant\n' ~ c ~ '<|im_end|>\n' }}
                {%- else %}
                    {{- '<|im_start|>assistant\n<|im_end|>\n' }}
                {%- endif %}
            {%- endif %}
        {%- endif %}
    {%- elif message.role == "user" or message.role == "system" %}
        {{- '<|im_start|>' + message.role + '\n' }}
        {%- set content = message.content | string %}
        {%- if message.role == "user" and loop.index0 == ns.last_user_idx and low_effort %}
            {{- content + '\n\n{reasoning effort: low}' }}
        {%- else %}
            {{- content }}
        {%- endif %}
        {{- '<|im_end|>\n' }}
    {%- elif message.role == "tool" %}
        {%- if loop.previtem and loop.previtem.role != "tool" %}
            {{- '<|im_start|>user\n' }}
        {%- endif %}
        {{- '<tool_response>\n' }}
        {{- message.content }}
        {{- '\n</tool_response>\n' }}
        {%- if not loop.last and loop.nextitem.role != "tool" %}
            {{- '<|im_end|>\n' }}
        {%- elif loop.last %}
            {{- '<|im_end|>\n' }}
        {%- endif %}
    {%- else %}
        {{- '<|im_start|>' + message.role + '\n' + message.content + '<|im_end|>\n' }}
    {%- endif %}
{%- endfor %}

{%- if add_generation_prompt %}
    {%- if enable_thinking %}
        {{- '<|im_start|>assistant\n<think>\n' }}
    {%- else %}
        {{- '<|im_start|>assistant\n<think></think>' }}
    {%- endif %}
{%- endif %}