text_tokenizer/chat_template.jinja

{% macro render_extra_keys(json_dict, handled_keys) %}
    {%- if json_dict is mapping %}
        {%- for json_key in json_dict if json_key not in handled_keys %}
            {%- if json_dict[json_key] is mapping or (json_dict[json_key] is sequence and json_dict[json_key] is not string) %}
                {{- '
<' ~ json_key ~ '>' ~ (json_dict[json_key] | tojson | safe) ~ '</' ~ json_key ~ '>' }}
            {%- else %}
                {{-'
<' ~ json_key ~ '>' ~ (json_dict[json_key] | string) ~ '</' ~ json_key ~ '>' }}
            {%- endif %}
        {%- endfor %}
    {%- endif %}
{% endmacro %}
{%- set enable_thinking = enable_thinking if enable_thinking is defined else True %}
{%- 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" %}
    {%- if messages[0]["content"] is string %}
        {%- set system_message = messages[0]["content"] %}
    {%- else %}
        {%- set ns = namespace(system_text="") %}
        {%- for part in messages[0]["content"] %}
            {%- if 'text' in part %}
                {%- set ns.system_text = ns.system_text + part.text %}
            {%- endif %}
        {%- endfor %}
        {%- set system_message = ns.system_text %}
    {%- endif %}

    {%- 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
" + system_message }}
{%- else %}
    {%- if tools is iterable and tools | length > 0 %}
        {{- "<|im_start|>system
" }}
    {%- endif %}
{%- endif %}
{%- if tools is iterable and tools | length > 0 %}
    {%- if system_message is defined and system_message | length > 0 %}
        {{- "

" }}
    {%- endif %}
    {{- "# Tools

You have access to the following functions:

" }}
    {{- "<tools>" }}
    {%- for tool in tools %}
        {%- if tool.function is defined %}
            {%- set tool = tool.function %}
        {%- endif %}
        {{- "
<function>
<name>" ~ tool.name ~ "</name>" }}
        {%- if tool.description is defined %}
            {{- '
<description>' ~ (tool.description | trim) ~ '</description>' }}
        {%- endif %}
        {{- '
<parameters>' }}
        {%- if tool.parameters is defined and tool.parameters is mapping and tool.parameters.properties is defined and tool.parameters.properties is mapping %}
            {%- for param_name, param_fields in tool.parameters.properties|items %}
                {{- '
<parameter>' }}
                {{- '
<name>' ~ param_name ~ '</name>' }}
                {%- if param_fields.type is defined %}
                    {{- '
<type>' ~ (param_fields.type | string) ~ '</type>' }}
                {%- endif %}
                {%- if param_fields.description is defined %}
                    {{- '
<description>' ~ (param_fields.description | trim) ~ '</description>' }}
                {%- endif %}
                {%- if param_fields.enum is defined %}
                    {{- '
<enum>' ~ (param_fields.enum | tojson | safe) ~ '</enum>' }}
                {%- endif %}
                {%- set handled_keys = ['name', 'type', 'description', 'enum'] %}
                {{- render_extra_keys(param_fields, handled_keys) }}
                {{- '
</parameter>' }}
            {%- endfor %}
        {%- endif %}
        {% set handled_keys = ['type', 'properties', 'required'] %}
        {{- render_extra_keys(tool.parameters, handled_keys) }}
        {%- if tool.parameters is defined and tool.parameters.required is defined %}
            {{- '
<required>' ~ (tool.parameters.required | tojson | safe) ~ '</required>' }}
        {%- endif %}
        {{- '
</parameters>' }}
        {%- set handled_keys = ['type', 'name', 'description', 'parameters'] %}
        {{- render_extra_keys(tool, handled_keys) }}
        {{- '
</function>' }}
    {%- endfor %}
    {{- "
</tools>" }}

    {{- '

If you choose to call a function ONLY reply in the following format with NO suffix:

<tool_call>
<function=example_function_name>
<parameter=example_parameter_1>
value_1
</parameter>
<parameter=example_parameter_2>
This is the value for the second parameter
that can span
multiple lines
</parameter>
</function>
</tool_call>

<IMPORTANT>
Reminder:
- Function calls MUST follow the specified format: an inner <function=...></function> block must be nested within <tool_call></tool_call> XML tags
- Required parameters MUST be specified
- You may provide optional reasoning for your function call in natural language BEFORE the function call, but NOT after
- 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
</IMPORTANT>' }}
{%- endif %}


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

{%- set image_count = namespace(value=0) %}
{%- set video_count = namespace(value=0) %}
{%- for message in loop_messages %}
    {%- if message.role == "assistant" %}
        {# Add reasoning content in to content field for unified processing below. #}
        {%- set text_content = namespace(text_content="") -%}
        {%- if message.content is string %}
            {%- set text_content.text_content = message.content %}
        {%- else %}
            {%- for content in message.content %}
                {%- if 'text' in content %}
                    {%- set text_content.text_content = content.text %}
                    {%- break %}
                {%- endif %}
            {%- endfor %}
        {%- endif %}
        {%- if message.reasoning_content is defined and message.reasoning_content is string and message.reasoning_content | trim | length > 0 %}
            {%- set content = "<think>
" ~ message.reasoning_content ~ "
</think>
" ~ (text_content.text_content | default('', true)) %}
        {%- else %}
            {%- set content = text_content.text_content | default('', true) %}
            {# 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 %}
            {%- 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
' }}
                {%- 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) ~ '
' -}}
                    {%- 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 ~ '
' -}}
                        {%- 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>
<function=' ~ tool_call.name ~ '>
' -}}
                        {%- if tool_call.arguments is defined %}
                            {%- for args_name, args_value in tool_call.arguments|items %}
                                {{- '<parameter=' ~ args_name ~ '>
' -}}
                                    {%- 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 ~ '
</parameter>
' -}}
                            {%- endfor %}
                        {%- endif %}
                    {{- '</function>
</tool_call>
' -}}
                {%- endfor %}
                {{- '<|im_end|>
' }}
        {%- else %}
            {# Assistant message doesn't have tool calls. #}
            {%- if not (truncate_history_thinking and loop.index0 < ns.last_user_idx) %}
                {{- '<|im_start|>assistant
' ~ (content | default('', true) | string | trim) ~ '<|im_end|>
' }}
            {%- 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
' ~ c ~ '<|im_end|>
' }}
                {%- else %}
                    {{- '<|im_start|>assistant
<|im_end|>
' }}
                {%- endif %}
            {%- endif %}
        {%- endif %}
    {%- elif message.role == "user" or message.role == "system" %}
        {{- '<|im_start|>' + message.role + '
' }}
        {%- if message.content is string %}
            {{- message.content }}
        {%- else %}
            {%- for content in message.content %}
                {%- if content.type == 'image' or 'image' in content or 'image_url' in content %}
                    {%- set image_count.value = image_count.value + 1 %}
                    {%- if add_vision_id %}Picture {{ image_count.value }}: {% endif -%}
                    <|vision_start|><|image_pad|><|vision_end|>
                {%- elif content.type == 'video' or 'video' in content %}
                    {%- set video_count.value = video_count.value + 1 %}
                    {%- if add_vision_id %}Video {{ video_count.value }}: {% endif -%}
                    <|vision_start|><|video_pad|><|vision_end|>
                {%- elif 'text' in content %}
                    {{- content.text }}
                {%- endif %}
            {%- endfor %}
        {%- endif %}
        {{- '<|im_end|>
' }}
    {%- elif message.role == "tool" %}
        {%- if loop.previtem and loop.previtem.role != "tool" %}
            {{- '<|im_start|>user
' }}
        {%- endif %}
        {{- '<tool_response>
' }}
        {{- message.content }}
        {{- '
</tool_response>
' }}
        {%- if not loop.last and loop.nextitem.role != "tool" %}
            {{- '<|im_end|>
' }}
        {%- elif loop.last %}
            {{- '<|im_end|>
' }}
        {%- endif %}
    {%- else %}
        {{- '<|im_start|>' + message.role + '
' + message.content + '<|im_end|>
' }}
    {%- endif %}
{%- endfor %}

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