QWEN3.5.MOD

{%- set image_count = namespace(value=0) %}
{%- set video_count = namespace(value=0) %}

{%- macro render_content(content, do_vision_count, is_system_content=false) %}
    {%- if content is string %}
        {{- content }}
    {%- elif content is iterable and content is not mapping %}
        {%- for item in content %}
            {%- if 'image' in item or 'image_url' in item or item.type == 'image' %}
                {%- if is_system_content %}
                    {{- raise_exception('System message cannot contain images.') }}
                {%- endif %}
                {%- if do_vision_count %}
                    {%- set image_count.value = image_count.value + 1 %}
                {%- endif %}
                {{- '<|vision_start|><|image_pad|><|vision_end|>' }}
            {%- elif 'video' in item or item.type == 'video' %}
                {%- if is_system_content %}
                    {{- raise_exception('System message cannot contain videos.') }}
                {%- endif %}
                {%- if do_vision_count %}
                    {%- set video_count.value = video_count.value + 1 %}
                {%- endif %}
                {{- '<|vision_start|><|video_pad|><|vision_end|>' }}
            {%- elif 'text' in item %}
                {{- item.text }}
            {%- else %}
                {{- raise_exception('Unexpected item type in content.') }}
            {%- endif %}
        {%- endfor %}
    {%- elif content is none or content is undefined %}
        {{- '' }}
    {%- else %}
        {{- raise_exception('Unexpected content type.') }}
    {%- endif %}
{%- endmacro %}

{%- if not messages %}
    {{- raise_exception('No messages provided.') }}
{%- endif %}

{# ========================================= #}
{# Detect /think ONLY in FIRST system msg   #}
{# ========================================= #}
{%- set ns_enable = namespace(enable_thinking=false) %}
{%- if messages[0].role == 'system' %}
    {%- set sys_raw = render_content(messages[0].content, false, true)|trim %}
    {%- if '/think' in sys_raw %}
        {%- set ns_enable.enable_thinking = true %}
    {%- endif %}
{%- endif %}

{%- if tools and tools is iterable and tools is not mapping %}
    {{- '<|im_start|>system\n' }}
    {{- "# Tools\n\nYou have access to the following functions:\n\n<tools>" }}
    {%- for tool in tools %}
        {{- "\n" }}
        {{- tool | tojson }}
    {%- endfor %}
    {{- "\n</tools>" }}

    {%- if messages[0].role == 'system' %}
        {%- set content = render_content(messages[0].content, false, true)|trim %}
        {%- set content = content.replace('/think','')|trim %}
        {%- if content %}
            {{- '\n\n' + content }}
        {%- endif %}
    {%- endif %}

    {{- '<|im_end|>\n' }}

{%- else %}

    {%- if messages[0].role == 'system' %}
        {%- set content = render_content(messages[0].content, false, true)|trim %}
        {%- set content = content.replace('/think','')|trim %}
        {{- '<|im_start|>system\n' + content + '<|im_end|>\n' }}
    {%- endif %}

{%- endif %}

{%- set ns = namespace(multi_step_tool=true, last_query_index=messages|length - 1) %}
{%- for message in messages[::-1] %}
    {%- set index = (messages|length - 1) - loop.index0 %}
    {%- if ns.multi_step_tool and message.role == "user" %}
        {%- set content = render_content(message.content, false)|trim %}
        {%- if not(content.startswith('<tool_response>') and content.endswith('</tool_response>')) %}
            {%- set ns.multi_step_tool = false %}
            {%- set ns.last_query_index = index %}
        {%- endif %}
    {%- endif %}
{%- endfor %}

{%- if ns.multi_step_tool %}
    {{- raise_exception('No user query found in messages.') }}
{%- endif %}

{%- for message in messages %}
    {%- set content = render_content(message.content, true)|trim %}

    {%- if message.role == "system" %}
        {%- if not loop.first %}
            {{- raise_exception('System message must be at the beginning.') }}
        {%- endif %}

    {%- elif message.role == "user" %}
        {{- '<|im_start|>user\n' + content + '<|im_end|>\n' }}

    {%- elif message.role == "assistant" %}

        {{- '<|im_start|>assistant\n' }}

        {%- if ns_enable.enable_thinking and loop.index0 > ns.last_query_index %}
            {%- if message.reasoning_content %}
                {{- '<think>\n' + message.reasoning_content|trim + '\n</think>\n\n' }}
            {%- endif %}
        {%- endif %}

        {{- content }}

        {{- '<|im_end|>\n' }}

    {%- elif message.role == "tool" %}

        {{- '<|im_start|>user\n<tool_response>\n' }}
        {{- content }}
        {{- '\n</tool_response><|im_end|>\n' }}

    {%- else %}
        {{- raise_exception('Unexpected message role.') }}
    {%- endif %}
{%- endfor %}

{# ========================================= #}
{# Final generation prompt control          #}
{# ========================================= #}

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