{#
Modified Qwen 3.5 media-history chat template.

Upstream: Qwen/Qwen3.5-27B chat_template.jinja
Revision: feea018b31f89dc0950e61da42577a7a4ab09169
Source: https://huggingface.co/Qwen/Qwen3.5-27B/blob/feea018b31f89dc0950e61da42577a7a4ab09169/chat_template.jinja
License: Apache License 2.0. See LICENSE-APACHE-2.0.txt and NOTICE.md.

Modifications: adds media-history policy that removes textual image tool
exchanges and assistant-side media byte copies, retains only the latest explicit
audio and video tool results, and preserves native structured image and video
parts. The policy uses structural and marker checks with a 4,096-character
detection threshold. Jinja does not validate base64 data.
#}
{%- set image_count = namespace(value=0) %}
{%- set video_count = namespace(value=0) %}
{%- macro render_content(content, do_vision_count, is_system_content=false, message_index=-1) %}
    {%- 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 %}
                {%- if add_vision_id %}
                    {{- 'Picture ' ~ image_count.value ~ ': ' }}
                {%- 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 %}
                {%- if add_vision_id %}
                    {{- 'Video ' ~ video_count.value ~ ': ' }}
                {%- 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 %}
{%- set media_state = namespace(last_audio_message_index=-1, last_video_message_index=-1) %}
{%- for message in messages %}
    {%- if message.role == 'tool' and message.content is string and message.content|length > 4096 %}
        {%- if ('audio' in message.content or 'audios' in message.content) and 'data:audio/' in message.content %}
            {%- set media_state.last_audio_message_index = loop.index0 %}
        {%- endif %}
        {%- if ('video' in message.content or 'videos' in message.content) and 'data:video/' in message.content %}
            {%- set media_state.last_video_message_index = loop.index0 %}
        {%- endif %}
    {%- endif %}
{%- endfor %}
{%- set skip_state = namespace(indices=[]) %}
{%- for message in messages %}
    {%- set message_index = loop.index0 %}
    {%- set content_state = namespace(has_media=false, keep_media=false) %}
    {%- if message.role == 'tool' and message.content is string and message.content|length > 4096 %}
        {%- if 'images' in message.content and ('iVBORw0KGgo' in message.content or '/9j/' in message.content or 'data:image/' in message.content) %}
            {%- set content_state.has_media = true %}
        {%- endif %}
        {%- if ('audio' in message.content or 'audios' in message.content) and 'data:audio/' in message.content %}
            {%- set content_state.has_media = true %}
            {%- if message_index == media_state.last_audio_message_index %}{%- set content_state.keep_media = true %}{%- endif %}
        {%- endif %}
        {%- if ('video' in message.content or 'videos' in message.content) and 'data:video/' in message.content %}
            {%- set content_state.has_media = true %}
            {%- if message_index == media_state.last_video_message_index %}{%- set content_state.keep_media = true %}{%- endif %}
        {%- endif %}
    {%- endif %}
    {%- if content_state.has_media and not content_state.keep_media %}
        {%- set _ = skip_state.indices.append(message_index) %}
        {%- if message_index > 0 and messages[message_index - 1].role == 'assistant' %}
            {%- set _ = skip_state.indices.append(message_index - 1) %}
        {%- endif %}
    {%- endif %}
    {%- if message.role == 'assistant' and message.tool_calls and message.tool_calls is iterable and message.tool_calls is not mapping %}
        {%- set tool_state = namespace(has_media=false) %}
        {%- for original_tool_call in message.tool_calls %}
            {%- set tool_call = original_tool_call.function if original_tool_call.function is defined else original_tool_call %}
            {%- if tool_call.arguments is string %}
                {%- if 'data:image/' in tool_call.arguments or 'iVBORw0KGgo' in tool_call.arguments or '/9j/' in tool_call.arguments or 'data:audio/' in tool_call.arguments or 'data:video/' in tool_call.arguments or 'base64.b64decode' in tool_call.arguments or 'base64 --decode' in tool_call.arguments or 'base64 -d' in tool_call.arguments %}
                    {%- set tool_state.has_media = true %}
                {%- endif %}
            {%- elif tool_call.arguments is mapping %}
                {%- for args_name, args_value in tool_call.arguments|items %}
                    {%- set args_text = args_value | tojson | safe if args_value is mapping or (args_value is sequence and args_value is not string) else args_value | string %}
                    {%- if 'data:image/' in args_text or 'iVBORw0KGgo' in args_text or '/9j/' in args_text or 'data:audio/' in args_text or 'data:video/' in args_text or 'base64.b64decode' in args_text or 'base64 --decode' in args_text or 'base64 -d' in args_text %}
                        {%- set tool_state.has_media = true %}
                    {%- endif %}
                {%- endfor %}
            {%- endif %}
        {%- endfor %}
        {%- if tool_state.has_media %}
            {%- set _ = skip_state.indices.append(message_index) %}
        {%- endif %}
    {%- endif %}
{%- endfor %}
{%- set following_state = namespace(skip_tools=false) %}
{%- for message in messages %}
    {%- if message.role == 'assistant' %}
        {%- set following_state.skip_tools = loop.index0 in skip_state.indices %}
    {%- elif message.role == 'tool' and following_state.skip_tools %}
        {%- set _ = skip_state.indices.append(loop.index0) %}
    {%- else %}
        {%- set following_state.skip_tools = false %}
    {%- endif %}
{%- endfor %}
{%- 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>" }}
    {{- '\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>' }}
    {%- if messages[0].role == 'system' %}
        {%- set content = render_content(messages[0].content, false, true)|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 %}
        {{- '<|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, false, index)|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 %}
    {%- if loop.index0 not in skip_state.indices %}
        {%- set content = render_content(message.content, true, false, loop.index0)|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|>' + message.role + '\n' + content + '<|im_end|>' + '\n' }}
        {%- elif message.role == "assistant" %}
        {%- set reasoning_content = '' %}
        {%- if message.reasoning_content is string %}
            {%- set reasoning_content = message.reasoning_content %}
        {%- else %}
            {%- if '</think>' in content %}
                {%- set reasoning_content = content.split('</think>')[0].rstrip('\n').split('<think>')[-1].lstrip('\n') %}
                {%- set content = content.split('</think>')[-1].lstrip('\n') %}
            {%- endif %}
        {%- endif %}
        {%- set reasoning_content = reasoning_content|trim %}
        {%- if loop.index0 > ns.last_query_index %}
            {{- '<|im_start|>' + message.role + '\n<think>\n' + reasoning_content + '\n</think>\n\n' + content }}
        {%- else %}
            {{- '<|im_start|>' + message.role + '\n' + content }}
        {%- endif %}
        {%- if message.tool_calls and message.tool_calls is iterable and message.tool_calls is not mapping %}
            {%- for tool_call in message.tool_calls %}
                {%- if tool_call.function is defined %}
                    {%- set tool_call = tool_call.function %}
                {%- endif %}
                {%- if loop.first %}
                    {%- if content|trim %}
                        {{- '\n\n<tool_call>\n<function=' + tool_call.name + '>\n' }}
                    {%- else %}
                        {{- '<tool_call>\n<function=' + tool_call.name + '>\n' }}
                    {%- endif %}
                {%- else %}
                    {{- '\n<tool_call>\n<function=' + tool_call.name + '>\n' }}
                {%- endif %}
                {%- 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 %}
                        {%- if args_value|length > 4096 and ('data:image/' in args_value or 'iVBORw0KGgo' in args_value or '/9j/' in args_value or 'data:audio/' in args_value or 'data:video/' in args_value) %}
                            {{- '[Embedded media payload omitted from tool call]' }}
                        {%- else %}
                            {{- args_value }}
                        {%- endif %}
                        {{- '\n</parameter>\n' }}
                    {%- endfor %}
                {%- endif %}
                {{- '</function>\n</tool_call>' }}
            {%- endfor %}
        {%- endif %}
        {{- '<|im_end|>\n' }}
        {%- elif message.role == "tool" %}
        {%- if loop.previtem and loop.previtem.role != "tool" %}
            {{- '<|im_start|>user' }}
        {%- endif %}
        {{- '\n<tool_response>\n' }}
        {{- content }}
        {{- '\n</tool_response>' }}
        {%- if not loop.last and loop.nextitem.role != "tool" %}
            {{- '<|im_end|>\n' }}
        {%- elif loop.last %}
            {{- '<|im_end|>\n' }}
        {%- endif %}
        {%- else %}
        {{- raise_exception('Unexpected message role.') }}
        {%- endif %}
    {%- endif %}
{%- endfor %}
{%- if add_generation_prompt %}
    {{- '<|im_start|>assistant\n' }}
    {%- if enable_thinking is defined and enable_thinking is false %}
        {{- '<think>\n\n</think>\n\n' }}
    {%- else %}
        {{- '<think>\n' }}
    {%- endif %}
{%- endif %}