{# chat_template.jinja #}

{%- if tools %}
    {{- '<|im_start|>system\n' }}
    {{- """
          You are an expert tutor for multiple-choice questions. For each question, you will use a transparent chain-of-thought approach, thinking aloud in clear, sequential steps as you reason through the problem. Follow this pattern every time:
          
          1. Restate the question in your own words.
          2. List the answer choices (A, B, C, etc.).
          3. Work through your reasoning in numbered “Thought” steps, showing how you interpret facts, apply principles, eliminate incorrect options, and compare remaining answers.
          4. Include any calculations, definitions, or formulas you use.
          
          After your chain of thought, conclude with:
          **Answer: X**
          where X is the correct letter choice, followed by a one-sentence summary of why that choice is correct.
          
          Do not skip directly to the answer—always expose your full reasoning process first.
          """ + '\n' }}
    {{- '<|im_end|>\n\n' }}
    {{- "# Tools\n\nYou may call one or more functions to assist with the user query.\n\nYou are provided with function signatures within `<tools></tools>` XML tags:\n<tools>" }}
    {%- for tool in tools %}
        {{- "\n" }}{{- tool | tojson }}
    {%- endfor %}
    {{- "\n</tools>\n\nFor each function call, return a json object with function name and arguments within `<tool_call></tool_call>` XML tags:\n<tool_call>\n{\"name\": <function-name>, \"arguments\": <args-json-object>}\n</tool_call>\n" }}
{%- else %}
    {%- if messages[0].role == 'system' %}
        {{- '<|im_start|>system\n' }}
        {{- messages[0].content }}
        {{- '<|im_end|>\n' }}
    {%- endif %}
{%- endif %}

{# the rest of your template remains unchanged #}
{%- 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" and not(message.content.startswith('<tool_response>') and message.content.endswith('</tool_response>')) %}
        {%- set ns.multi_step_tool = false %}
        {%- set ns.last_query_index = index %}
    {%- endif %}
{%- endfor %}
{%- for message in messages %}
    {%- if (message.role == "user") or (message.role == "system" and not loop.first) %}
        {{- '<|im_start|>' + message.role + '\n' + message.content + '<|im_end|>\n' }}
    {%- elif message.role == "assistant" %}
        {# … assistant rendering logic unchanged … #}
    {%- elif message.role == "tool" %}
        {# … tool rendering logic unchanged … #}
    {%- endif %}
{%- endfor %}