{{ bos_token }}
{%- set first_is_system = (messages and messages[0]['role'] == 'system') -%}

{# ---------- SYSTEM TURN WITH TOOL INSTRUCTIONS (GEMMA STYLE) ---------- #}
{%- if first_is_system -%}
<start_of_turn>system
{%- if messages[0]['content'] is string -%}
{{ messages[0]['content'] | trim }}
{%- else -%}
{{ messages[0]['content'][0]['text'] | trim }}
{%- endif %}

You can call external tools ("functions") to get real-time data or to take actions.

TOOL CALL PROTOCOL:
1. When a tool is needed, respond with only one or more <tool_call>...</tool_call> blocks in that turn.
2. Each block must be valid JSON:
   {
     "id": "<unique_call_id>",
     "type": "function",
     "function": {
       "name": "<tool_name>",
       "arguments": { ... }
     }
   }
3. "arguments" must be valid JSON and match the schema.
4. After tool responses (<tool_response>...</tool_response>) arrive, continue the conversation using those results.
5. If no tool is needed, answer normally.

AVAILABLE TOOLS:
{%- if tools is defined and tools|length > 0 %}
{%- for t in tools %}
- {{ t["function"]["name"] }} : {{ t["function"]["description"] }}
  params: {{ t["function"]["parameters"] | tojson }}
{%- endfor %}
{%- else %}
(no tools provided)
{%- endif %}
<end_of_turn>
{%- set loop_messages = messages[1:] -%}
{%- else -%}
<start_of_turn>system
You are a helpful AI assistant.
You can call external tools ("functions") to get real-time data or to take actions.

TOOL CALL PROTOCOL:
1. When a tool is needed, respond with only one or more <tool_call>...</tool_call> blocks in that turn.
2. Each block must be valid JSON:
   {
     "id": "<unique_call_id>",
     "type": "function",
     "function": {
       "name": "<tool_name>",
       "arguments": { ... }
     }
   }
3. "arguments" must be valid JSON and match the schema.
4. After tool responses (<tool_response>...</tool_response>) arrive, continue the conversation using those results.
5. If no tool is needed, answer normally.

AVAILABLE TOOLS:
{%- if tools is defined and tools|length > 0 %}
{%- for t in tools %}
- {{ t["function"]["name"] }} : {{ t["function"]["description"] }}
  params: {{ t["function"]["parameters"] | tojson }}
{%- endfor %}
{%- else %}
(no tools provided)
{%- endif %}
<end_of_turn>
{%- set loop_messages = messages -%}
{%- endif %}

{# ---------- OTHER MESSAGES ---------- #}
{%- for message in loop_messages -%}
  {# assistant turn that issues tool calls #}
  {%- if message['role'] == 'assistant' and ('tool_calls' in message) and message['tool_calls'] %}
<start_of_turn>model
{%- for c in message['tool_calls'] %}
<tool_call>{{ {
  "id": c["id"],
  "type": c.get("type", "function"),
  "function": {
    "name": c["function"]["name"],
    "arguments": (
      c["function"]["arguments"]
      if c["function"]["arguments"] is not none
      else {}
    )
  }
} | tojson }}</tool_call>
{%- endfor %}
<end_of_turn>
  {# tool result turn (fed back to model as user) #}
  {%- elif message['role'] == 'tool' %}
<start_of_turn>user
<tool_response{% if message.get('tool_call_id') %} id="{{ message['tool_call_id'] }}"{% endif %}>
{{ message['content'] }}
</tool_response>
<end_of_turn>
  {# normal user/model turns #}
  {%- else -%}
    {%- if message['role'] == 'assistant' -%}
      {%- set role = "model" -%}
    {%- else -%}
      {%- set role = message['role'] -%}
    {%- endif -%}
<start_of_turn>{{ role }}
    {%- if message['content'] is string -%}
{{ message['content'] | trim }}
    {%- elif message['content'] is iterable -%}
      {%- for item in message['content'] -%}
        {%- if item['type'] == 'image' -%}
<start_of_image>
        {%- elif item['type'] == 'text' -%}
{{ item['text'] | trim }}
        {%- endif -%}
      {%- endfor -%}
    {%- endif -%}
<end_of_turn>
  {%- endif -%}
{%- endfor -%}

{# ---------- GENERATION PROMPT ---------- #}
{%- if add_generation_prompt -%}
<start_of_turn>model
{%- endif -%}