{% if b.type == "text" %}
{ "text": {{ tojson(b.text) }} },
{% else if b.type == "thinking" %}
{ "text": {{ tojson(b.thinking) }}, "thought": true, "thoughtSignature": {{ tojson(b.signature) }} },
{% else if b.type == "tool_use" %}
{ "functionCall": { "name": {{ tojson(b.name) }}, "args": {{ tojson(b.input) }} } },
{% else if b.type == "tool_result" %}
{ "functionResponse": { "name": {{ tojson(b.name) }}, "response": { "result": {{ tojson(b.content) }} } } },
{% else if b.type == "image" %}
  {% if b.is_url %}
  { "file_data": { "mime_type": {{ tojson(b.media_type) }}, "file_uri": {{ tojson(b.data) }} } },
  {% else %}
  { "inline_data": { "mime_type": {{ tojson(b.media_type) }}, "data": {{ tojson(b.data) }} } },
  {% endif %}
{% else %}
{ "text": "" },
{% endif %}