Support for structured output

chat_template.jinja

@@ -1,5 +1,5 @@
 [gMASK]<sop>
-{%- if tools -%}
+{%- if tools and not (structured_output is defined and structured_output.enabled) -%}
 <|system|>
 # Tools
 
@@ -78,7 +78,29 @@ For each function call, output the function name and arguments within the follow
 <tool_response>{{ tr.output if tr.output is defined else tr }}</tool_response>{% endfor -%}
 {% endif -%}
 {%- elif m.role == 'system' -%}
-<|system|>{{ visible_text(m.content) }}
+<|system|>
+{%- if structured_output is defined and structured_output.enabled and loop.index0 == 0 -%}
+# Structured Output
+
+You are a structured output engine.
+
+Output ONLY valid JSON. Follow the JSON schema exactly.
+
+Do not output:
+- markdown
+- prose
+- explanations
+- XML
+- comments
+- chain-of-thought
+
+JSON Schema:
+{{ structured_output.schema | tojson(indent=2) }}
+
+{{ visible_text(m.content) }}
+{%- else -%}
+{{ visible_text(m.content) }}
+{%- endif -%}
 {%- endif -%}
 {%- endfor -%}
 {%- if add_generation_prompt -%}