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{%- set preserve_thinking = preserve_thinking | default(false) -%}
{%- set enable_thinking = enable_thinking | default(false) -%}
{%- macro render_value(v) -%}
{%- if v is string -%}
{{- v -}}
{%- elif v is boolean -%}
{{- "true" if v else "false" -}}
{%- elif v is none -%}
{{- "null" -}}
{%- elif v is mapping or (v is sequence and v is not string) -%}
{{- v | tojson -}}
{%- else -%}
{{- v -}}
{%- endif -%}
{%- endmacro -%}
{%- macro parse_content(content) -%}
{%- if content is string -%}
{{- content -}}
{%- elif content is mapping and content.get("type") == "image" -%}
{{- "<|vision_start|><|image|><|vision_end|>" -}}
{%- elif content is mapping and content.get("type") == "video" -%}
{{- "<|vision_start|><|video|><|vision_end|>" -}}
{%- elif content is mapping and content.get("type") in ["audio", "audio_url", "input_audio"] -%}
{{- "<|vision_start|><|audio|><|vision_end|>" -}}
{%- elif content is mapping and content.get("type") == "audio_out" -%}
{{- "<|audio_out|>" -}}
{%- elif content is mapping and content.get("type") == "text" -%}
{{- (content.get("text") or "") | string -}}
{%- elif content is mapping -%}
{{- content | tojson -}}
{%- elif content is iterable -%}
{%- set _ns = namespace(result="") -%}
{%- for item in content -%}
{%- if item is string -%}
{%- set _ns.result = _ns.result + item -%}
{%- elif item is mapping and item.get("type") == "image" -%}
{%- set _ns.result = _ns.result + "<|vision_start|><|image|><|vision_end|>" -%}
{%- elif item is mapping and item.get("type") == "video" -%}
{%- set _ns.result = _ns.result + "<|vision_start|><|video|><|vision_end|>" -%}
{%- elif item is mapping and item.get("type") in ["audio", "audio_url", "input_audio"] -%}
{%- set _ns.result = _ns.result + "<|vision_start|><|audio|><|vision_end|>" -%}
{%- elif item is mapping and item.get("type") == "audio_out" -%}
{%- set _ns.result = _ns.result + "<|audio_out|>" -%}
{%- elif item is mapping and item.get("type") == "text" -%}
{%- set _ns.result = _ns.result + ((item.get("text") or "") | string) -%}
{%- else -%}
{%- set _ns.result = _ns.result + (item | tojson) -%}
{%- endif -%}
{%- endfor -%}
{{- _ns.result -}}
{%- endif -%}
{%- endmacro -%}
{%- macro render_tool_calls(tool_calls) -%}
{%- for tool_call in tool_calls -%}
{%- if not loop.first -%}{{- "\n\n" -}}{%- endif -%}
{%- set func = tool_call["function"] if "function" in tool_call else tool_call -%}
{%- set func_args = func.get("arguments") -%}
{%- if func_args is string and (func_args | trim) not in ["", "{}", "null"] -%}
{{- raise_exception("Tool call arguments must be a mapping, got a JSON-encoded string: parse arguments with json.loads() before applying the chat template") -}}
{%- endif -%}
{{- "<tool_call>\n<function=" + func["name"] + ">\n" -}}
{%- if func_args is mapping -%}
{%- for arg_name, arg_value in func_args.items() -%}
{{- "<parameter=" + arg_name + ">\n" + render_value(arg_value) + "\n</parameter>\n" -}}
{%- endfor -%}
{%- endif -%}
{{- "</function>\n</tool_call>" -}}
{%- endfor -%}
{%- endmacro -%}
{%- macro tool_to_json(tool) -%}
{%- set fn = tool.function if tool.function is defined else tool -%}
{%- set ns_t = namespace(first=true) -%}
{{- "{" -}}
{%- for k, v in fn.items() -%}
{%- if k != "defer_loading" -%}
{%- if not ns_t.first -%}{{- ", " -}}{%- endif -%}
{%- set ns_t.first = false -%}
{{- k | tojson -}}{{- ": " -}}{{- v | tojson -}}
{%- endif -%}
{%- endfor -%}
{{- "}" -}}
{%- endmacro -%}
{#- a tool_reference content part (vLLM, SGLang) names a tool from `tools`,
usually a deferred one; it renders as that tool's definition -#}
{%- macro is_tool_reference(item) -%}
{{- "1" if item is mapping and item.get("type") == "tool_reference" else "" -}}
{%- endmacro -%}
{%- macro referenced_tool_to_json(name) -%}
{%- set _ns = namespace(found=none) -%}
{%- for tool in tools or [] -%}
{%- set fn = tool.function if tool.function is defined else tool -%}
{%- if fn.name == name -%}
{%- set _ns.found = fn -%}
{%- endif -%}
{%- endfor -%}
{%- if _ns.found is none -%}
{{- raise_exception("tool_reference names a tool that is not in tools: " + name | string) -}}
{%- endif -%}
{{- tool_to_json(_ns.found) -}}
{%- endmacro -%}
{%- macro render_tool_response(content) -%}
{#- content that already carries the tag (pre-formatted by the caller) is
passed through as-is instead of being wrapped a second time -#}
{%- if content is string and "<tool_response>" in content -%}
{{- content -}}
{%- else -%}
{{- "<tool_response>\n" -}}
{%- if content is string -%}
{{- content -}}
{%- elif content is mapping -%}
{{- parse_content(content) -}}
{%- elif content is iterable -%}
{%- for item in content -%}
{%- if not loop.first -%}{{- "\n" -}}{%- endif -%}
{%- if is_tool_reference(item) -%}
{#- consecutive references share one <additional_tools> block -#}
{%- if loop.first or not is_tool_reference(loop.previtem) -%}
{{- "<additional_tools>\n" -}}
{%- endif -%}
{{- referenced_tool_to_json(item.name) -}}
{%- if loop.last or not is_tool_reference(loop.nextitem) -%}
{{- "\n</additional_tools>" -}}
{%- endif -%}
{%- elif item is mapping and item.result is defined and item.result is mapping and item.result.tools is defined -%}
{{- "<additional_tools>\n" -}}
{%- set _tl = item.result.tools -%}
{%- if _tl is string -%}
{{- _tl -}}
{%- elif _tl is mapping -%}
{{- tool_to_json(_tl) -}}
{%- else -%}
{%- for t in _tl -%}
{%- if not loop.first -%}{{- "\n" -}}{%- endif -%}
{{- tool_to_json(t) -}}
{%- endfor -%}
{%- endif -%}
{{- "\n</additional_tools>" -}}
{%- else -%}
{{- parse_content(item) -}}
{%- endif -%}
{%- endfor -%}
{%- endif -%}
{{- "\n</tool_response>" -}}
{%- endif -%}
{%- endmacro -%}
{%- set ns = namespace(system_prompt="", last_user_index=-1) -%}
{%- if messages and messages[0]["role"] == "system" -%}
{%- if messages[0].get("content") -%}
{%- set ns.system_prompt = parse_content(messages[0]["content"]) -%}
{%- endif -%}
{%- set messages = messages[1:] -%}
{%- endif -%}
{%- if tools -%}
{%- set tools_ns = namespace(lines=[]) -%}
{%- for tool in tools -%}
{%- set fn = tool.function if tool.function is defined else tool -%}
{%- set _dyn = (fn.defer_loading is defined and fn.defer_loading) or (tool.defer_loading is defined and tool.defer_loading) -%}
{%- if not _dyn -%}
{%- set tools_ns.lines = tools_ns.lines + [tool_to_json(fn)] -%}
{%- endif -%}
{%- endfor -%}
{%- if tools_ns.lines -%}
{%- set ns.system_prompt = ns.system_prompt + ("\n\n" if ns.system_prompt else "") + "<tools>\n" + (tools_ns.lines | join("\n")) + "\n</tools>" -%}
{%- endif -%}
{%- endif -%}
{%- if ns.system_prompt -%}
{{- "<|im_start|>system\n" + ns.system_prompt + "<|im_end|>\n" -}}
{%- endif -%}
{%- for message in messages -%}
{%- if message["role"] == "user" -%}
{%- set ns.last_user_index = loop.index0 -%}
{%- endif -%}
{%- endfor -%}
{#- vLLM's and SGLang's Anthropic /v1/messages adapters split one tool_result that carries
tool_reference blocks into consecutive tool messages with the same tool_call_id (text first,
references second). Merge such runs into one tool turn so they render exactly like a single
OpenAI-format tool message whose content holds the same items. -#}
{%- set carry = namespace(items=[]) -%}
{%- for message in messages -%}
{%- set _next = messages[loop.index0 + 1] if not loop.last else none -%}
{%- set _merge = message.role == "tool" and not message.get("additional_tools")
and _next is not none and _next.role == "tool" and not _next.get("additional_tools")
and message.get("tool_call_id") and _next.get("tool_call_id") == message.get("tool_call_id") -%}
{%- set _items = [] -%}
{%- if message.role == "tool" and not message.get("additional_tools") -%}
{%- set _c = message.get("content") -%}
{%- if _c is string -%}
{%- set _items = [{"type": "text", "text": _c}] if _c else [] -%}
{%- elif _c is mapping -%}
{%- set _items = [_c] -%}
{%- elif _c -%}
{%- set _items = _c | list -%}
{%- endif -%}
{%- endif -%}
{%- if _merge -%}
{%- set carry.items = carry.items + _items -%}
{%- else -%}
{{- "<|im_start|>" + message.role + "\n" -}}
{%- if message.role == "assistant" -%}
{%- generation -%}
{%- set thinking = message.thinking if message.thinking is defined else message.reasoning if message.reasoning is defined else message.reasoning_content -%}
{%- set keep_thinking = preserve_thinking or loop.index0 > ns.last_user_index -%}
{%- if thinking is defined and keep_thinking -%}
{{- "<think>" + (thinking or "") + "</think>" -}}
{%- elif keep_thinking and "</think>" not in (message.get("content") if message.get("content") is string else "") -%}
{{- "<think></think>" -}}
{%- endif -%}
{%- set _cfm_tag = "CONTINUE_FINAL_MESSAGE_TAG " -%}
{%- set _has_cfm = false -%}
{%- set content = "" -%}
{%- if message.get("content") -%}
{%- set content = parse_content(message.content) -%}
{%- endif -%}
{%- if not keep_thinking -%}
{%- if "</think>" in content -%}
{%- set content = content.split("</think>")[-1] | trim -%}
{%- endif -%}
{%- set content = "<think></think>" + content -%}
{%- endif -%}
{%- if content.endswith(_cfm_tag) -%}
{%- set _has_cfm = true -%}
{%- set _trunc_len = (content | length) - (_cfm_tag | length) -%}
{%- set content = content[:_trunc_len] -%}
{%- endif -%}
{{- content -}}
{%- if message.tool_calls -%}
{{- render_tool_calls(message.tool_calls) -}}
{%- endif -%}
{%- if _has_cfm -%}
{{- _cfm_tag -}}
{%- endif -%}
{{- "<|im_end|>\n" -}}
{%- endgeneration -%}
{%- elif message.role == "tool" -%}
{%- if message.get("additional_tools") -%}
{%- set _at = message["additional_tools"] -%}
{#- definitions may live in additional_tools itself, or in content
with additional_tools used as a plain truthy flag -#}
{%- if _at is mapping or (_at is sequence and _at is not string) -%}
{%- set _src = _at -%}
{%- else -%}
{%- set _src = message.get("content") -%}
{%- endif -%}
{#- nothing to reveal: skip the wrapper entirely rather than
emitting an empty <additional_tools> block -#}
{%- if _src is string and "<tool_response>" in _src -%}
{{- _src -}}
{%- elif _src is string and "<additional_tools>" in _src -%}
{{- "<tool_response>\n" + _src + "\n</tool_response>" -}}
{%- elif _src -%}
{{- "<tool_response>\n<additional_tools>\n" -}}
{%- if _src is string -%}
{{- _src -}}
{%- elif _src is mapping -%}
{{- tool_to_json(_src) -}}
{%- else -%}
{%- for t in _src -%}
{%- if not loop.first -%}{{- "\n" -}}{%- endif -%}
{{- tool_to_json(t) -}}
{%- endfor -%}
{%- endif -%}
{{- "\n</additional_tools>\n</tool_response>" -}}
{%- endif -%}
{%- elif carry.items -%}
{{- render_tool_response(carry.items + _items) -}}
{%- set carry.items = [] -%}
{%- else -%}
{#- an empty or missing result still gets the wrapper, so every tool turn has the same shape -#}
{{- render_tool_response(message.get("content") or "") -}}
{%- endif -%}
{{- "<|im_end|>\n" -}}
{%- else %}
{%- if message.get("content") -%}
{{- parse_content(message["content"]) -}}
{%- endif -%}
{{- "<|im_end|>\n" -}}
{%- endif %}
{%- endif -%}
{%- endfor -%}
{%- if add_generation_prompt -%}
{{- "<|im_start|>assistant\n" -}}
{%- if enable_thinking -%}
{{- "<think>" -}}
{%- else -%}
{{- "<think></think>" -}}
{%- endif -%}
{%- endif -%}
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