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d e Zy) N)Literal) AgentAction AgentFinish)Field)override)AgentOutputParsertextreturnc l ddddddd}|j D ] \ }}| j || } | S )z1Convert custom tag delimiters back into XML tags.zzz z
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Zy) XMLAgentOutputParsera Parses tool invocations and final answers from XML-formatted agent output.
This parser extracts structured information from XML tags to determine whether
an agent should perform a tool action or provide a final answer. It includes
built-in escaping support to safely handle tool names and inputs
containing XML special characters.
Args:
escape_format: The escaping format to use when parsing XML content.
Supports 'minimal' which uses custom delimiters like [[tool]] to replace
XML tags within content, preventing parsing conflicts.
Use 'minimal' if using a corresponding encoding format that uses
the _escape function when formatting the output (e.g., with format_xml).
Expected formats:
Tool invocation (returns AgentAction):
search
what is 2 + 2
Final answer (returns AgentFinish):
The answer is 4
!!! note
Minimal escaping allows tool names containing XML tags to be safely represented.
For example, a tool named `searchnested` would be escaped as
`search[[tool]]nested[[/tool]]` in the XML and automatically unescaped during
parsing.
Raises:
ValueError: If the input doesn't match either expected XML format or
contains malformed XML structure.
minimal)defaultN
escape_formatr r
c t j d|t j }|rt | dk7 rdt | d}t | |d }t j d|t j }t | dkD rdt | d}t | |r|d nd}| j
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| }t d|i| S d}t | )Nz(.*?) zHMalformed tool invocation: expected exactly one block, but found .r z (.*?)zNMalformed tool invocation: expected at most one block, but found r )tool
tool_inputlogzzz"(.*?)zNMalformed output: expected exactly one ... block.output)
return_valuesr zTMalformed output: expected either a tool invocation or a final answer in XML format.) refindallDOTALLlen
ValueErrorr r r r ) selfr tool_matchesmsg_tool
input_matches _tool_inputmatchesanswers r parsezXMLAgentOutputParser.parseE s zz"7ryyI < A%!!$\!2 316 !o% OE JJ14 M =!A%((+M(:';1> !o%.;-*K !!Y.!%( ' 4 EktL L t #(9T(Ajj!FbiiXG7|q > !o% QZF!!Y."6* h-?TJ J
/ o r c t )N)NotImplementedErrorr' s r get_format_instructionsz,XMLAgentOutputParser.get_format_instructionsx s !!r c y)Nz xml-agent r2 s r _typezXMLAgentOutputParser._type| s r )__name__
__module__ __qualname____doc__r r r __annotations__r strr r r/ r3 propertyr6 r5 r r r r s B 05Y/GM79%,G 0 # 0 + "; 0 0 d " " " s r r )r" typingr langchain_core.agentsr r pydanticr typing_extensionsr langchain_classic.agentsr r< r r r5 r r rC s9 : & 6 C C d, dr