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) 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)default
escape_formatr
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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
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/ o r c t )N)NotImplementedErrorr( s r get_format_instructionsz,XMLAgentOutputParser.get_format_instructionsv s !!r c y)Nz xml-agent r3 s r _typezXMLAgentOutputParser._typey s r N)__name__
__module__ __qualname____doc__r r r r __annotations__strr r r r0 r4 propertyr7 r6 r r r r sm B 38 2JM8GI ./J0 # 0 % [(@"A 0 d" " s r r )r# typingr r r langchain_core.agentsr r pydanticr langchain.agentsr r= r r r6 r r rC s9 + + : . C C b, br