k i#:dZddlmZmZddlmZmZddlmZm Z m Z m Z ddl m Z ddlmZddlmZmZddlmZdd lmZdd lmZdd lmZmZdd lmZdd lmZddlm Z de!de de"ee"ezde#fdZ$e deGddeZ%dS)aThis module provides a ValidationNode class that can be used to validate tool calls in a langchain graph. It applies a pydantic schema to tool_calls in the models' outputs, and returns a ToolMessage with the validated content. If the schema is not valid, it returns a ToolMessage with the error message. The ValidationNode can be used in a StateGraph with a "messages" key. If multiple tool calls are requested, they will be run in parallel. )CallableSequence)Anycast) AIMessage AnyMessageToolCall ToolMessage)RunnableConfig)get_executor_for_config)BaseToolcreate_schema_from_function)is_basemodel_subclass)RunnableCallable)LangGraphDeprecatedSinceV10) BaseModelValidationError)r)r) deprecatederrorcallschemareturnc&t|dS)z"Default error formatting function.z- Respond after fixing all validation errors.)repr)rrrs C:\Users\Dell Inspiron 16\Desktop\tws\AgrotaPowerBi\back-agrota-powerbi\mcp-client-agrota\venv\Lib\site-packages\langgraph/prebuilt/tool_validator.py_default_format_errorr"s 5kk J J JJzpValidationNode is deprecated. Please use `create_agent` from `langchain.agents` with custom tool error handling.)categoryc eZdZdZdddddeeeezezdee e eege fdzde de e dzd df fd Z d e eee efzd ee effd Zd e eee efzd ed efdZxZS)ValidationNodea A node that validates all tools requests from the last `AIMessage`. It can be used either in `StateGraph` with a `'messages'` key. !!! note This node does not actually **run** the tools, it only validates the tool calls, which is useful for extraction and other use cases where you need to generate structured output that conforms to a complex schema without losing the original messages and tool IDs (for use in multi-turn conversations). Returns: (Union[Dict[str, List[ToolMessage]], Sequence[ToolMessage]]): A list of `ToolMessage` objects with the validated content or error messages. Example: ```python title="Example usage for re-prompting the model to generate a valid response:" from typing import Literal, Annotated from typing_extensions import TypedDict from langchain_anthropic import ChatAnthropic from pydantic import BaseModel, field_validator from langgraph.graph import END, START, StateGraph from langgraph.prebuilt import ValidationNode from langgraph.graph.message import add_messages class SelectNumber(BaseModel): a: int @field_validator("a") def a_must_be_meaningful(cls, v): if v != 37: raise ValueError("Only 37 is allowed") return v builder = StateGraph(Annotated[list, add_messages]) llm = ChatAnthropic(model="claude-3-5-haiku-latest").bind_tools([SelectNumber]) builder.add_node("model", llm) builder.add_node("validation", ValidationNode([SelectNumber])) builder.add_edge(START, "model") def should_validate(state: list) -> Literal["validation", "__end__"]: if state[-1].tool_calls: return "validation" return END builder.add_conditional_edges("model", should_validate) def should_reprompt(state: list) -> Literal["model", "__end__"]: for msg in state[::-1]: # None of the tool calls were errors if msg.type == "ai": return END if msg.additional_kwargs.get("is_error"): return "model" return END builder.add_conditional_edges("validation", should_reprompt) graph = builder.compile() res = graph.invoke(("user", "Select a number, any number")) # Show the retry logic for msg in res: msg.pretty_print() ``` N validation) format_errornametagsschemasr"r#r$rct|jd||d|pt|_i|_|D]G}t |tr|jtd|j dt |jtrt|js td|j d|jd|j|j|j <t |trJt|ttfr.t!tt||j|j<t%|r!t'd |}||j|j<)td t|ddS) aInitialize the ValidationNode. Args: schemas: A list of schemas to validate the tool calls with. These can be any of the following: - A pydantic BaseModel class - A BaseTool instance (the args_schema will be used) - A function (a schema will be created from the function signature) format_error: A function that takes an exception, a ToolCall, and a schema and returns a formatted error string. By default, it returns the exception repr and a message to respond after fixing validation errors. name: The name of the node. tags: A list of tags to add to the node. NF)r#r$tracezTool z& does not have an args_schema defined.zVValidation node only works with tools that have a pydantic BaseModel args_schema. Got z with args_schema: . ValidationzPUnsupported input to ValidationNode. Expected BaseModel, tool or function. Got: )super__init___funcr _format_errorschemas_by_name isinstancer args_schema ValueErrorr#typer issubclassr BaseModelV1r__name__callabler)selfr%r"r#r$r base_model __class__s rr+zValidationNode.__init__ts. T4uMMM)B-B;=  F&(++ %-$S SSS$&.v/ABB%U%{UU?E?QUUU5;4F$V[11FD)) jK0// 9=T)_f8U8U$V_55&!! 8vNN 8B$V_55 vgklrgsgsvvv-  rinputct|trd}|}n*|dgx}rd}ntd|d}t|tstd||fS)z*Extract the last AIMessage from the input.listmessagesdictzNo message found in inputz Last message is not an AIMessage)r/r<getr1r)r7r: output_typer=messages r _get_messagezValidationNode._get_messages eT " " : K"HH:r22 2X : KK899 9&rl'9-- A?@@ @G##rconfigc|\}}dtdtffd }t|5}g|||j}|dkr|cdddSd|icdddS#1swxYwYdS)z*Validate and run tool calls synchronously.rrc j|d} t|tr0||d}|}net|t r0||d}|}n tdt|dt||dtt|dS#ttf$rS}t||||dtt|dddi cYd}~Sd}~wwxYw) Nr#argszUnsupported schema type: z$. Expected BaseModel or BaseModelV1.id)contentr# tool_call_idis_errorT)rIr#rJadditional_kwargs)r.r3rmodel_validatemodel_dump_jsonr4validatejsonr1r2r rstrrValidationErrorV1r-)rroutputrIer7s rrun_onez%ValidationNode._func..run_onesq)$v,7F fi00 #224<@@F$4466GG 44#__T&\::F$kkmmGG$fDLLfff##f!%c4:!6!6 $%67   " ..q$??f!%c4:!6!6'14&8  sCC11EAE EEr<Nr=)rCr r r map tool_calls)r7r:rDrArBrUexecutoroutputss` rr,zValidationNode._funcs $0077 W ( {      4%V , , -B Wg.@AABGf$$ - - - - - - - - #G,  - - - - - - - - - - - - - - - - - -s%A?/A??BB)r5 __module__ __qualname____doc__rr r2rr BaseExceptionr rQr<r+rr>rtuplerrCr r, __classcell__)r9s@rr r +sF BBR !%222(T)_4x?@2 xiI3NO  2  23i$2 222222h$*%S#X6$ sI~ $$$$ %-*%S#X6%-@N%- %-%-%-%-%-%-%-%-rr N)&r\collections.abcrrtypingrrlangchain_core.messagesrrr r langchain_core.runnablesr langchain_core.runnables.configr langchain_core.toolsr rlangchain_core.utils.pydanticrlanggraph._internal._runnablerlanggraph.warningsrpydanticrr pydantic.v1r4rRtyping_extensionsrr]r2rQrr rrrms/.......  DCCCCCFFFFFFFF??????::::::::::::////////000000<<<<<<((((((K K K Od;/ /K KKKK v (n-n-n-n-n-%n-n- n-n-n-r