validate_prompt() — langchain Function Reference

Architecture documentation for the validate_prompt() function in agent.py from the langchain codebase.

Function python AgentOrchestration AgentExcecutor

Entity Profile

AgentOrchestration→ AgentExcecutor→ validate_prompt() — langchain Function Reference

Dependency Diagram

graph TD
  df20f73d_d278_027e_8a2e_0cb139b9cff4["validate_prompt()"]
  c55759c0_8c32_142f_44ff_2733a473d3e2["Agent"]
  df20f73d_d278_027e_8a2e_0cb139b9cff4 -->|defined in| c55759c0_8c32_142f_44ff_2733a473d3e2
  style df20f73d_d278_027e_8a2e_0cb139b9cff4 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/agents/agent.py lines 820–847

    def validate_prompt(self) -> Self:
        """Validate that prompt matches format.

        Args:
            values: Values to validate.

        Returns:
            Validated values.

        Raises:
            ValueError: If `agent_scratchpad` is not in prompt.input_variables
                and prompt is not a FewShotPromptTemplate or a PromptTemplate.
        """
        prompt = self.llm_chain.prompt
        if "agent_scratchpad" not in prompt.input_variables:
            logger.warning(
                "`agent_scratchpad` should be a variable in prompt.input_variables."
                " Did not find it, so adding it at the end.",
            )
            prompt.input_variables.append("agent_scratchpad")
            if isinstance(prompt, PromptTemplate):
                prompt.template += "\n{agent_scratchpad}"
            elif isinstance(prompt, FewShotPromptTemplate):
                prompt.suffix += "\n{agent_scratchpad}"
            else:
                msg = f"Got unexpected prompt type {type(prompt)}"
                raise ValueError(msg)
        return self