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# `langchain_core.runnables.configurable`.prefix_config_spec

langchain_core.runnables.configurable.prefix_config_spec(spec: ConfigurableFieldSpec, prefix: str) → ConfigurableFieldSpec

  Prefix the id of a ConfigurableFieldSpec.

  This is useful when a RunnableConfigurableAlternatives is used as a ConfigurableField of another RunnableConfigurableAlternatives.

  Parameters

    - spec (ConfigurableFieldSpec) – The ConfigurableFieldSpec to prefix.

    - prefix (str) – The prefix to add.

  Return type

    ConfigurableFieldSpec

  Returns: