BerriAI/litellm · error · ValueError

RAG ingestion not supported for provider: {custom_llm_provid

Error message

RAG ingestion not supported for provider: {custom_llm_provider}. Supported providers: {list(provider_map.keys())}

What it means

Provider-map lookup failure in the RAG ingestion resolver: the given custom_llm_provider is not one of openai/bedrock/vertex_ai, so no ingestion class exists. A generic guard against unsupported provider strings.

Source

Thrown at litellm/rag/utils.py:38

    Returns:
        The ingestion class for the provider

    Raises:
        ValueError: If the provider is not supported
    """
    from litellm.llms.vertex_ai.rag_engine.ingestion import VertexAIRAGIngestion
    from litellm.rag.ingestion.bedrock_ingestion import BedrockRAGIngestion
    from litellm.rag.ingestion.openai_ingestion import OpenAIRAGIngestion

    provider_map: Final = {
        "openai": OpenAIRAGIngestion,
        "bedrock": BedrockRAGIngestion,
        "vertex_ai": VertexAIRAGIngestion,
    }

    ingestion_class: Final = provider_map.get(custom_llm_provider)
    if ingestion_class is None:
        raise ValueError(
            f"RAG ingestion not supported for provider: {custom_llm_provider}. "
            f"Supported providers: {list(provider_map.keys())}"
        )

    return ingestion_class


def get_rag_transformation_class(custom_llm_provider: str):
    """
    Get the appropriate RAG transformation class for a provider.

    Args:
        custom_llm_provider: The LLM provider name

    Returns:
        The transformation class for the provider, or None if not needed
    """
    if custom_llm_provider == "vertex_ai":

View on GitHub (pinned to 77b7c6c40c)

Solutions

1. Use a supported custom_llm_provider for RAG ingestion (one of the listed provider_map keys).

When it happens

Trigger: Thrown at litellm/rag/utils.py:38 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/9a62943bd841b5f6. Report an issue: GitHub.