run-llama/llama_index · error · ValueError

Cannot call query engine without specifying `input` paramete

Error message

Cannot call query engine without specifying `input` parameter.

What it means

Error "Cannot call query engine without specifying `input` parameter." thrown in run-llama/llama_index.

Source

Thrown at llama-index-core/llama_index/core/tools/query_engine.py:110

        )

        tool_config = IndexToolConfig(
            query_engine=self.query_engine,
            name=self.metadata.get_name(),
            description=self.metadata.description,
        )
        return LlamaIndexTool.from_tool_config(tool_config=tool_config)

    def _get_query_str(self, *args: Any, **kwargs: Any) -> str:
        if args is not None and len(args) > 0:
            query_str = str(args[0])
        elif kwargs is not None and "input" in kwargs:
            # NOTE: this assumes our default function schema of `input`
            query_str = kwargs["input"]
        elif kwargs is not None and self._resolve_input_errors:
            query_str = str(kwargs)
        else:
            raise ValueError(
                "Cannot call query engine without specifying `input` parameter."
            )
        return query_str

View on GitHub (pinned to afd0fef371)

Solutions

1. Pass an input parameter when calling the query engine tool.
2. Check the tool metadata so the agent knows to supply 'input'.

When it happens

Trigger: Thrown at llama-index-core/llama_index/core/tools/query_engine.py:110 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of run-llama/llama_index@afd0fef371 (2026-08-15). Data as JSON: /api/errors/7a6684f630ef38ad. Report an issue: GitHub.