crewAIInc/crewAI · error · ValueError

Both `use_case` and `tags` cannot be `None`

Error message

Both `use_case` and `tags` cannot be `None`

What it means

Error "Both `use_case` and `tags` cannot be `None`" thrown in crewAIInc/crewAI.

Source

Thrown at lib/crewai-tools/src/crewai_tools/tools/composio_tool/composio_tool.py:109

            ),
            composio_action=function,
            **kwargs,
        )

    @classmethod
    def from_app(
        cls,
        *apps: t.Any,
        tags: list[str] | None = None,
        use_case: str | None = None,
        **kwargs: t.Any,
    ) -> list[te.Self]:
        """Create toolset from an app."""
        if len(apps) == 0:
            raise ValueError("You need to provide at least one app name")

        if use_case is None and tags is None:
            raise ValueError("Both `use_case` and `tags` cannot be `None`")

        if use_case is not None and tags is not None:
            raise ValueError(
                "Cannot use both `use_case` and `tags` to filter the actions"
            )

        from composio import ComposioToolSet

        toolset = ComposioToolSet()
        if use_case is not None:
            return [
                cls.from_action(action=action, **kwargs)
                for action in toolset.find_actions_by_use_case(*apps, use_case=use_case)
            ]

        return [
            cls.from_action(action=action, **kwargs)
            for action in toolset.find_actions_by_tags(*apps, tags=tags)  # type: ignore[arg-type]

View on GitHub (pinned to 754d7323be)

Solutions

1. Provide either `use_case` or `tags` to filter actions; at least one is required.

When it happens

Trigger: Thrown at lib/crewai-tools/src/crewai_tools/tools/composio_tool/composio_tool.py:109 when the library encounters an invalid state.

Common situations: Occurs when both use_case and tags are None when filtering Composio actions. Provide either use_case or tags.

AI-assisted analysis of crewAIInc/crewAI@754d7323be (2026-08-15). Data as JSON: /api/errors/bc0f7d2cf0bcc74d. Report an issue: GitHub.