microsoft/autogen · error · ValueError

Strict mode is enabled, but not all input arguments are mark

Error message

Strict mode is enabled, but not all input arguments are marked as required. Default arguments are not allowed in strict mode.

What it means

Error "Strict mode is enabled, but not all input arguments are marked as required. Default arguments are not allowed in strict mode." thrown in microsoft/autogen.

Source

Thrown at python/packages/autogen-core/src/autogen_core/tools/_base.py:132

    @property
    def schema(self) -> ToolSchema:
        model_schema: Dict[str, Any] = self._args_type.model_json_schema()

        if "$defs" in model_schema:
            model_schema = cast(Dict[str, Any], jsonref.replace_refs(obj=model_schema, proxies=False))  # type: ignore
            del model_schema["$defs"]

        parameters = ParametersSchema(
            type="object",
            properties=model_schema["properties"],
            required=model_schema.get("required", []),
            additionalProperties=model_schema.get("additionalProperties", False),
        )

        # If strict is enabled, the tool schema should list all properties as required.
        assert "required" in parameters
        if self._strict and set(parameters["required"]) != set(parameters["properties"].keys()):
            raise ValueError(
                "Strict mode is enabled, but not all input arguments are marked as required. Default arguments are not allowed in strict mode."
            )

        assert "additionalProperties" in parameters
        if self._strict and parameters["additionalProperties"]:
            raise ValueError(
                "Strict mode is enabled but additional argument is also enabled. This is not allowed in strict mode."
            )

        tool_schema = ToolSchema(
            name=self._name,
            description=self._description,
            parameters=parameters,
            strict=self._strict,
        )
        return tool_schema

    @property

View on GitHub (pinned to 027ecf0a37)

Solutions

1. Remove default values from parameters or disable strict mode

Example fix

Make all parameters required (no defaults) when strict=True

When it happens

Trigger: Thrown at python/packages/autogen-core/src/autogen_core/tools/_base.py:132 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/autogen@027ecf0a37 (2026-08-15). Data as JSON: /api/errors/5845fda85c843146. Report an issue: GitHub.