HKUDS/nanobot · error · ValueError

model and model_preset are mutually exclusive

Error message

model and model_preset are mutually exclusive

What it means

Error "model and model_preset are mutually exclusive" thrown in HKUDS/nanobot.

Source

Thrown at nanobot/agent/model_runtime.py:229

            self._tracks_provider_generation,
            self._default_selection_signature,
        ) = (
            runtime,
            runtime.model_preset is None,
            default_selection,
        )
        return runtime

    def resolve_override(
        self,
        *,
        model: str | None,
        model_preset: str | None,
        config: Config | None = None,
    ) -> LLMRuntime | None:
        """Resolve an SDK-style per-run override without mutating the default."""
        if model is not None and model_preset is not None:
            raise ValueError("model and model_preset are mutually exclusive")
        if model_preset is not None:
            return self.resolve_preset(model_preset)
        if model is None:
            return None
        if config is None:
            return LLMRuntime(
                provider=self._runtime.provider,
                model=model,
                generation=self._runtime.generation,
                context_window_tokens=self._runtime.context_window_tokens,
                snapshot_signature=("model_override", model),
            )

        base = config.resolve_preset(self.model_preset)
        preset = base.model_copy(update={"model": model, "provider": "auto"})
        return self.resolve_snapshot(build_provider_snapshot(config, preset=preset))

View on GitHub (pinned to 42f37dc4c0)

When it happens

Trigger: Thrown at nanobot/agent/model_runtime.py:229 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of HKUDS/nanobot@42f37dc4c0 (2026-08-26). Data as JSON: /api/errors/b7aa54eb57a6a7fe. Report an issue: GitHub.