> For the complete documentation index, see [llms.txt](https://docs.imerit.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.imerit.net/3d-multi-sensor-fusion/labeling/3d-multi-sensor-fusion-labeling-editor/key-features/sanity-checks.md).

# Sanity Checks

Sanity Checks are intelligent guardrails built into the 3D Multi-Sensor Fusion Labeling Editor that automatically monitor annotation quality in real time. They help annotators maintain geometric consistency and physically realistic object behaviour across frames - catching errors at the point of creation rather than during QA review.

Each check runs continuously in the background and surfaces a non-blocking visual cue or warning only when a configured threshold is violated. Checks are configurable at the project workflow level (recipe) or in the project ontology, depending on the check type, and can be tuned to match customer guidelines or iMerit-recommended defaults.

{% hint style="success" icon="lightbulb-on" %}
Sanity Checks are non-blocking - annotators can always submit a task even when warnings are active. Persistent warnings are visible to QA reviewers and provide context for ambiguous or low-confidence annotations.
{% endhint %}

***

## Introduction to Sanity Checks

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Different types of available Sanity Checks

1. [Plausible Object Motion](/3d-multi-sensor-fusion/labeling/3d-multi-sensor-fusion-labeling-editor/key-features/sanity-checks/plausible-object-motion.md)
2. [Plausible Object Rotation](/3d-multi-sensor-fusion/labeling/3d-multi-sensor-fusion-labeling-editor/key-features/sanity-checks/plausible-object-rotation.md)
3. [Minimum LiDAR Point Density](/3d-multi-sensor-fusion/labeling/3d-multi-sensor-fusion-labeling-editor/key-features/sanity-checks/minimum-lidar-point-density.md) - currently not configurable from Ango Hub project settings
4. [Class-Based Cuboid Dimensions](/3d-multi-sensor-fusion/labeling/3d-multi-sensor-fusion-labeling-editor/key-features/sanity-checks/minimum-maximum-cuboid-volume.md)