> ## Documentation Index > Fetch the complete documentation index at: https://api-reference.scale.com/llms.txt > Use this file to discover all available pages before exploring further. # Rapid | Validators > Validators You can add validators to your project to help improve quality. Before a labeler submits a task, validators on the project will run and verify the response. A validator can be either blocking or non-blocking. # Validators You can add validators to your project to help improve quality. Before a labeler submits a task, validators on the project will run and verify the response. A validator can be either blocking or non-blocking. Blocking validators force labelers to fix their responses to pass the validator before submitting; whereas, non-blocking validators appear as dismissible warnings which can remind labelers to double-check their work before submitting. ## **NLP Validators** These validators can be setup for **text labels** which are available for the following use cases: **Text Generation**, **Text Transcription**, **Content Collection** | Validator Name | Description | Parameters | | ---------------------------------- | -------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | **Word Count** | This validator prevents responses that are too short or too long. | **Min words** *(optional)*

**Max words** *(optional)*

**Warning message** *(optional)* | | **Language & Gibberish Detection** | This validator detects the language of the response and whether or not the response is gibberish. | **Language** | | **Regex Blocklist** | You can use this validator to build regex rules to prevent the most common errors or enforce certain response formats. | **Regex rules**

**Matching policy**
This parameter defines the logical relationship between rules:
- Every rule should match
- Some rules should match
- None of the rules should match”

**Warning message** | | **String Blocklist** | Use this validator to prevent a blocklist of strings. These strings can be words, phrases, etc. | **Strings to block**

**Warning message** | | **Response Similarity** | Use this validator to prevent labelers from submitting text that overlaps with other text fields within the same response. | **Threshold**
The threshold is the number from 0 to 1 which means the relative Levenshtein distance between two pieces of text. We recommend using 0.3 and tuning this number by running the validator in Task Preview.

**Warning message** | | **Instructions Similarity** | This validator prevents labelers from submitting spam that overlaps with the task instructions. | **Threshold**
The threshold is the number from 0 to 1 which means the relative Levenshtein distance between two pieces of text. We recommend using 0.3 and tuning this number by running the validator in Task Preview.

**Warning message** | | **Grammar & Spellcheck** | This validator identifies grammar and spelling errors and suggests fixes. | | | **URL Formatting** | This validator enforces certain text labels to have URL format. | | | **Text Formatting** | Use this validator to ensure clean text responses | **Enforce sentence case capitalization**

**Prevent double whitespaces and trailing whitespaces**

**Enforce punctuation at the end of the response** | | **Diversity** | This validator prevents labelers from submitting text that follow the same patterns as previous attempts | **Regex**

**Min Attempts to Apply**
This is the minimum number of attempts for a labeler before this validator is applied to their future attempts.

**Max Attempts to Look Back**
This is the maximum number of previous attempts from the labeler to analyze.

**Threshold** *(optional)*
This is a number from 0 to 1 that represents the proportion of attempts that are analyzed and match the regex pattern before this validator triggers.

**Number of Matches to Trigger** *(optional)*
This is the number of previous attempts that match the regex pattern for this validator to trigger.

**Warning message** | ## **CV Validators** These validators can be setup for **geometry labels (box, ellipse, point, etc.)** or **segmentation clusters** which are available for the following use cases: **Object Detection**, **Object & Event Detection**, **Semantic Segmentation** | | | | | ---------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Size** | This validator restricts sizes of annotations to a specified minimum or maximum. | **Width (px)**

**Height (px)**

**Width (%)**
The % is based on the corresponding image/video width

**Height (%)**
The % is based on the corresponding image/video height

**Diagonal (px)**
The diagonal is calculated as the hypotenuse of the bounding box surrounding the object/segmentation.

**Min/max constraint**
Specifies whether or not ALL of the above constraints are to be used as minimum or maximum constraints.

**Logical operator**
If multiple above constraints are utilizes, specifies whether to combine them under "AND" logic or "OR" logic. | | **Label Usage** | Use this validator to define a minimum required or maximum allowed number of annotations per label. | **Min uses**

**Max uses**

**Warning message** | | **Contiguous Objects** | This validator checks that each annotation has contiguous frames. | | | **Collinear Points** | This validator checks that polygon and line annotations contain no more than 2 collinear points, which would imply that the same polygon could be drawn with fewer points. | | | **Duplicate Vertex** | This validator checks that polygon and line annotations do not contain multiple vertices with the exact same coordinate location. | | | **Overlap** | This validator checks that all annotations of each provided label overlap with all other such annotations, or that each is completely disjoint. | **Overlap validation**
If set to "should not overlap," checks for disjointness. If set to "should overlap," checks for overlaps. | | **Containment** | This validator checks that each annotation in a provided list of "inner labels" is contained by at least one annotation in a provided list of "outer labels," or contained by exactly zero such annotations. | **Inner labels**
The list of inner labels to check containment of.

**Outer labels**
The list of outer labels to check containment with.

**Containment validation**
If set to "should be contained," checks for containment. If set to "should not be contained," checks for the opposite. | | **Pixel Percentage** | This validator checks that the total percentage of pixels in a given label does not fall outside a specified minimum and maximum percentage. | **Min %**

**Max %** |