Sentence Count Guardrail

This policy provides the capability to perform sentence count-based validation on incoming or outgoing JSON payloads. This component acts as a guardrail to enforce specific content moderation rules based on configurable minimum and maximum sentence counts and JSON path expressions.

Configure Sentence Count Guardrail

1. In the left navigation menu, click Develop, then select Policy.

2. Click the Add policy icon in the required resource → Request/Response Flow → Attach Mediation Policy.

3. Add the policy information and click Save.

The following table lists and describes the configuration parameters available for the Sentence Count Guardrail policy:

Parameter Name	Description
Guardrail Name	The name of the guardrail policy. This will be used for tracking purposes.
Minimum Sentence Count	The minimum number of sentences the content must contain.
Maximum Sentence Count	The maximum number of sentences the content can contain.
JSON Path	The JSONPath expression used to extract content from the payload. If not specified, the entire payload will be used for validation.
Invert the Guardrail Decision	If enabled, inverts the guardrail blocking decision, causing the guardrail to intervene and return an error response when the sentence count is within the specified range.
Show Guardrail Assessment	When enabled, the error response will include detailed information about the reason for the guardrail intervention.

1. Save the API and Deploy the API to apply the policy to the gateway.

Sample Sentence Count Guardrail Configuration

• Guardrail Name: Sentence Count Guardrail
• Minimum Sentence Count: 1
• Maximum Sentence Count: 3
• JSON Path: $.messages[0].content
• Invert the Guardrail Decision: false
• Show Guardrail Assessment: true

Sample Payload to be intervened from the Sentence Count Guardrail

{
  "messages": [
    {
      "role": "user",
      "content": "This is a test message. This is another test sentence. It contains more than three sentences. Therefore, the sentence count guardrail should fail."
    }
  ]
}

Sample Response after Sentence Count Guardrail Intervention

{
    "code": 900514,
    "message": {
        "action": "GUARDRAIL_INTERVENED",
        "actionReason": "Violation of applied sentence count constraints detected.",
        "assessments": "Violation of sentence count detected. Expected between 1 and 3 sentences.",
        "direction": "REQUEST",
        "interveningGuardrail": "Sentence Count Guardrail"
    },
    "type": "SENTENCE_COUNT_GUARDRAIL"
}