AI Semantic Prompt Guard Policy

Allow and deny messages using Valkey

Allow messages about a topic as long as they don’t contain information about another topic.

For example, only allow questions about DevOps that aren’t related to exploiting vulnerabilities. Topics on the deny list take precedence over the allowed topics.

Valkey is automatically detected when using the redis vectordb strategy. AI Gateway queries the server and uses the Valkey-specific driver when it detects a Valkey backend.

If you use the text-embedding-ada-002 as an embedding model, you must set a fixed dimension of 1536, as required by the official model specification. Alternatively, use the text-embedding-3-small model, which supports dynamic dimensions and works without specifying a fixed value.

Prerequisites

  • An existing AI Model.

  • A Valkey 8.x instance.

  • Port 6379, or your custom Valkey port, is open and reachable from AI Gateway.

Environment variables

  • OPENAI_API_KEY: Your OpenAI API key

  • VALKEY_HOST: The host where your Valkey instance runs

Set up the policy

Attach the policy

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