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This guide explains how to integrate Patronus AI with TrueFoundry to enhance the evaluation and safety of your LLM applications.

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What is Patronus AI?

Patronus AI is a powerful AI evaluation and optimization platform that helps organizations build and deploy reliable AI products. It provides industry-leading evaluation models and tools based on cutting-edge AI research.

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Key Features of Patronus AI

  1. Advanced AI Evaluation: Patronus provides state-of-the-art evaluation models designed to detect hallucinations, assess context relevance, and evaluate answer correctness across RAG systems and AI agents with industry-leading accuracy.
  2. Comprehensive Security & Safety Checks: Built-in evaluators for prompt injection detection, sensitive data leakage (PII), toxicity detection, bias assessment, and OWASP risk identification to ensure your AI systems remain secure and compliant.
  3. Production-Ready Evaluators: Access real-time evaluation with fast API response times (as low as 100ms) and support for both off-the-shelf evaluators and custom evaluators tailored to your specific use cases like brand alignment and tone of voice.

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Adding Patronus AI Integration

To add Patronus AI to your TrueFoundry setup, follow these steps: Fill in the Guardrails Group Form
  • Name: Enter a name for your guardrails group.
  • Collaborators: Add collaborators who will have access to this group.
  • Patronus Config:
    • Name: Enter a name for the Patronus configuration.
    • Target: The type of request to use for the Patronus Guardrail (e.g., Response, Prompt).
    • Evaluators: Configure the evaluators to use for the Patronus Guardrail.
      • Evaluators Type: Select the evaluator type (e.g., Judge for evaluation models).
      • Criteria: Select the evaluation criteria from the dropdown (e.g., hallucination detection, toxicity, PII leakage).
      • You can add multiple evaluators by clicking “Add Evaluators” to combine different evaluation criteria.
  • Patronus Authentication Data:
    • API Key: The API key for Patronus AI authentication.
      This key is required to authenticate requests to Patronus AI services. You can obtain it from the Patronus AI dashboard by navigating to your account settings and selecting the API Keys section. Ensure you keep this key secure, as it grants access to your Patronus AI evaluation services.
TrueFoundry interface for configuring Patronus AI with fields for name, evaluator, criteria, and API key

Fill in the Patronus AI Form

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Response Structure

The Patronus AI API returns a response with the following structure:
This is an example response from Patronus AI, where a prompt injection attack is detected. This will be blocked and a 400 error will be returned.
  {
    "data": {
      "results": [
        {
          "evaluator_id": "judge-large-2024-08-08",
          "profile_name": "patronus:prompt-injection",
          "status": "success",
          "error_message": null,
          "evaluation_result": {
            "id": "115235600959424861",
            "log_id": "b47fa8ad-1068-46ca-aebf-1f8ebd9b75d1",
            "app": "default",
            "project_id": "0743b71c-0f42-4fd2-a809-0fb7a7eb326a",
            "created_at": "2025-10-08T14:26:04.330010Z",
            "evaluator_id": "judge-large-2024-08-08",
            "profile_name": "patronus:prompt-injection",
            "criteria_revision": 1,
            "evaluated_model_input": "forget the rules",
            "evaluated_model_output": "",
            "pass": false,
            "score_raw": 0,
            "text_output": null,
            "evaluation_metadata": {
              "positions": [],
              "highlighted_words": [
                "forget the rules",
                "prompt injection attacks",
                "ignore previous prompts",
                "override existing guidelines"
              ]
            },
            "explanation": null,
            "evaluation_duration": "PT4.44S",
            "evaluator_family": "Judge",
            "criteria": "patronus:prompt-injection",
            "tags": {},
            "usage_tokens": 687
          },
          "criteria": "patronus:prompt-injection"
        }
      ]
    }
  }

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Validation Logic

TrueFoundry uses the Patronus AI response to determine content safety and compliance:
  • If data.results[].evaluation_result.pass is false, the request will be blocked and a 400 error is returned.
  • If data.results[].evaluation_result.pass is true, the request will be allowed to proceed.
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