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Tools / Guardrails
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Promptfoo

Guardrails

Open-source framework for testing LLM vulnerabilities and agent tool abuse.

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What it solves

Promptfoo helps teams secure their MCP deployments by providing guardrails capabilities tailored to agentic tool-calling environments.

How it works

The tool is deployed as self-hosted / cli. It integrates with MCP clients and servers to enforce the controls and visibility needed for safer agent operations.

Pros & cons

Pros

  • Purpose-built for guardrails use cases.
  • Deployment model: Self-hosted / CLI.
  • Active development and community or vendor support.

Considerations

  • Pricing signal: free / enterprise.
  • Verify latest features and pricing on the vendor website.
  • May require integration effort depending on your stack.

When to choose it

Consider Promptfoo when your team needs guardrails for MCP and wants a solution that fits a self-hosted / cli model at a free / enterprise price point.

Disclaimer: Tool capabilities and pricing change. Verify current details on the vendor's official website before making procurement decisions.