Promptfoo vs FlowLink
Testing vs Runtime Protection
Promptfoo is an excellent testing and evaluation framework for LLMs — it helps you find vulnerabilities before deployment. But what happens in production? FlowLink provides runtime governance: real-time policy enforcement, command interception, eBPF monitoring, and credential management for agents already running in your infrastructure. They're complementary — use Promptfoo for testing, FlowLink for production.
Feature Comparison
| Feature | Promptfoo | FlowLink |
|---|---|---|
| MCP Protocol Native | ✕ | ✓ |
| Runtime Policy Enforcement | ✕ | ✓ |
| eBPF Kernel Monitoring | ✕ | ✓ |
| Credential Vault | ✕ | ✓ |
| Network Bastion | ✕ | ✓ |
| Red-Teaming / Testing | ✓ | ✕ |
| LLM Evaluation Framework | ✓ | ✕ |
| Command Approval Workflow | ✕ | ✓ |
| Self-hosted Option | ✓ | ✓ |
| Open-source Core | ✓ | ✓ |
| Audit Trail | ✕ | ✓ |
| Free Tier | ✓ | ✓ |
Testing vs Production: Different Problems
Complementary, Not Competing
Promptfoo finds vulnerabilities in development. FlowLink enforces policies in production. Use both for defense-in-depth.
Runtime When It Matters
Testing catches known patterns. Runtime governance catches the unknown — zero-day agent behaviors in live environments.
Full Agent Lifecycle
FlowLink governs credentials, network access, and command execution — areas testing tools never touch.