# AgentClash vs Promptfoo

Promptfoo is categorized here as prompt eval. AgentClash focuses on complete, tool-using agent trajectories in isolated sandboxes.

Source: https://www.agentclash.dev/compare/agentclash-vs-promptfoo
Markdown export: https://www.agentclash.dev/md/compare/agentclash-vs-promptfoo

## Where each tool fits

Promptfoo is an excellent open-source, config-first tool for prompt testing and red-teaming across providers. It's a great fit for fast, declarative assertions over model outputs.

## Capability comparison

| Capability | AgentClash | Promptfoo |
| --- | --- | --- |
| Multi-turn agent loops | Yes | No |
| Sandboxed tool execution | Yes | No |
| Same-task concurrent eval | Yes | No |
| Trajectory scoring | Yes | No |
| Cross-provider tool-call normalisation | Yes | Partial |
| Four-vantage composite verdict | Yes | Partial |
| Failures auto-promote to regression | Yes | Partial |

## Common questions

### Is AgentClash a Promptfoo alternative?

AgentClash and Promptfoo overlap but solve different problems. Promptfoo is a prompt eval tool, while AgentClash is an agent-evaluation platform that runs agents on real tasks in a sandbox, scores the full trajectory, and gates CI on regressions. If you need to evaluate tool-using agents end-to-end, AgentClash is the closer fit; for single-call prompt and output scoring, Promptfoo may be all you need.

### What is the difference between AgentClash and Promptfoo?

Promptfoo is an excellent open-source, config-first tool for prompt testing and red-teaming across providers. It's a great fit for fast, declarative assertions over model outputs. AgentClash focuses on multi-turn agents that take actions: each model gets a fresh microVM, real tools, the same time budget, and a same-task eval run, and the verdict scores the trajectory — not just the final text.

### Can I use AgentClash and Promptfoo together?

Yes. Many teams keep Promptfoo for prompt-level evaluation and observability and add AgentClash for end-to-end, sandboxed agent evals and CI regression gates. They are complementary layers of an evaluation stack.