ZeroEval

ZeroEval is an AI Agents & Automation tool that helps AI agents improve after launch. It captures interactions, scores quality with defined judges, and optimizes prompts based on real usage.

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At a glance

Pricing

Likely Not Free

Free tier

API

Yes

Skill level

Technical

About

What is ZeroEval?

ZeroEval is a platform designed to make AI agents self-improving after deployment. It addresses the common problem of agents ceasing to improve post-launch by capturing every interaction, scoring quality with user-defined judges, and turning real usage data into better prompts. The platform allows for the installation of an SDK (Python & TypeScript) or OpenTelemetry for tracing, evaluation with built-in or custom judges for metrics like hallucinations and safety, and calibration through human feedback to teach the system user standards. It then optimizes agents by suggesting prompt, model, and code changes based on failure patterns, enabling deployment without redeploying the entire application. ZeroEval also features automatic PII redaction and offers a CLI and MCP server for agent interaction.

Best used for

Ideal for developers and data scientists who need to ensure their AI agents continuously improve, evaluate agent performance against custom quality bars, and automatically optimize prompts and models. Especially valuable for teams looking to turn real user interactions into actionable insights for agent refinement and deployment.

Common actions

evaluate AI agent performance

optimize AI agent prompts

monitor AI agent behavior

improve AI agent accuracy

debug AI agent failures

Capabilities

Key features

Capture agent interactions
Score quality with judges
Calibrate judges with feedback
Optimize prompts automatically
Redact PII automatically
Side-by-side comparison
Deploy changes without redeploying

Target Audience

developerdata scientistproduct managerstartup founder

Integrations

cursorclaude-codecodexopentelemetry

Pricing & Plans

Likely Not Free

Not publicly disclosed. Check zeroeval.com for current pricing.

FAQs

How does ZeroEval ensure data privacy with PII?

ZeroEval automatically detects and redacts sensitive data like emails, phone numbers, and SSNs before traces leave your infrastructure. This ensures that nothing sensitive is stored, with redaction happening locally before any network call.

Can ZeroEval integrate with existing agent development workflows?

Yes, ZeroEval offers Python & TypeScript SDKs, a REST API, and OpenTelemetry support for instrumentation. It also provides a CLI for querying evaluations and an MCP server for direct interaction with coding agents like Cursor and Claude Code.

What kind of judges can be used to evaluate AI agent quality?

ZeroEval supports both built-in judges for common issues like hallucinations, safety, and user frustration, as well as custom rubrics for domain-specific quality evaluation. It can also suggest judges based on your production traffic.

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