Prefactor

What is Prefactor?

Prefactor is an agent observability and evaluation platform that scores every run in production for quality, drift, and risk, then wires those evaluations into action. It provides real-time tracing, custom evals, and runtime enforcement with human-in-the-loop approval. The platform integrates with TypeScript and Python SDKs, native for LangChain, Claude, Vercel AI, OpenClaw, and LiveKit, and supports custom spans to bring any datasource into the run. Prefactor also offers versioning, staging, and promotion for agents, plus enterprise security features.

What can Prefactor do?

• 01

  Real-time evaluation

  Scores every run in production for quality, drift, and risk.

• 02

  Runtime enforcement

  Holds, approves, or blocks risky actions via SDK or API.

• 03

  Custom spans

  Attach any datasource to a run for grounded evals.

• 04

  Versioning & promotion

  Version agents, promote through dev/staging/prod with eval gates.

• 05

  Native SDK integrations

  TypeScript & Python SDKs for LangChain, Claude, Vercel AI, OpenClaw, LiveKit.

• 06

  Sensitive-data detection

  Detects 17 categories of sensitive data in agent traffic.

• 07

  Human-in-the-loop

  Pause high-risk actions for human approval before execution.

Use Cases

• “AI engineering teams — Score every production agent run for quality, drift and risk as it happens so a failing agent is caught live instead of in a later report.
• “Reliability teams — Pause risky runs and enforce policies at runtime through the SDK or API to keep production agents within guardrails.
• “Compliance & risk teams — Detect sensitive data across agent traffic and route high-risk actions to a person for approval before they execute.
• “Platform teams — Version agents and promote them through dev, staging and production behind eval-gated checks to track quality release over release.