Pre-execution verification for AI agents

Ship Agents Fast. Let the Duck Worry.

Drop-in middleware for LangChain, CrewAI, and AutoGen. Five minutes to integrate. Zero minutes spent babysitting agents.

Sign up free. No credit card.

Your competitors are shipping agents while you're still reviewing logs from last week.

rubber-duck verify --watch
plan.action: deploy_to_prodpending
plan.action: delete_all_userspending
plan.action: retry_payment(x3)pending
plan.action: send_notificationpending
plan.action: scale_instances(100)pending
Works with
LangChainCrewAIAutoGenOpenAI SDKAnthropic SDK
The Problem

Your agents are running blind

01

You've delayed launching because you can't guarantee agents won't go off-script

02

Your team babysits agent runs instead of building the next feature

03

Post-mortem tools are great — if you enjoy reading incident reports at 2am

Drop-in SDK for LangChain, CrewAI, and AutoGen — integrates in under 5 minutes

🛡️How It Protects

Three layers of defense

Playful illustration of two AI models checking each other's work
01

Cross-Model Verification

GPT reviews Claude. Claude reviews GPT. A second AI family catches blind spots the original model cannot see.

Playful illustration of a rubber duck stopping a loop spiral
02

Loop Detection & Circuit Breaker

Detects repeating plan patterns in real-time and recommends circuit-breaker actions before costs spiral.

Playful risk score gauge with duck-themed color segments
03

Risk Scores & Verdicts

Every plan gets an approve, flag, or reject verdict with a numeric risk score and actionable suggestions.

Integration

Four steps to verified agents

Waddle in
01

Add the middleware

One import. One line of config. Works with LangChain, CrewAI, and AutoGen.

Quack check
02

Agent submits plan

Before any action executes, the plan payload is sent to Rubber Duck for review.

Duck huddle
03

Cross-model verdict

A different model family analyzes the plan and returns approve / flag / reject.

Smooth sailing
04

Act with confidence

Your agent proceeds only when the plan is verified. Loops and bad plans never execute.

🎯The Promise

One middleware call. Approve, flag, or reject — before anything executes.

“Drop-in SDK for LangChain, CrewAI, and AutoGen — integrates in under 5 minutes”
Validated by research
Cross-model AI verification
🚀Start Now

Stop guessing. Start verifying.

Add pre-execution verification to your agent pipeline in under 5 minutes. Free loop detection included. No credit card required.

Your competitors are shipping agents while you're still reviewing logs from last week.