AI-Generated Code Needs Guardrails. Curtail Delivers Them.
AI-generated code can't be trusted. Curtail's ReGrade™ catches errors and feeds fixes back to the LLM — closing the loop for safe, accurate code.
Works with your AI coding tools via MCP (Model Context Protocol)
Curtail's ReGrade finds and fixes errors in AI-generated code
AI-generated code creates hallucinations and unasked-for changes, all while insisting the code is correct. ReGrade uses packet-level analysis to catch these errors and feeds critical information back to the LLM for better solutions.
Powered by NCAST
NCAST (Network Comparison Application Security Testing) is Curtail's patented technology. It sends identical requests to both current and candidate software versions, compares responses at the packet level, and identifies unexpected behavioral differences — no CVEs, prior knowledge, or source code access needed.
No Prior Knowledge Required
No CVEs, vulnerability databases, or source code access needed. NCAST detects behavioral differences purely by comparing traffic between versions.
Record and Replay
Capture any traffic — test, production, synthetic — and replay it against candidate versions. ReGrade doesn't care where the traffic comes from. The more the better.
Zero Code Changes
Operates at the network layer. No SDK, no agents, no instrumentation in your application code.
Capabilities
Preview Changes to Prevent Costly Rollbacks
Use real production traffic to test the quality of software upgrades and patches. Enable regression testing in development, QA, and production.
Pinpoint Software Flaws
Behavioral changes, environment misconfigurations, platform inconsistencies, undocumented API updates, 3rd party integration changes, and performance degradations.
Behavior Observability
ReGrade systematically captures where flaws occur and provides a map of actionable information so that the developer can recreate and fix the issue using packet capture playback.
Shorten DevOps Cycles
By finding bugs and providing actionable intelligence to triage and fix issues, ReGrade helps DevOps teams release more quickly and with higher quality. It is a critical component of a CI/CD pipeline.
Zero-Day Vulnerabilities
Zero-Day attacks target software flaws that are not yet known to the developer. ReGrade finds such flaws before hackers.
Save Time And Money
Downtime can cost as much as $500k an hour and intense customer dissatisfaction. ReGrade helps preview how new software will work, therefore measurably reducing downtime risk.
Built into your AI coding workflow
Why Curtail's ReGrade?
Implicit Testing
Every API call becomes a test case — no test scripts to write or maintain.
Production-Grade Confidence
Test with real traffic patterns, not synthetic data.
Patented NCAST Technology
Built on NCAST (Network Comparison Application Security Testing) — packet-level analysis that works with any traffic source, requires no code changes, and handles encrypted traffic transparently.
Get the guardrails you need for safe & accurate AI code
See how ReGrade catches errors in AI-generated code and feeds fixes back to the LLM.