NEW RESEARCH REPORT: Overcoming the limitations of coding agents in complex software systems
Diagnose the root cause of your hardest bugs in minutes, not weeks
The Undo Suite for C/C++
AI-powered root cause analysis for large-scale complex applications
Undo gives your coding agent the runtime context it needs to solve the hardest problems in complex software.
Undo captures complete program execution – every state change, execution path, function call and data flow – into a recording file and makes that recording available to coding agents.
Recordings are the antidote to hallucination. They are the only way agents can access the runtime context needed to understand what actually happened, reason about software behavior, and solve problems that code alone cannot explain.
Automate root cause analysis of non-trivial issues (e.g. concurrency defects, memory corruptions, flaky tests) and get tickets resolved
Resolve issues up to 100x faster – deliver software faster or resolve customer issues faster
Solve problems previously beyond the reach of AI agents and maintain a stable codebase at scale
AI-Powered Root Cause Analysis
with Full Execution Context
Modern AI coding assistants like Claude Code, Copilot, Codex, and Cursor can read static code and suggest fixes — but they can’t see what actually happened at runtime.
Undo gives AI that missing context, so you can avoid AI hallucinations.
Undo’s deterministic recording technology records a program’s exact execution: every variable, every event, every I/O, across every module.
Agents can then query the recording to reason about dynamic behavior the way they already reason about code.
With access to a deterministic execution recording — AI agents can:
“ Trace exactly when and why a variable changed”
“ Identify the root cause of crashes or exceptions”
“ Follow the precise chain of events that led to a failure”
Instead of guessing from static code, AI agents can analyze the real execution timeline.
Using Undo AI, engineers — and their coding agents — can ask questions like:
“ Why did this variable change here?”
“ What caused this null pointer dereference?”
“ What was the thread state when the crash occurred?”
Answers come directly from the deterministic execution history captured by Undo.
Undo integrations with the coding agents you already use
KEY BENEFITS
Applications
FIX CUSTOMER-REPORTED BUGS
Debugging customer issues is painful, time-consuming, and stressful.
Often, it can be almost impossible to recreate the conditions under which the application is running and the defect occurred. Time to fix becomes unpredictable.
The pressure is on. Uncomfortable conversations ensue. Perhaps even dreaded escalations.
FIX YOUR FLAKY TEST PROBLEM
Same execution environment and different test results each time?
You have a flaky test problem. They are typically caused by defects that are intermittent… and therefore hard to reproduce.
Customers integrate Undo into their CI / Test Suite to continually run flaky tests under recording. When the test fails again, you then have a recording!
FIX BUGS IN DEVELOPMENT & TEST
Debugging test failures in large, complex codebases is challenging. Regression tests can take days to run, making issues slow to reproduce. Recompiling is expensive and setting up debug sessions is tedious.
Deploy Undo in your CI or automated tests and debug failures instantly – no reproduction steps, recompilation, or debug session setup required.
FIX BUGS IN THE FIELD (OEM SOLUTION)
The hardest bugs are ones that only happen on the customer’s system.
Ship Undo as part of your product. Switch it on to capture the bug in a recording file and switch it off. The recording will contain all the execution data you need. Root cause the issues without repeatedly sending builds to the customer and searching for a minimal reproducer.
Undo is used in production by some of the world’s most confidentiality-sensitive businesses. Send the recording back to your engineers for analysis, debug it in the field or exchange auditable, text-based analysis scripts for maximum transparency.
What software engineers say
Key features
PORTABLE RECORDING FILES
Recordings capture everything your application did. They replay the same, every time, everywhere. They can be replayed outside of the original environment and shared with your team.
ADVANCED STATE INSPECTION WITH TIME TRAVEL
Replay recordings forward and backward to inspect full application state, including the contents of all variables and the heap.
CATCH RACE CONDITIONS
Thread Fuzzing randomizes thread execution to expose concurrency bugs in multithreaded codebases.
GDB COMPATIBLE
If you’re already familiar with GDB, it’s just a handful of new commands to unleash the power of time travel.
IDE INTEGRATION
Undo plugs into whatever IDE you prefer (VS Code, CLion, Emacs).
WORKS WITH YOUR EXISTING SYSTEMS
No set up required. No compilation or build changes. No kernel or system configuration.
API CONTROL
Control recording from Undo’s library API to capture what you need, on demand.
FASTER THAN YOU THINK
1.5-5x slowdown whilst capturing on real-world programs, thanks to a just-in-time instrumentation engine that captures only what’s necessary.
1ST CLASS SUPPORT
Direct access to Undo engineers and debugging experts to make Undo work smoothly in your environment.
Why is Undo different?
BEFORE UNDO
Wasting days and still getting unreliable outputs
AI agents struggle on non-trivial issues in complex codebases. They have access to the whole source code, perhaps some logs; yet outputs remain unreliable. Not because your model is bad, but because it lacks runtime context. The hardest problems in million-line codebases live in runtime state (not static code).
WITH UNDO
Automated evidence-based root cause analysis in minutes
Recordings are the antidote to hallucination. They are the only way AI agents can access the runtime context needed to understand what actually happened, reason about software behavior, and solve problems that code alone cannot explain.
CI & Test Automation Tools
Want to automate the generation of recording and store them in your CI or bug tracker?
No problem. You can integrate Undo with all popular CI and Test Automation tools, including Jenkins, Maven, Circle CI, or TeamCity.
The core technology is language independent and compatible with most mainstream Linux distributions.
FAQs
Common questions
Here are some frequently asked questions and answers you may find helpful. Detailed technical documentation is also available in the docs.