Helping coding agents solve problems on the most complex codebases
Undo gives agents the runtime context they need to solve the most complex problems
AGENTS NEED CONTEXT TO WORK ON COMPLEX CODE
Mission-critical codebases are large, complex and unstructured. The hardest problems live in runtime state — execution paths, values flowing across module boundaries, effects far from their cause. Source code doesn’t capture it. Logs don’t capture it. So agents fill the gap with plausible guesses, and plausible isn’t good enough.
PURPOSE-BUILT FOR THE CODE THAT MATTERS MOST
Undo closes the gap. We produce a deterministic recording of runtime execution: every state change, every call, across every module. Agents query the recording to reason about what the program actually did — the way they already reason about what the code says. The result is fully automated root cause analysis, on problems that once took months of engineering effort or required your best engineers.
That’s why thousands of developers rely on Undo to prevent outages, keep codebases maintainable, and get more from the agents they already use.
WHAT PRODUCTS ARE AVAILABLE?
Undo started out as a fast-growing technology start-up founded by Greg Law and Julian Smith. Both began working evenings and weekends in Greg’s garden shed, determined to build a tool that would ease the pain of working with complex software.
For over a decade, Undo has built the technology to record exactly what software does as it runs, giving engineers on Linux a way to see what the program did, not just what the code says.
In 2026, software engineering changed: AI coding agents took on work that had always belonged to humans, and the limit of what they could reason about became the new bottleneck. That same recording is now what gives those agents the runtime context they need to solve the most complex problems on the most complex codebases.
LATEST NEWS
Undo AI: Runtime Context for AI Agents
AI agents don't have an intelligence problem. They have a context problem.
Undo hosts 2026 Customer Council
Earlier this year, we ran our 2026 Customer Council meeting in California, hosting senior and principal engineering leads from the world's largest technology organisations.
Undo raises $37 million
We have raised $37 million to accelerate product development and expand our global reach.