U.K.-based software debugging startup Undo Ltd. has raised $37 million in new funding to expand internationally and push its debugging technology into tools for code written with artificial intelligence. Founded in 2005, the company records the full execution history of a running program and saves it to a single file, capturing what the code actually did at runtime. Undo argues that an AI agent cannot reliably track down why code fails unless it can see runtime behavior. The company says its benchmarks show that on a set of complex bugs, the latest AI models identified the root cause 38% of the time on their own, rising to 92% when given Undo’s runtime recordings, and that customers report completing root-cause analysis up to 100 times faster. Palo Alto Networks Inc. is a customer; its senior vice president of engineering, Suresh Sangiah, said Undo often pinpoints the cause autonomously in minutes. The funding round was led by Elsewhere Partners, an Austin-based private equity firm, and will go toward hiring on Undo’s product, support and sales teams in the United States and Europe. Founder and Chief Executive Greg Law said the technology has become essential with the rise of AI.