Google's AI agent migrates 174,000 lines of Fortran ocean model to Rust in 59 minutes

Google's Antigravity team reported that an AI agent ported the core of FVCOM, a coastal ocean model written in Fortran, into memory-safe Rust in about an hour. The run uncovered six silent bugs that had existed in the solver since the 1990s, cut memory use in half, and ran 1.88 times faster than the original compiled code. The agent first spent 11 minutes building a benchmark baseline from the original code, which let the team verify the port by comparing outputs across 100 random seeds. Google has also released the pipeline as an open-source skill in its google/skills repository, positioning it as reusable tooling rather than a one-off demonstration.