Sandbox replay gate for repository patch acceptance
A repository agent can ship with a mandatory execution gate before any patch is accepted. The evidence this week is specific enough to support a concrete build: run every proposed edit inside an isolated container, require fail-to-pass tests to pass with no pass-to-pass regressions, and feed real stdout, stderr, and test failures back into a repair loop. AgentForge reports 40.0% resolution on SWE-bench Lite with this structure, using a network-isolated Docker sandbox and up to three debugger retries. That is a stronger operational pattern than accepting patches from model output alone.
The first user is the team already trying code agents on test-bearing repositories and seeing plausible diffs fail in CI. A cheap check is narrow: take one repository with stable tests, insert a hard execution requirement before merge, and measure how many agent patches survive replay without human cleanup. If the pass rate rises while review burden falls, the gate is doing useful work. If the repository lacks reliable tests, this workflow stalls fast, so the build should begin where execution already has teeth.