Beware of Strangers Bearing Code: Open Source Trust in the Agent Era

Open source has always run on a simple trust model: contributions are scarce, contributors are known, and review keeps quality high. AI broke all three assumptions at once. Maintainers are already closing the door: some projects now ban drive-by AI PRs outright. But closing the door isn't the answer. Maintainers need to prepare their repos for AI coding assistants rather than push well-meaning contributors away. This talk argues the OSS trust model needs five concrete operational changes. Provenance over identity: Review the path a change took, not just who pushed it. Patterns: signed agent attestations, PR templates that surface generation context, and CI provenance checks. Agent declaration standards: Require contributors to declare which tool generated a PR, a DCO for the agentic era. Layered triage: Automated reviewers handle style, security, and test coverage, giving contributors faster feedback and freeing maintainers for higher-order decisions. Sandboxed execution for untrusted code: Test external contributions in isolated environments so a malicious or broken PR can't poison the build cache or compromise the code. Self-healing CI: When the build breaks, an agent opens a fix PR rather than waiting for a human. Drawing on real-world experience and lessons, this session also addresses what doesn't change: code of conduct, governance, and community health matter more than ever when contributors are non-human.