Gremlin is an autonomous engineering agent built to handle the long tail of small, well-scoped engineering tasks — Sentry issues, Linear tickets, and Slack instructions — by turning them into reviewable pull requests. It uses Mastra for orchestration and OpenCode as the sandboxed coding agent. The key insight is that sandboxing alone isn't enough; the harder problem is orchestration: framing tasks correctly, injecting credentials and context, enforcing access boundaries, and routing results back into normal review workflows. The PR is the deliberate output interface, leveraging existing CI, code review, and branch protection workflows. The longer-term vision includes a 'Fix with AI' button embedded in Prisma surfaces like Query Insights, wired to Gremlin's orchestration layer to return a PR instead of a copyable prompt.
