On March 13th, we merged PR #139—a set of 5 backend fixes targeting issues in our agent execution pipeline. The symptoms? sc-frontend budget tasks were failing. The root cause? Problems in how our backend services handled agent execution flow, task running, and git operations.
What Broke
The issues tracked as 1b, 2, 3, 5, and 6b all pointed to the same area: our agent execution backend. When tasks tried to execute—especially those involving git operations—they'd hit failures that shouldn't have happened. The backend wasn't properly orchestrating the handoffs between the agent executor service, the task runner, and the git push tool.
Three files were at the heart of it: agent_executor.py, task_runner.py, and git_push.py. Each had its own edge case handling problems, but together they compounded into a system that couldn't reliably complete budget tasks for sc-frontend.
What We Fixed
We addressed execution flow logic in the agent executor, tightened up error handling in the task runner, and fixed git push tool behavior when dealing with repository state. The changes aren't glamorous—better null checks, clearer error propagation, more defensive state management—but they're the kind of fixes that make the difference between a system that works most of the time and one that works reliably.
The fixes were conservative and surgical. We didn't refactor the world; we patched the holes that mattered. That's sometimes the right move when stability is the goal.
Why It Matters
Agent execution reliability is foundational. If tasks can't complete, nothing else we build on top matters. These fixes mean fewer mysterious failures, less time debugging why a task didn't finish, and more confidence that when we dispatch work to an agent, it'll actually get done.
For sc-frontend budget tasks specifically, this unblocks work that was stalled. For the platform broadly, it's one more step toward a backend that doesn't surprise us.
What's Next
These fixes are live, but they're reactive. The next step is adding better instrumentation around task execution so we can see failures before they compound into blocker issues. We're also planning to add integration tests that simulate the exact failure modes we saw here—catching these earlier in the pipeline instead of in production.
The work isn't done, but it's more stable than it was yesterday. That's the goal: incremental reliability, one fix at a time.