Why build it? In daily agent coding, we kept seeing the same problems: - A small edit can accidentally break syntax (missing bracket, misplaced comma), so the next step fails for reasons unrelated to the task. - Many compiler/tool errors are written for humans, not for automation. The agent can see "something is wrong" but not "make this exact fix at this exact spot." X07 is an attempt to reduce those failure modes by making edits, diagnostics, and execution modes more predictable for agents.