Why We Tightened Agent Scope After a 200-Line Refactor Overshoot

TL;DR: A single agentic refactor overshot its target by four times, prompting us to switch from optional editing to required scope limits. Full write-up: Agentic Coding Overshoot.

The Context

Our team runs a strict definition of done for refactors: touch only what was named, preserve existing abstractions, and avoid extracting new utilities unless explicitly requested. An AI coding tool operating with default agentic scope violated all three on a task that was supposed to be a pure rename in a data-access module.

What We Tested

Tool	Use Case	Verdict	Why
Agentic AI editor (default scope)	Targeted rename in data-access module	❌	Rewrote module organization; extracted four unrequested utilities
Same AI editor (scope-restricted prompt)	Same rename	✅	Stayed within target; minimal diff
Deterministic IDE refactor	Same rename	✅	Exhaustive and minimal; reproducible

The Pivot Point

The 200-line overshoot was the obvious number. Less obvious was the hours spent deciding what to keep. The extracted utilities were internally coherent but introduced a new dependency graph the team had not designed or approved. Reviewer time, rollback negotiation, and post-merge cleanup cost more than writing the rename by hand would have. We treated this as a process failure, not a model failure.

What We Use Now

We require every AI-assisted refactor to include a scope declaration: files touched, abstractions changed, new utilities added. Diffs that breach the declared scope are rejected before review, regardless of quality. We also maintain a ban on agentic flows for any task touching initialization or shared type boundaries until scope enforcement is automated.

When You’d Choose Differently

Teams with looser coupling, less shared abstraction, or shorter ownership horizons may tolerate agentic scope expansion. Startups optimizing for discovery over stability often find the overshoot cost worth the speed. We are optimizing for a production SaaS where implicit coupling makes scope breaches expensive.

Tool Crucible Rating

Overall: 3/5 Ease: 2/5 Value: 2/5 Support: 3/5

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This is part of our Agentic Coding Overshoot series. See full comparison: Agentic Coding Overshoot