Problem
My agent keeps rewriting things that already work — why?
Because your agent can't see what your codebase already contains — so it rebuilds from scratch. CatWrangler surfaces the existing code and the decisions behind it before a line is written, so your agent extends what's there instead of duplicating it.
An agent starting cold has no memory of what's already been built. Left to itself, it assumes nothing exists and writes it again — quietly filling your codebase with duplicates.
Why it happens
A fresh agent doesn't know your codebase. It can't hold the whole thing in its head, and grepping around rarely turns up the function someone wrote last month — let alone the reasoning behind it. So when you ask for a feature, the safe-feeling move is to build it new. The result is two versions of the same thing, drifting apart over time.
CatWrangler closes that gap before any work starts. When an agent describes what it's about to do, the system surfaces the code and decisions that already do it — and points the agent at them. The most common reaction is an agent realizing its planned work was already finished, before writing a single line.
What changes with reuse-not-rebuild
- Your agent is shown matching code and the decisions behind it at intent time, not after the duplicate already exists
- It extends what's there instead of starting over, so the codebase stays coherent
- The reasoning travels with the code — your agent learns why it was built that way, not just that it exists
- Duplicate work gets caught up front, saving the rewrite and the cleanup later
“Without that gate I might have kept grepping forever and never learned the param exists.”
Related questions
Why doesn't my agent just search the codebase first?
It can, but searching only finds code that happens to match the words it guesses — it misses anything named differently, and it never surfaces the reasoning behind what's there. CatWrangler matches on intent, so the existing work shows up even when your agent wouldn't have thought to look for it.
Does this slow my agent down?
It speeds it up. Discovering that the work is already done — or that there's something to extend — happens before any code is written, which saves the build, the eventual duplicate cleanup, and the rewrite when the two versions drift apart.
Keep reading
Vibe-Engineering
Many agents. One codebase. Zero collisions.
Point your agents at CatWrangler and build — the discipline runs underneath.