ZwischenProduction-grade AI code.
Not slop.
Claude Code does the minimum that looks right. Reads less than it should, skips verification, and stops when the output looks plausible – not when the work is done. Zwischen makes it do the work.
Zwischen’s adversarial AI reviewer. The reason your agent can’t cut corners.
Your agent doesn’t write bad code on purpose. It compute-optimizes – takes the cheapest path to a plausible-looking result. That means reading less code than it should, thinking through fewer scenarios, guessing at things it could look up, and stopping the moment the output looks done. That’s vibe code. Not reckless, just cheap.
Frank is a second AI running inside your Claude Code session. He sees what the agent reads, changes, skips, and is about to do next. If the move is easy instead of correct, he blocks it – and the agent is forced to do the work.
If Claude Code feels like it’s getting lazier, you’re not imagining it. AMD’s Senior AI Director analyzed 6,852 sessions and 234,760 tool calls across three months of real engineering work. Claude read 70% fewer files before making changes. One in three edits went into files the agent hadn’t even opened. The agent’s own self-assessment: “That was lazy and wrong.”
The playbook never changes:
Before the tool call runs. Before the write lands. Before you lose the afternoon cleaning it up.
A second AI inside Claude Code with one job: block the easy move before it executes. If the agent tries to ship something that only looks right, Frank sends it back.
Frank sits inside your Claude Code session – not after it. He runs on the model you pick: GPT, Gemini, DeepSeek, or Claude. Every tool call, every file write, every next step gets checked before it executes. Cheap move? Blocked. The agent is forced to go back and do it right.
Agents are fast. But the output lands faster than your team can verify it – and your engineers end up babysitting: rereading files the agent should have read, tracing assumptions it never checked. Frank catches the lazy move during the session, before it reaches your team.
Zwischen comes from zwischenzug – the chess “in-between move” that disrupts the expected line. Insert the unexpected challenge at the moment it matters.
Stop shipping vibe code.
If your team is building real products with Claude Code that have to work in production, leave your email. We’ll reach out when a spot opens up.