EARLY BETA

Claude Code builds.
You stay in control.

Open-source proxy that sits between Claude Code and the Anthropic API. Logs every request. Enforces your rules.

$ curl -fsSL https://luthien.cc/install.sh | bash
Paste in terminal · ~2 min setup time
For Linux & macOS
how it works
without luthien
Without Luthien: Claude Code ignores your CLAUDE.md rules and you correct it manually

Claude ignores your CLAUDE.md rule and you correct it manually.

with luthien
With Luthien: Luthien catches the violation and auto-corrects

Luthien catches the violation and auto-corrects. No human intervention needed.

problem

Claude Code does weird and lazy stuff sometimes.

architecture
🧑‍💻 You ⇔ 💻 Claude Code ⇔ Luthien ⇔ ☁️ Anthropic API
                            |
                     logs every request and response.   ~5-15ms
                     you can configure rules/policies to
                     modify or block certain responses or requests:
                            |
                            |-- did it do what I asked?
                            |-- did it follow CLAUDE.md?
                            +-- did it do something suspicious?

Luthien can call a separate model to check whether each response follows your rules. Runs alongside normal requests, adding almost no delay.

When Claude Code compacts or starts a new session, Luthien still remembers. Your rules stay enforced from first prompt to last.

How to set up a custom policy
early feedback

"I saw the website and immediately thought, 'I want that.' I have to correct the pip install thing multiple times per day. You see pip and you're like, I already gave you permissions for uv. But it blocks on that permission and you lose hours of work. Awesome job, guys, it's like CLAUDE.md that actually works."

Nicolás Mesa
Nicolás Mesa
Cofounder & CTO @ Veleiro AI | Ex-Amazon | Ex-Meta
get started

Up and running in minutes.

step 01
Install

Works with your existing Claude Code setup.

~2 mins
step 02
Configure your rules

Define what Claude is and isn't allowed to do.

~5 mins
step 03
Let Claude build

Luthien runs in the background. Your rules get enforced.

~from now on
View on GitHub Book a setup call
$ curl -fsSL https://luthien.cc/install.sh | bash
Paste in terminal · ~2 min setup time
For Linux & macOS