Straitjacket

Restrain your agents from shipping slop.

Get started · Read the docs · Browse the rules · GitHub

Straitjacket is a fast, deterministic scanner that looks for the weird stuff LLMs produce. It's one static Rust binary and works with projects written in any programming language.

curl -fsSL https://straitjacket.dev/install | sh

Or build from source with cargo install straitjacket.

Run straitjacket at the root of any project. It honors your .gitignore, prints one line per finding as path:line:col [rule] matched, and exits non-zero on any error — so CI fails the moment slop lands.

Nine of the eleven rules are on at the first run, so the strictest Straitjacket gets by default takes no configuration to reach. What you disagree with, you turn off — --skip for a run, straitjacket.toml for good, straitjacket-allow on the one line you meant. The other two you opt into: no-comments, which is severe enough to ask for, and test-quality, which downloads a grammar the first time it meets a test file.

$ straitjacket

src/theme.ts:42:7  [color]  #1e1e1e
src/icons/Logo.tsx:12:5  [inline-svg]  <svg
docs/setup.md:3:1  [emoji]  🚀
src/api/handlers.ts:1:1  [file-size]  2214 lines
src/worker.ts:88:31  [deep-nesting]  nesting depth 9

straitjacket: 5 error(s), 0 warning(s) across 128 file(s); 0 suppressed

Encode your taste as deterministic checks, and run them across everything an LLM writes.