---
title: Configuration file
description: Where poly-crap finds .poly-crap.toml, how it merges with the command line, and an example.
---

Poly-crap looks for `.poly-crap.toml` in `--path`, then in each parent
directory, and uses the first one it finds. Unknown keys are an error, so a
typo cannot silently do nothing.

The command line wins over the file, and the file over the defaults, except
that `exclude` and `allow` lists are joined and a boolean is on when either
side sets it. [Options](/reference/options) names the key for each flag.

```toml .poly-crap.toml
languages = ["rust", "typescript", "python"]
threshold = 30.0
missing = "pessimistic"
fail-above = true
exclude = ["src/generated/**"]
allow = ["legacy::*", "vendor/**"]
sort = "file"
jobs = 4
```