# Attachments

> [!TIP]
> `spec attach` registers files with a document and records their SHA-256. Small files stay in
> the repository; larger ones go to a store you configure.

## Commands

```console
$ spec attach <id> results.csv --write
$ spec files <id>
$ spec fetch <id>
```

## Stores

A store is a directory, or a command you already trust (rclone, aws, gsutil, wrangler). specfold
contains no network code and never handles credentials. `[files] inline_max_bytes` sets the
limit for the repository.

## Rules

- **P2**: every attachment is registered.
- **P3**: repository attachments stay small.
- **E1**: recorded attachments carry a matching hash.
- **E2**: stored attachments exist in the store.