file_starts_with

Byte-level prefix / suffix check. Works on any bytes (binary safe, unlike file_header).

- id: generated-sentinel
  kind: file_ends_with
  paths: "build/**/*.generated.md"
  suffix: "<!-- generated by alint -->\n"
  level: error

Check-only: a fix would risk silently duplicating a near-matching prefix. Pair with file_prepend / file_append explicitly if you want auto-repair.

See also

• file_ends_with