# X_SOURCE_HEADER_OUT_OF_CONTRACT

## Means

a shipped source file's leading header is outside the 1–4 line responsibility contract

## Typical cause

the first paragraph is empty, carries no prose, or runs past four lines — the responsibility is buried or absent

## Fix

rewrite the leading header of the file the cause names as 1–4 lines of prose stating its single responsibility

[CLI and verify](/error-codes#cli-and-verify)