markdown-style Very Good Software

markdown-style checks Markdown against a fixed set of conventions. The main one is a sentence per line, which keeps a diff to the sentences that actually changed rather than reflowing a whole paragraph. The rest is ordinary tidiness: consistent heading and list markers, no trailing whitespace, predictable blank lines. There is no configuration. You point it at a file, it tells you what is off and why, and it can fix most of it for you.