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Rule "hyphen in 'opt in/out'"

This is one of many errors that LanguageTool can detect.

Description: hyphen in 'opt in/out'
Message: When '\1-\2' is used as a modifier, it is usually spelled with a hyphen.
Category: Grammar (ID: GRAMMAR)
Link: https://languagetool.org/insights/post/hyphen/#compound-adjectives-with-hyphens
Incorrect sentences
that this rule can detect:
  • We have many new opt in newsletter subscribers.
    Correction suggestion: opt-in
Correct sentences
for comparison:
  • My attempt to opt out failed.
ID: OPT_IN_HYPHEN [2]
Version: 6.6-SNAPSHOT (2024-11-24 22:33:09 +0100)