The message 1 is invalid: * The subject must start with a verb in imperative mood, but it started with: "Copyright". Whether the word is in imperative mood is determined by whitelisting. The general whitelist is available at https://github.com/mristin/opinionated-commit-message/blob/master/src/mostFrequentEnglishVerbs.ts. You can whitelist additional verbs using "additional-verbs" input to your GitHub action (currently no additional verbs were thus specified). Moreover, you can also whitelist additional verbs in a file given as "path-to-additional-verbs" input to your GitHub action (currently the file is: src/AdditionalVerbsInImperativeMood.txt). Please check the whitelist and either change the first word of the subject or whitelist the verb. The original message was: Copyright headers Added a neutral copyright to .cs files.