Learn the tone, meaning, and better English alternatives around "won't be necessary" with real scene examples.

It means the speaker is saying they trust the person and do not think further action is needed.
From I Think My Wife Wants To Kill Me S2, Episode 51
The speaker tells a detective that an explanation is unnecessary and vouches for someone.
Use this in a formal or semi-formal situation when you want to defend someone to an authority figure. It sounds confident and slightly stiff.
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