Brutally Honest Translation
You're being cc'd for liability reasons. The decision is already made.
Credit & visibility
“I'll loop you in”
You are about to be included on something so that you cannot later say you were excluded, not because your input is wanted.
How it gets used
Common when a decision has already been made. Being looped in is frequently a courtesy applied after the fact.
Three ways to answer “I'll loop you in”
Supreme Court Polite
I will copy you on the thread so you remain informed of developments as they occur.
Passive-Aggressive Retaliation
Adding you now so you have full visibility, no need to weigh in unless you feel strongly!
Paste the whole message instead
Phrases rarely arrive alone. Run the full email through the decrypter to see all three translations together and get an evasion score for the message as a whole.
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