Want can give you this. 
use Want qw(want wantref);

# Time passes.
sub some_method {
    if (want('REF') and wantref() eq "OBJECT") {
        # We are in a chained method call
    }
    else {
        # We are not in a chained method call
    }
}

[download]
However I strongly agree with ikegami that the desire to complicate your API this way is a code smell suggesting that you're doing something very wrong somewhere.

In reply to Re: Determination of chained method call context by tilly
in thread Determination of chained method call context by Bloodnok

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