How to override the result of an GET request?

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I want to write an embedded Perl extension to replace the built in value of
..iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifDescr.* ==
..1.3.6.1.2.1.2.2.1.2 with my own values, such as the long description of the
interface instead of interface name.

I tried to register my own handler to .1.3.6.1.2.1.2.2.1.2 and make a
$request->setValue(ASN_OCTET_STR, $long_description); but the result is not
correct:
$ snmpget -v 1 -c system localhost .1.3.6.1.2.1.2.2.1.2.5
Error in packet
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: IF-MIB::ifDescr.5

Please give me a hint on this problem, thank you

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I want to write an embedded Perl extension to replace the built in value of .iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifDescr.* == .1.3.6.1.2.1.2.2.1.2 with my own values, such as the long description of the interface instead of interface name. 
 I tried to register my own handler to .1.3.6.1.2.1.2.2.1.2 and make a $request->setValue(ASN_OCTET_STR, $long_description); but the result is not correct: $ snmpget -v 1 -c system localhost .1.3.6.1.2.1.2.2.1.2.5 
Error in packet Reason: (noSuchName) There is no such variable name in this MIB. Failed object: IF-MIB::ifDescr.5 Please give me a hint on this problem, thank you 

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