Replacing extend commands in snmpd.conf with a subagent

Forgive me if my question isn't entirely coherent because I am not
fully understanding what I'm asking. I have tried asking this question
in the -coders mailing list, but it has occurred to me that perhaps
that was the wrong venue for it.

Right now I have in my snmpd.conf a bunch of extend commands of the form

    extend $oid $name $command --args $oid

where $command is a C program we've written that fetches the value
associated to $oid.

For performance reasons, we would like to replace this with a
subagent. As I understand from the wiki, this means I should write a
MIB module which I can then turn into a subagent with the AgentX
protocol... however, I'm confused as to how to write the MIB module. I
already have code that turns the OID into its value; I would like to
simply extract that code from my tool and integrate it into net-snmp
instead.

What guidance can you offer me on how to do this?

Thanks,
- Jordi G. H.

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