Custom token

Hi

One of my modules calls module_invoke_all(hook, my_op, context) when an activity occurs, which leads to add an activity record successfully. Here I've used hook_activity_info() and token module hooks.

How I can send some data (in my case it is number of user points gained for the activity) with module_invoke_all() as it replaces a token. Now the token appears in the message templates creation page, under my own section, but I have trouble in passing a value to the token.

I tried with a context parameter element but failed.

Please help.