Here's a thread that lets you post a message to a chat in graph-store:
post-msg.hoon
/- spider/+ *strandio, *graph-store, *resource=, strand=strand:spider=>|%++ make-post|= [our=ship now=@da res=resource msg=@t]^- cage::=/ =post *post=: author.post ourindex.post ~[now]time-sent.post nowcontents.post ~[[%text msg]]==:::- %graph-update!> ^- update:+ %0 now:+ %add-nodes res%- ~(gas by *(map index node))~[[~[now] [post ~[%empty]]]]--^- thread:spider|= arg=vase=/ m (strand ,vase)=/ uarg !< (unit (pair resource @t)) arg?~ uarg(strand-fail %no-arg ~)=/ res p.u.uarg=/ msg q.u.uarg^- form:m;< our=@p bind:m get-our;< now=@da bind:m get-time;< ~ bind:m (poke [our %graph-push-hook] (make-post our now res msg))(pure:m !>(~))
Save it in /ted of the %base desk, |commit %base, and run it like:
-post-msg [~zod %foo-9955] 'some message'
(obviously change the channel name to whatever you have)
Analysis
Pretty simple, just use on-poke with an argument of [ship term] cage where term is the agent and cage is whatever the particular agent expects.