Slack
Reads channel history and posts back into a channel — the answer arriving where the question was asked.
Most of what an organisation knows was said in a channel and never written down anywhere else. Reading history turns that into a source an agent can cite.
Posting is what makes an agent useful without anyone opening Ragenta: a nightly digest, an alert when a run finds something, an answer in the thread that asked. Posting is a separate permission from reading, and channel messages reach the model as untrusted text.