Dust looks interesting:

Feed your company context: Notion, Slack, GitHub, external websites (…) natively in minutes. Integrate anything via API.

To my mind, the #1 bottleneck in designing useful agents right now is understanding the user’s broader context and environment. Context is not as simple as a tapestry of API calls to Slack and Jira. True context evolves subtly over time, it learns with experience, it aggregates, synthesises and prioritises.

This is a whole layer of the stack still waiting to be built.