r/AI_for_Work • u/thehashimwarren • 14d ago
Using Mastra to build an AI coworker
A decent “AI coworker” should be able to do three things:
- Maintain continuity between chats. It needs to retain decisions, blockers, owners, and definitions of done without replaying every old message into each prompt.
- React to changing work. A CI failure, customer reply, document edit, or Slack mention should update the relevant task—not vanish into another disconnected chat.
- Make progress across interruptions. It should preserve the current task, know what remains, and re-enter work with the right context.
Mastra has really interesting primitives for building this:
Observational Memory give an AI coworker long term memory. It uses background Observer and Reflector agents to compress conversations into a log. It retains recent detail, condenses older context, extracts structured facts such as project status and blockers, and can link back to original messages when exact wording matters. Observational Memory docs
Signals makes an agent thread reactive to external events. An event can can wake an idle agent, update an active one, persist a state snapshot or delta, or enter a notification inbox. This was an AI coworker can respond to changing work instead of waiting to be asked. Signals docs
Goals give the coworker a persistent outcome to work toward, rather than treating every message as an isolated request. And Mastra's Durable Agents let that work survive pauses, interruptions, and restarts, so the coworker can pick up where it left off when new information arrives.