Slack Engineering explains how they manage context across long-running, multi-agent security investigations, using a Director's Journal, Critic's Review, and Critic's Timeline instead of accumulating raw message history.

Slack's Security Engineering team deployed a multi-persona agent system — Director, Expert, and Critic agents working together — that performed over 7,500 security investigations and 500,000 tool calls in its first quarter, with structured outputs reducing hallucinations.
