Solving Cascading Context Drift in Multi-Agent Claude Code

The article discusses the author's experience building a multi-agent system with 6 Claude Code instances and how they solved the issue of cascading context drift, where information gets lost during agent handoffs, leading to inconsistencies and failures.

Details

The author built a multi-agent system with 6 Claude Code instances running in parallel, but after 3 weeks, the system started falling apart due to cascading context drift. This is where one agent would forget what another had decided, and downstream agents would contradict upstream work, leading to 400 lines of conflicting output. To solve this, the author introduced the concept of a handoff contract - a short Markdown file with three sections: Decisions, Constraints, and Open Questions. This contract is read by the orchestrator before dispatching the next agent, and the contract text is included in the next agent's prompt. This forces agents to externalize their reasoning before terminating, preventing information from living only in agent memory. The author also developed a compressed PAX format to store the contract information efficiently, as with 6 agents running in parallel and each producing 3-5 handoffs per session, file size efficiency becomes important. The full orchestration system, including the handoff contract templates, PAX format spec, and orchestrator logic, is packaged as the Atlas Starter Kit, a ready-to-run multi-agent scaffold for Claude Code.