Shared selective persistent memory lifts task completion to 96% and cuts per-call token cost 97x.

This method retains four categories of reusable context (task specs, data schemas, tool configs, output constraints) while discarding session-specific reasoning, enabling role-based workspace transfer across users (arXiv:2607.09493). It reports 96% completion versus 79% without memory, 14x faster zero-token refresh for recurring updates, and 97x lower per-invocation token cost versus injecting raw data each time. This is the concrete blueprint for what "agent memory" should actually persist. Not chat history. The reusable scaffolding.