Cross-Framework Thread Persistence and Session Layer for Agent Chat UIs
CopilotKit, the agent frontend stack at 34,700 stars, carries multi-year, high-comment issues about the same missing layer: thread reloading broken with LangGraph, message history unsupported for Mastra, and direct AG-UI integration requested by multiple users. Every team shipping an agent UI rebuilds session persistence per framework. A storage and resumption layer that works across agent runtimes is the most-requested absent piece of the stack.
Problem Statement
A team shipping an agent chat product on CopilotKit and LangGraph today finds thread reloading broken, per a 28-comment open bug, and Mastra users find history simply unsupported, per a 28-comment feature request open for over a year. Each team writes custom checkpoint storage, message replay, and resumption logic per runtime, and the result is fragile state divergence between the UI and the agent's actual memory.
The Idea
A session and thread persistence service for teams building agent UIs who need durable, resumable conversations across LangGraph, Mastra, and custom runtimes without writing storage glue per framework.
Why Now
Agent UIs moved from demos to products in 2025-2026, and production products need conversations that survive reloads, device switches, and weeks of history. The AG-UI protocol standardized the wire format between agents and UIs but deliberately left persistence out of scope, which is exactly why CopilotKit's tracker fills with thread-history requests across every framework adapter.
Target User
Frontend and platform engineers building production agent chat interfaces
Target Market
Agent application infrastructure
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