Cloudflare has announced Project Think, an experimental suite of primitives for its Agents SDK that shifts AI agents from stateless request-response orchestration to a durable, actor-based infrastructure. The core innovation is Fibers — durable invocations that checkpoint their own instruction pointer using ctx.stash() and a co-located SQLite database, allowing agents to survive platform restarts and resume mid-execution rather than replaying from the last snapshot. Additional features include Dynamic Workers (restricted V8 isolates) for secure agent-generated code execution, a Session API that stores conversations as relational trees with parent_id branching for parallel reasoning paths, and editable Context Blocks for persistent, model-managed system prompt sections. Project Think is positioned as an alternative to snapshot-based approaches used by Google ADK and AWS Bedrock AgentCore.
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