Project Think: building the next generation of AI agents on Cloudflare

Cloudflare announces Project Think, the next generation of its Agents SDK, introducing a set of new primitives for building long-running, durable AI agents. Key features include durable execution with fibers (crash recovery and checkpointing), sub-agents with isolated SQLite storage and typed RPC, persistent tree-structured sessions with forking and full-text search, and sandboxed code execution via Dynamic Workers. The execution ladder spans five tiers from a durable workspace filesystem up to full OS sandbox access. On top of these primitives sits the Think base class, an opinionated harness that wires everything together for a complete chat agent with streaming, memory via context blocks, non-destructive compaction, and self-authored extensions that agents can write at runtime. The post frames this as the third wave of AI agents: durable, distributed, serverless infrastructure rather than laptop-bound tools.