Stacks/Agent platform / infrastructure

Cloudflare Project Think / Agents SDK

Cloudflare's Project Think extends the Agents SDK for what the authors call the third wave of agents: durable, serverless infrastructure rather than a laptop process. The post details fibers for crash recovery, isolated sub-agents with their own SQLite, persistent forkable sessions, and sandboxed code execution on Dynamic Workers. They say the Agents SDK is already powering thousands of production agents; Think shipped in preview.

Use case

Cloudflare's platform and Agents SDK for building long-running, durable, serverless agents, described as already powering thousands of production agents, with Project Think adding the next set of primitives

Category

Agent platform / infrastructure

Team size

not stated

Orchestrator / framework

Project Think is a set of Agents SDK primitives plus an opinionated Think base class: durable execution with fibers (crash recovery, checkpointing, automatic keepalive); sub-agents as isolated child agents with their own SQLite and typed RPC; persistent sessions (tree-structured messages, forking, compaction, full-text search); sandboxed code execution via Dynamic Workers; and an execution ladder from workspace and isolate up through npm, browser, and sandbox.

Memory

Persistent sessions with tree-structured messages, forking, compaction, and full-text search. Sub-agents get their own SQLite. Durable Objects provide durable, addressable agent identity.

Evals

not stated

Observability

not stated

Monthly cost

not stated

Models

not stated

Observability tools

not stated

Other tools

Dynamic WorkersSQLiteWebSocket protocol shared with @cloudflare/ai-chat

Source

https://blog.cloudflare.com/project-think/

Sunil Pai and Kate Reznykova · Apr 14, 2026