Agents are transforming not only the application paradigm, but also the developer ecosystem. The full ecosystem chain — who creates, how to create, how to collaborate, and how value is distributed — will be redefined. Based on the speaker’s systematic research on the agentic software‑development paradigm and developer ecosystems, this talk introduces the Five‑Layer Model of Developer Ecosystem put forward by Singularity Research . It explores in depth how Agents reshape developer boundaries, software supply modes, and the relationships between platforms and developers, re‑defining the brand‑new Agentic Developer Ecosystem for the agentic era.