Summary
Cognition's legacy Cascade agent reached end-of-life on July 1, 2026, completing the transition of Windsurf into Devin Desktop that began with the June 2 rebrand and Windsurf 2.0's Agent Command Center. Devin Local, a from-scratch Rust rewrite of Cascade that Cognition says is up to 30% more token-efficient, is now the default local coding agent, and Devin Desktop runs any agent over the open Agent Client Protocol.
What changed
Cascade support ended July 1, 2026. Devin Local (a from-scratch Rust rewrite, up to 30% more token-efficient, with subagent support) replaced it as the default local agent as of June 2, and Devin Desktop adopted the open Agent Client Protocol (ACP) so it can natively run Claude Agent, Codex, OpenCode, and other ACP-compatible agents. This builds on Windsurf 2.0's earlier move to a Kanban-style Agent Command Center, cloud agents, and task Spaces. Legacy .windsurfrules files still work alongside a new .devin/ directory.
Why it matters
The EOL closes the Windsurf brand about a year after Cognition's acquisition and standardizes on an open editor-agent protocol. ACP positions Devin Desktop as an agent-neutral IDE shell rather than a single-vendor tool, while the Rust rewrite of the core local agent targets the token efficiency that long agentic sessions demand.
Evidence excerpt
Cascade is EOL July 1, 2026... Devin Local is up to 30% more token efficient and supports modern features like subagents.