2026-09-21-eve-breaking-capability-moves-persistent-subagents-by-default-one-workflow-sessions-workflow

Breaking capability moves: persistent subagents by default, one-workflow sessions, workflow-only background tools. Durable human pauses became a tool-level primitive (ask() inside a workflow tool), subagents remember by default, and the execution model changed under running sessions.

Channel: tagged-release. Half: capability. Date: 2026-08-26 to 2026-09-19.

Operator consequence: Do not roll back across 0.57.0 with live sessions. If you need data minimization, 0.53.1 retention 0 is the first knob that deletes workflow payloads at run end. Answers the contract’s primitive-stability question: sessions, subagents, and background tools were all still breaking in September; watch-only as architecture precedent.

Receipt

• https://github.com/vercel/eve/releases/tag/eve%400.57.0