OpenCode v1.15.0: Effect-Based Event System and Background Subagents
SST
OpenCode v1.15.0 introduces an Effect-based core event system for more complete event delivery across sessions and integrations. The preceding v1.14.51 shipped experimental background subagents, allowing tasks to continue running while the user keeps working in the foreground, plus NVIDIA billing header support and LiteLLM v1.85+ requirement.
Why it matters
Background subagents are a significant ergonomic step for long-running coding tasks, decoupling agent execution from the active session. The Effect-based event system improves reliability for integrations relying on session event streams.
Importance: 2/5
Notable feature (background subagents) in a rapidly iterating open-source coding agent
Sources
official
Release v1.15.0 — sst/opencode
official
Release v1.14.51 — sst/opencode