OpenCode 1.18.6-1.18.9 fixes MCP compatibility and desktop stability
SST
Across four releases from July 27-28, 2026 (v1.18.6 through v1.18.9), OpenCode restored compatibility with legacy MCP SDK clients, fixed MCP servers failing to reconnect after expired SDK sessions (including under concurrent requests), honored configured MCP OAuth callback ports in mcp debug, and fixed several desktop-app issues including branch-specific repository cache corruption and a Solid.js cleanup crash breaking navigation.
Why it matters
The rapid cadence of MCP-compatibility fixes reflects churn as the broader MCP ecosystem adapts around the new spec landing the same week.
Importance: 1/5
Patch-level bugfix releases, no new features.