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OpenCode
Reviewed on 2026-03-21 from ../happy-adjacent/research/opencode at commit
2e0d5d230893dbddcefb35a02f53ff2e7a58e5d0.
Why it matters
OpenCode is currently the strongest overall product reference for Happy.
- the desktop UI is excellent
- the feature set feels coherent and ambitious
- clicking the context field opens a genuinely useful debug/context inspector
- the transcript and sync model look much closer to what Happy should want than a flat custom message stream
Current take
- Use OpenCode as the leading reference for transcript design.
- Strongly consider adopting its message-and-parts direction instead of inventing another bespoke message protocol.
- Keep digging into how it syncs state between client and server; there is a lot to learn there.
- Read
runtime-tracing.mdfirst if you want the real story. That file now has concrete permission, media, subtask, and routing flows with actual payload snippets from a source-run OpenCode server.
Key findings
- transcript model: stable message envelopes with ordered typed parts
- live updates: incremental SSE-style event stream plus paged fetch hydration
- subagents: child sessions created through the
tasktool, resumable bytask_id - task tracking: first-class todo store, not buried in message text
- permissions: first-class request objects plus pattern rules and decision history
- sandbox: workspace/worktree isolation, not a strict OS sandbox
Important repo files
../happy-adjacent/research/opencode/packages/opencode/src/session/message-v2.ts../happy-adjacent/research/opencode/packages/opencode/src/session/index.ts../happy-adjacent/research/opencode/packages/opencode/src/tool/task.ts../happy-adjacent/research/opencode/packages/opencode/src/tool/todo.ts../happy-adjacent/research/opencode/packages/opencode/src/permission/index.ts../happy-adjacent/research/opencode/packages/opencode/src/control-plane/workspace-server/routes.ts../happy-adjacent/research/opencode/packages/app/src/components/session/session-context-tab.tsx
See docs/competition/opencode/message-protocol.md,
docs/competition/opencode/runtime-tracing.md, and
docs/competition/opencode/sources.md.