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Codex
Reviewed on 2026-03-20 from ../happy-adjacent/research/codex at commit
ec32866c379405a28b58c0064c857fb60ed3c735.
Why it matters
Codex is the strongest backend protocol reference in this set.
- typed app-server contract
- explicit
thread,turn, anditemmodel - approvals are server requests, not ad hoc message events
- sandbox policy is much richer than OpenCode's
- resume, fork, and live replay are clearly first-class concerns
Current take
- If Happy wants a server-side session protocol, Codex is the best reference.
- If Happy wants a UI/session transcript shape, OpenCode still feels stronger.
- The best outcome may be OpenCode-like transcript state with Codex-like approval and runtime semantics.
Important repo files
../happy-adjacent/research/codex/codex-rs/app-server/README.md../happy-adjacent/research/codex/codex-rs/app-server-protocol/src/protocol/v2.rs../happy-adjacent/research/codex/codex-rs/app-server/src/lib.rs../happy-adjacent/research/codex/codex-rs/app-server/src/transport.rs../happy-adjacent/research/codex/codex-rs/app-server/src/thread_state.rs../happy-adjacent/research/codex/codex-rs/app-server/src/codex_message_processor.rs
See docs/competition/codex/message-protocol.md and
docs/competition/codex/sources.md.