DD-04 — Codex CLI: The Production Rust Harness
Codex CLI: The Production Rust Harness
The only production Rust harness. Single binary, memory-safe, Apache 2.0.
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Rust gives Codex properties no TS/Python harness has: memory safety, single-binary deployment, no GC pauses. Same score as OpenCode (34/60) — but a completely different profile: language-level correctness vs architecture-level.
Rubric Score
34/60 (= OpenCode; language-level vs architecture-level tradeoff)
After This Module
01
Apply the 6-phase methodology to Codex CLI; produce a scored card.
02
Defend Rust as a load-bearing language choice, not incidental.
03
Contrast Codex's language-level bet (Rust type system) with OpenCode's architecture-level bet (client/server) — same score, different profile.
04
Identify the tradeoffs Rust buys and the costs it imposes.
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