Codex Implementation

Drive the OpenAI Codex CLI as a code-changing agent from scripts or an agent harness. The contract: explicit scope, explicit acceptance criteria, explicit verification, explicit output format — then verify the diff yourself.

Command surface verified against codex-cli 0.142.5; on flag errors, recheck codex --help and codex exec --help — placement and availability shift between versions.

When to use

• Bulk or mechanical implementation with a clear spec (migrations, refactors, well-defined features)
• Work explicitly routed to gpt-5.6 / Codex by the user or a model-routing policy
• Parallel implementation lanes where Codex handles one branch of work

Not for: tasks needing your own conversation context Codex can't see (write a self-contained prompt instead), or taste-critical UI/copy work unless the routing policy sends it there.

Preflight