Codex CLI Integration Skill (v2.37)

Model family: gpt-5.3-codex with three reasoning tiers
Reasoning tiers: medium (default), high, xhigh (maximum)
Profiles: Pre-configured profiles for each reasoning level
Backward compatible: Still supports model override via -m flag

v2.89 Key Changes (GPT-5.3-CODEX FAMILY)

Reasoning Tier Selection:

Tier	Model	Use Case	Command
`medium`	`gpt-5.3-codex`	Default, fast code tasks	`codex exec "prompt"`
`high`	`gpt-5.3-codex-high`	Complex analysis, security	`codex exec --profile high "prompt"`
`xhigh`	`gpt-5.3-codex-xhigh`	Architecture, critical review	`codex exec --profile xhigh "prompt"`

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