Oct Codex Usage Tips

First check where quota is being spent: trim AGENTS.md, narrow the scope that triggers Skills, and read fewer unrelated documents.

Divide work by task: the main Agent handles requirements and architecture, while sub-Agents or small models handle execution.

Connect a function-level code-locating MCP such as Serena so you don't have to read the entire file each time; the bigger the project, the more noticeable the difference.

Auto-review can replace full-access: it only reviews out-of-bounds actions, so you don't need to manually approve every step.

Computer Use can be installed separately for use by other Agents, and called only when screen viewing and clicking are needed.

Keep an eye on official adjustments to default speed, context length, and reset rules, and update your quota plan accordingly at any time.

Prompt caching requires an exactly identical prefix; changing the opening instructions, switching models, or compressing context will all invalidate the cache.

Stating in AGENTS.md not to add complexity for extremely rare edge cases can reduce Codex's over-defensive code.