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codex-1m-context-window-setup

Configures and verifies an expanded, model-aware context window for OpenAI Codex CLI and Desktop. Use to inspect local context settings, lower or set the auto-compaction threshold, expand ~258K context to 500K or 1M, or repair model_context_window/model_auto_compact_token_limit. Not for changing the selected model or other Codex settings.

daymade-codex/codex-1m-context-window-setup/SKILL.md

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Nov 6, 2026
License
MIT

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# Codex 1m Context Window Setup

Inspect local settings or change only automatic compaction. For full context
expansion, read Codex's current model catalog, cap the request at the model's
declared maximum, and apply the bundled expansion preset.

## Route the request

| User intent | Action |
|---|---|
| Read the current base-config window or compaction threshold | Run `show`; no Codex process or model catalog needed |
| Lower/set only automatic compaction | Run `show`, then `set-compact --tokens N` |
| Explain 258K, diagnose model limits, or preview full expansion | Run `doctor` |
| Configure/fix/raise the context window | Run `apply` |