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Use when the user asks about Codex Rules behavior, injected project rules, supported rule file locations, matching, or environment configuration.
Passed 22 of 22 test cases with the skill, and 10 of 22 without it.
and 13 more in the full report
13 fixed10 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.
We maintain custom rules under `.claude`. Which directory pattern relative to the root does Codex Rules recognize for Claude rules?
| Checked | Without skill | With skill |
|---|---|---|
| The response identifies .claude/rules/**/*.md as a supported path. | Missed | Passed |
The instructions your model reads when the skill loads.
Codex Rules is automatic once the plugin is enabled. It injects:
SessionStart and UserPromptSubmitapply_patch by defaultDynamic PostToolUse output is injected as additional context and is deduplicated per plugin data session. Codex Rules does not rewrite tool output.
Supported project sources:
CONTEXT.md.omo/rules/**/*.md.claude/rules/**/*.md.cursor/rules/**/*.md.github/instructions/**/*.md.github/copilot-instructions.mdSupported environment knobs:
CODEX_RULES_DISABLED=1CODEX_RULES_MODE=both|static|dynamic|offCODEX_RULES_MAX_RULE_CHARS=<number>CODEX_RULES_MAX_RESULT_CHARS=<number>CODEX_RULES_ENABLED_SOURCES=CONTEXT.md,.omo/rulesThe legacy PI_RULES_* variables are accepted as fallbacks for users migrating from pi-rules.
test cases passed, vs 10 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.