Support a Codex-native mode that can use the current Codex session as the LLM runner

[lihqi]

Problem Statement

First of all, thank you for open-sourcing Open Code Review and for adding Codex skill/plugin support. The project is very useful, especially the deterministic diff handling and structured review workflow.

I would like to use Open Code Review from inside Codex via the installed skill/plugin. Today, the Codex integration invokes the local ocr CLI, and ocr still requires a separately configured LLM endpoint/API key. For users who already have a Codex subscription or token allowance, this means the Codex integration cannot use their existing Codex quota and requires another provider setup or extra API billing.

This is a bit confusing from a user perspective because the workflow is launched inside Codex, but the actual model calls are still managed outside Codex.

Proposed Solution

It would be great to have a Codex-native mode for the Codex integration.

Possible shape:

• A documented mode such as ocr review --audience agent --llm-runner codex, or a dedicated Codex skill/plugin path.
• In this mode, Open Code Review could keep the deterministic parts of the pipeline, such as diff/file selection, grouping, rules, and output formatting.
• The LLM judgment/review step would be delegated to the current Codex session, so users can use their existing Codex quota instead of configuring OCR_LLM_URL / OCR_LLM_TOKEN.

If direct access to the Codex model runner is not technically possible, another helpful option might be to expose an ocr command that only prepares the deterministic review context as JSON/Markdown. The Codex skill could then ask Codex itself to perform the review from that context.

Alternatives Considered

Current workarounds I found:

• Configure a separate OpenAI/Anthropic/OpenAI-compatible endpoint for ocr.
• Use a local model through Ollama/LM Studio.
• Use Codex's native code review without Open Code Review.

These work, but they either require extra provider setup/cost, or they lose the Open Code Review pipeline that makes this project valuable.

Affected Area

Review Agent / LLM interaction

Additional Context

Related docs/PRs I looked at:

• The README says the Codex plugin registers a skill that runs ocr review --audience agent.
• PR feat(codex): add local Codex plugin support #69 notes that the Codex integration does not make Codex the internal LLM runner for OCR.

I completely understand there may be product/API limitations here. Even a short documentation note explaining the limitation and recommended Codex-native workaround would be very helpful. Thanks again for the great project!

[lizhengfeng101]

Thanks for the detailed and thoughtful suggestion!

We currently already support reusing Claude Code's model endpoint configuration from environment variables, so when OCR runs inside Claude Code it can leverage the existing setup instead of requiring a separate provider.

We'll look into whether we can do the same for Codex's model endpoint configuration. Appreciate the input!