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model-challenge

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Use when a user requests an independent Codex or Gemini review of uncommitted code, a branch diff, or a specific commit. Don't use for unconfirmed or unattended review sends, or source mutation.

.devin/skills/model-challenge/SKILL.md

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Sep 28, 2026
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# Second opinion external review

## Contract

| Field | Bound contract |
|---|---|
| Trigger | User requests an independent Codex or Gemini review of uncommitted code, a branch diff, or a specific commit, optionally focused on security, performance, or error handling. |
| Authority | Remote: sends the selected code diff and project guidance to Codex and/or Gemini (paid API); requires explicit human invocation. Previews the target and consequence before credentials, data-at-rest changes, paid actions, publishing, deployment, remote bulk mutation, or irreversible deletion. |
| Side effect | Sends the selected code diff and optional project guidance to Codex and/or Gemini. Codex is read-only sandboxed. Gemini headless invocation may auto-approve extension tool calls and therefore requires explicit user-authorized invocation. |
| Done | The chosen external reviewer runs on the complete selected diff or is explicitly reported unavailable. Findings include exact locations and confidence where supported. Multiple-reviewer agreements and disagreements are summarized. Empty or oversized scopes are handled before invocation. |

## Inputs

1. Code diff or commit reference (required): uncommitted changes, a branch diff, or a specific commit SHA.