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story-cover

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小说封面生成与提示词设计。根据书名、作者名和题材构建封面提示词；用户只要提示词时不生图，要求封面图时调用 GPT-Image-2，Codex CLI 优先使用内置 ImageGen。触发方式：/story-cover、/封面、「帮我做个封面」「生成封面图」「封面提示词」「封面设计」。

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Nov 8, 2026
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# story-cover：小说封面生成

根据书名和题材生成包含书名、笔名的完整封面，让读者一眼看出题材和氛围。

**仅提示词模式**：用户只要提示词，或 `story-publish` 选了仅提示词时，只做 Step 1-3，交付完整提示词，不需要生图工具、API Key 或输出目录；要封面图才继续 Step 4-6。由 `story-publish` 调用时，它传来的已确认书名、简介、笔名、平台和题材不再重问；结束时返回完整提示词原文，生图成功再附图片路径和质量检查结果，失败就说明原因。

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## 生成通路

- **Codex 内置（优先）**：当前 Codex CLI 会话可调用 `$imagegen` / `image_gen` 时，直接调用工具生成并保存，无需 `OPENAI_API_KEY` 或 `GPT_IMAGE_API_KEY`，不运行 `curl`。
- **API 回退**：仅在会话没有内置工具或用户明确指定 API 时使用，需要 `GPT_IMAGE_API_KEY`；环境变量和命令在 [references/api-fallback.md](references/api-fallback.md)，走这条通路时再读。工具缺失不等于 Codex 订阅不支持生图；内置调用失败时先报告错误，不静默切换到可能收费的 API。

## 生成流程
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