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video-thumbnail-generator

Create platform-ready thumbnails from real video frames. Use when the user wants a thumbnail, cover image, YouTube cover, Shorts cover, Bilibili cover, Xiaohongshu cover, or other video poster image.

AI 与智能体2.2ksrc/agent/skills/video-thumbnail-generator/SKILL.md

安装

把这段话发给 Claude Code、Codex 或 Cursor。智能体会先检查安全性,你确认后才安装。

读取 https://funcoding.ai/skills/0xsline/openchatcut/video-thumbnail-generator/install.md ,按里面的步骤帮我安装这个 Skill。

SKILL.md

Video Thumbnail Generator

Use this skill to create a high-clarity thumbnail or cover image from the actual video content.

Non-Negotiables

  1. Use the real video as visual evidence.

    • If the thumbnail shows a person, product, UI, frame, or scene from the video, extract or inspect real frames.
    • Never invent a generic software interface, fake product screen, or unrelated person.
  2. Read style references before recommending styles.

    • Use references/thumbnail-styles.md and references/thumbnail-style-recipes.md.
    • Only offer style directions supported by those references or by the user's explicit instruction.
  3. Keep text short and readable.

    • Usually 2-5 words.
    • Avoid thin type, low contrast, small labels, and clutter.

Workflow

  1. Confirm platform and aspect ratio if missing.
    • YouTube / Bilibili: usually 16:9.
    • Shorts / TikTok / Douyin: usually 9:16.
    • Xiaohongshu / WeChat Channels: usually 3:4.
    • Correct ambiguous ratio language gently, especially 4:3 vs 3:4.
  2. Read project state, transcript, and available media context.
  3. Inspect candidate frames:
    • expressive face
    • product or UI clearly visible
    • dramatic action moment
    • clean composition
    • strong lighting or clear subject separation
  4. Classify the thumbnail job:
    • talking-head / opinion / tutorial
    • product / software / demo
    • cinematic / documentary / art
    • entertainment / challenge / reaction
    • education / business / concept
  5. Propose concise title text options.
  6. Offer 3-6 clearly different style directions.
    • Each option should name the composition, not only a channel/style label.
    • Exclude weak options.
    • Wait for user choice when the direction is not obvious.
  7. Generate thumbnail options using selected real frames and the selected style.
  8. Check mobile readability, subject fidelity, product/UI truthfulness, and visual contrast.
  9. Present results and offer targeted adjustments.

Prompt Shape

[Platform] thumbnail, [aspect ratio / dimensions], [style name].

COMPOSITION: [subject position, scale, background, graphic balance]
REAL REFERENCE: [describe selected frame zone by zone]
TEXT: "[short title]" in [high-contrast style]
STYLE: [one-line style recipe from references]
CONSTRAINTS: readable at mobile size, no fake UI, no watermark, no play button.

References

  • references/thumbnail-styles.md: style library from real thumbnail analysis.
  • references/thumbnail-style-recipes.md: quick style recipes and prompt patterns.
  • references/field-testing-notes.md: known failure modes.

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