Agent skill

Cover Gen

社交媒体封面生成 + 视频首帧插入。从视频成片提取关键帧，按各平台规格 AI 生成封面，最终将封面作为视频第一帧（0.1秒）合成到视频中。底层使用 mediagen (Gemini/OpenAI) + FFmpeg。

No licenceAuto-check passedMedia & Creative

Install Cover Gen

skills CLI

$ npx skills add npc-live/clawfirm --skill cover-gen -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install npc-live/clawfirm cover-gen --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/npc-live/clawfirm.git skills-src && mkdir -p .claude/skills && cp -r skills-src/app/assets/skills/video-skills/cover-gen .claude/skills/cover-gen && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "cover-gen" agent skill from https://github.com/npc-live/clawfirm/tree/main/app/assets/skills/video-skills/cover-gen into .claude/skills/cover-gen/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cover-gen", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/npc-live/clawfirm/tree/main/app/assets/skills/video-skills/cover-gen

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add npc-live/clawfirm --skill cover-gen -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install npc-live/clawfirm cover-gen --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/npc-live/clawfirm.git skills-src && mkdir -p .agents/skills && cp -r skills-src/app/assets/skills/video-skills/cover-gen .agents/skills/cover-gen && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "cover-gen" agent skill from https://github.com/npc-live/clawfirm/tree/main/app/assets/skills/video-skills/cover-gen into .agents/skills/cover-gen/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cover-gen", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add npc-live/clawfirm --skill cover-gen -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install npc-live/clawfirm cover-gen --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/npc-live/clawfirm.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/app/assets/skills/video-skills/cover-gen .cursor/skills/cover-gen && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "cover-gen" agent skill from https://github.com/npc-live/clawfirm/tree/main/app/assets/skills/video-skills/cover-gen into .cursor/skills/cover-gen/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cover-gen", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/npc-live/clawfirm.git --path app/assets/skills/video-skills/cover-gen

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add npc-live/clawfirm --skill cover-gen -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install npc-live/clawfirm cover-gen --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/npc-live/clawfirm.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/app/assets/skills/video-skills/cover-gen .gemini/skills/cover-gen && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "cover-gen" agent skill from https://github.com/npc-live/clawfirm/tree/main/app/assets/skills/video-skills/cover-gen into .gemini/skills/cover-gen/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cover-gen", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install npc-live/clawfirm cover-gen

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add npc-live/clawfirm --skill cover-gen -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/npc-live/clawfirm.git skills-src && mkdir -p .github/skills && cp -r skills-src/app/assets/skills/video-skills/cover-gen .github/skills/cover-gen && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "cover-gen" agent skill from https://github.com/npc-live/clawfirm/tree/main/app/assets/skills/video-skills/cover-gen into .github/skills/cover-gen/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cover-gen", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add npc-live/clawfirm --skill cover-gen -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install npc-live/clawfirm cover-gen --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/npc-live/clawfirm.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/app/assets/skills/video-skills/cover-gen .opencode/skills/cover-gen && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "cover-gen" agent skill from https://github.com/npc-live/clawfirm/tree/main/app/assets/skills/video-skills/cover-gen into .opencode/skills/cover-gen/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cover-gen", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: cover-gen
GitHub stars: 156
Token cost: ~2.3k tokens
SKILL.md length: 251 words
Files: 1
Skills in repo: 49
Repo updated: Jun 17, 2026
First seen: Oct 7, 2026
Licence: None found

At a glance

Works in 4 steps: 提取视频信息 + 关键帧 → 平台封面规格 → AI 生成封面 → …
Tasks that involve Video production
SKILL.md covers 功能, 工作流概览, Step 1: 提取视频信息 + 关键帧 and Step 2: 平台封面规格, plus 5 more sections
Calls ffmpeg and ffprobe

What it does

Cover Gen is an agent skill from npc-live/clawfirm. 社交媒体封面生成 + 视频首帧插入。从视频成片提取关键帧，按各平台规格 AI 生成封面，最终将封面作为视频第一帧（0.1秒）合成到视频中。底层使用 mediagen (Gemini/OpenAI) + FFmpeg。触发词：封面、cover、生成封面、封面制作、首帧、cover gen、thumbnail、视频封面。

Its SKILL.md is about 2.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Media & Creative, covering Video production. It works with FFmpeg and OpenAI.

When your agent uses it

Tasks that involve Video production

Example prompts

“/cover-gen”

Workflow steps

4 steps, taken from the step headings in SKILL.md.

提取视频信息 + 关键帧
平台封面规格
AI 生成封面
封面合成到视频第一帧 (0.1s)

What it can do on your machine

Read from SKILL.md and the folder at commit db435ed. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- ffmpeg
- ffprobe
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Cover Gen loads about 2.3k tokens when it runs. Until then it costs about 43 tokens; SKILL.md has 251 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~43
When it runs · the whole SKILL.md, loaded when a task matches: ~2.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 251 words (~2,331 tokens).

name: cover-gen

Outline of SKILL.md

封面生成 + 视频首帧插入
功能
工作流概览
Step 1: 提取视频信息 + 关键帧
Step 2: 平台封面规格
Step 3: AI 生成封面
推荐模型
封面 prompt 模板
Step 4: 封面合成到视频第一帧 (0.1s)
完整 ffmpeg 命令
简化版（原视频已是 H.264/yuv420p 时）
带音频处理的版本
关键参数说明
与上下游对接
上游（视频来源）
下游（发布渠道）
Pipeline 集成
与 daily-content.whip 对接
与 media.whip (抖音爆款) 对接
多平台批量封面 + 首帧示例
注意事项

Read the full SKILL.md on GitHub

Files

Just SKILL.md in app/assets/skills/video-skills/cover-gen of npc-live/clawfirm.

Open the folder on GitHubat commit db435ed

Compare with similar skills

Cover Gen next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Cover Gen compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Cover Gen this skillnpc-live/clawfirm	156	—	~2.3k	Automated safety check: Pass	None	3 mo ago
Super Video MakerBomx/super-video-maker-skill	309	—	~11k	Automated safety check: Notes	None	2 mo ago
Vlog Auto Editznyupup/ai-video-editing-skill	148	—	~6.8k	Automated safety check: Pass	MIT	5 mo ago
Cloud Screencastoratis/LISA	176	—	~3.1k	Automated safety check: Warn	MIT	yesterday
Cassette ModelCassette-Editor/oh-my-cassette	158	1 repos	~374	Automated safety check: Pass	MIT	4 days ago
Render Chatgpt Chatgooseworks-ai/goose-skills	1.2k	—	~2.3k	Automated safety check: Pass	MIT	yesterday

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Works with

Questions about Cover Gen

What does Cover Gen do?

社交媒体封面生成 + 视频首帧插入。从视频成片提取关键帧，按各平台规格 AI 生成封面，最终将封面作为视频第一帧（0.1秒）合成到视频中。底层使用 mediagen (Gemini/OpenAI) + FFmpeg。. Cover Gen is an agent skill from npc-live/clawfirm.

When should I use Cover Gen?

Cover Gen fits situations like: tasks that involve Video production.

How do I install Cover Gen in Claude Code?

Run `npx skills add npc-live/clawfirm --skill cover-gen -a claude-code`. Or copy the skill folder (app/assets/skills/video-skills/cover-gen in npc-live/clawfirm) into .claude/skills/cover-gen in your project. Claude Code loads it when a task matches its description.

How do I install Cover Gen in Codex?

Run `npx skills add npc-live/clawfirm --skill cover-gen -a codex`. Or copy the skill folder (app/assets/skills/video-skills/cover-gen in npc-live/clawfirm) into .agents/skills/cover-gen in your project. Codex loads it when a task matches its description.

Can I use Cover Gen in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add npc-live/clawfirm --skill cover-gen -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cover-gen, .gemini/skills/cover-gen, .github/skills/cover-gen and .opencode/skills/cover-gen in your project.

What does Cover Gen need to run?

Going by SKILL.md and its folder, Cover Gen needs the command-line tools its instructions call (ffmpeg and ffprobe).

Does Cover Gen access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Cover Gen safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Cover Gen use?

No licence was found for Cover Gen or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Cover Gen use?

About 2.3k tokens (SKILL.md is roughly 9.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Cover Gen?

Skills that share tags, products or a category with Cover Gen: Super Video Maker (Bomx/super-video-maker-skill, 309 stars), Vlog Auto Edit (znyupup/ai-video-editing-skill, 148 stars), Cloud Screencast (oratis/LISA, 176 stars) and Cassette Model (Cassette-Editor/oh-my-cassette, 158 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Cover Gen?

npc-live (a GitHub organization) maintains it in npc-live/clawfirm, which has 156 GitHub stars. The repository holds 49 skills in this directory. The repository was last updated on June 17, 2026.

Source: npc-live/clawfirm on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Cover Gen

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

More from npc-live/clawfirm

Related

Questions about Cover Gen