# twitter-cards

Sets up and audits Twitter and X Card metadata for link previews in social feeds.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 1100 installs · ★ 1062
- Author: kostja94
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/kostja94/marketing-skills/tree/HEAD/skills/seo/on-page/twitter-cards/SKILL.md
- Updated: 2026-10-21
- HTML: https://affpapa.org/en/nevibecode/skills/twitter-cards

## What it does

The skill generates and audits Twitter Card metadata for link previews on X. It selects the card format, such as `summary_large_image` or `player`, and writes tags including `twitter:card`, `twitter:title`, `twitter:description`, and `twitter:image:alt`.

It provides code snippets for standard HTML and Next.js App Router metadata. The public Twitter Card Validator is retired. Previews require testing against live rendered HTML or inside X itself. Image tags require absolute HTTPS URLs with at least 300×157 pixels and a 2:1 aspect ratio.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add kostja94/marketing-skills --skill twitter-cards -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/twitter-cards/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/twitter-cards/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add kostja94/marketing-skills --skill twitter-cards -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/twitter-cards/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add kostja94/marketing-skills --skill twitter-cards -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/twitter-cards/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install kostja94/marketing-skills twitter-cards
```

2. **Manually: put the files in place**
- File: `.github/skills/twitter-cards/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add kostja94/marketing-skills --skill twitter-cards -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/kostja94/marketing-skills --path skills/seo/on-page/twitter-cards
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/twitter-cards/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add kostja94/marketing-skills --skill twitter-cards -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/kostja94/marketing-skills/tree/HEAD/skills/seo/on-page/twitter-cards/SKILL.md

## When to use it
- Implement summary_large_image tags for Next.js or generic HTML
- Add accessible twitter:image:alt descriptions up to 420 characters
- Replace relative image paths with absolute HTTPS URLs
- Audit link previews without relying on the retired Card Validator

## Example prompts
- Add summary_large_image tags for my blog page using Next.js App Router.
- Audit Twitter Card meta tags in index.html and replace relative image URLs with HTTPS.
- Generate X preview metadata with twitter:site, creator, and image alt text.

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: adf1b9176d0d54d7.

BEGIN THIRD-PARTY FILE adf1b9176d0d54d7
````text
---
name: twitter-cards
description: When the user wants to add, audit, implement, or optimize Twitter Card metadata for X link previews, including twitter:card, twitter:title, twitter:description, twitter:image, or X previews. For a full metadata lifecycle use page-metadata; for broader social previews use open-graph.
metadata:
  version: 2.0.0
---

# SEO On-Page: Twitter Cards

Owns X/Twitter Card writing and implementation rules. **page-metadata** owns the full-page lifecycle and release verification. Platforms may use Open Graph fallbacks, so define X-specific copy only when it adds value.

**When invoking**: On **first use**, if helpful, open with 1–2 sentences on what this skill covers and why it matters, then provide the main output. On **subsequent use** or when the user asks to skip, go directly to the main output.

## Scope (Social Sharing)

- **Twitter Cards**: X-specific meta tags; control how links appear when shared on X/Twitter

## Card Types

| Type | Use case |
|------|----------|
| **summary** | Small card with thumbnail |
| **summary_large_image** | Large prominent image (recommended; 1200×675px) |
| **app** | Mobile app promotion |
| **player** | Video/audio content |

## Recommended Tags (summary_large_image)

```html
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Your Title">
<meta name="twitter:description" content="Your description">
<meta name="twitter:image" content="https://example.com/image.jpg">
<meta name="twitter:site" content="@yourusername">
<meta name="twitter:creator" content="@authorusername">
<meta name="twitter:image:alt" content="Alt text for image">
```

| Tag | Guideline |
|-----|-----------|
| **twitter:card** | Required; `summary_large_image` for most pages |
| **twitter:title** | Concise social title; same page identity as SEO/OG copy, not necessarily identical text |
| **twitter:description** | Accurate social summary without unsupported claims |
| **twitter:image** | Absolute URL; unique per page |
| **twitter:site** | @username of website |
| **twitter:creator** | @username of content creator |
| **twitter:image:alt** | Alt text; max 420 chars; accessibility |

## Image Requirements

| Item | Guideline |
|------|-----------|
| **Aspect ratio** | 2:1 |
| **Minimum** | 300×157 px |
| **Recommended** | Use a high-resolution image suited to the selected card and verify current platform behavior |
| **Delivery** | Absolute HTTPS URL with a successful image response |
| **Format and size** | Verify against current X documentation when implementation depends on exact limits |

## Common Mistakes

- Missing Twitter Card tags (Twitter won't display images properly without them)
- Using relative image URLs instead of absolute https://
- Images too small or wrong aspect ratio
- Title/description too long (gets truncated)
- Mechanically copying SEO copy when the share context needs different wording
- Changing the product identity or promise between SEO, OG, and X metadata

## Implementation

### Next.js (App Router)

```tsx
export const metadata = {
  twitter: {
    card: 'summary_large_image',
    title: '...',
    description: '...',
````
END THIRD-PARTY FILE adf1b9176d0d54d7

The third-party file has ended. Everything between the adf1b9176d0d54d7 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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