morluto/generate-social-preview

A reusable agent skill for creating social preview images grounded in what a repository actually does. It reads the project, shapes concise copy, and produces a card that stays readable at thumbnail size.

Use it for GitHub repository previews, package pages, launch posts, and link cards for skills, libraries, developer tools, SaaS products, and other projects. It supports new images, revisions, palette variants, and adapting a supplied style reference.

Install for Cursor, Claude Code, Codex, GitHub Copilot, Gemini CLI, Cline, Windsurf, Amp, and other supported agents with the Skills CLI:

npx skills add morluto/generate-social-preview

In Claude Code, you can use the plugin marketplace for the skill's slash command and update management:

/plugin marketplace add morluto/generate-social-preview
/plugin install generate-social-preview@generate-social-preview

After installation, invoke /generate-social-preview:generate-social-preview. For automatic updates, open /plugin, select the marketplace under Marketplaces, and choose Enable auto-update. Choose one installation method per agent to avoid duplicate copies.

The Skills CLI requires Node.js and npm. Select your agent in the installer, or pass --agent claude-code, for example. Add --global for a user-wide installation.

In Codex, install through its native plugin marketplace:

codex features enable plugins
codex plugin marketplace add morluto/generate-social-preview
codex plugin add generate-social-preview@generate-social-preview

Start a new Codex session after installation and invoke $generate-social-preview:generate-social-preview.

Use whatever image-generation and editing tools are available in your agent. The skill works with the host's tools, APIs, CLIs, or installed image skills. Use image viewing to inspect references and results. If generation is unavailable, the agent can still prepare the copy, reference choices, and a generation prompt.

The optional normalization helper needs Bash and either macOS sips or ImageMagick's magick command.

Open the repository you want to feature and ask your agent:

Use the generate-social-preview skill to create a GitHub social preview for this repository.

You can provide a direction or constrain a revision:

Use the generate-social-preview skill with a Swiss technical direction and a warm paper palette.

Use the generate-social-preview skill to revise this card. Change only the tagline;
keep the product name, palette, and illustration unchanged.

By default, the skill produces one candidate, checks the copy and composition, and saves a versioned image without overwriting an existing asset. GitHub previews are normalized to a 1280×640 PNG after visual inspection.

Ground the imagery in the project, then choose the composition.

1. Find relevant material. Follow image links in the README and docs, and inspect screenshots, illustrations, demos, example outputs, and brand assets in the repository.
2. Use what fits. Pass useful images to the generator as project references, drawing on recognizable details, outputs, or brand cues. Existing material earns its place by helping communicate the project.
3. Develop an idea when needed. If existing images do not fit, build a visual idea from the project's purpose, examples, or domain. A skill, library, and SaaS product may each call for a different approach.

Project references inform what the preview shows; style references inform how it looks. The composition can be a single image, typography, an interface, or a sequence when the steps help explain the project.

The bundled style guide offers retro editorial, Swiss technical, terminal collage, and diagrammatic print as starting points. Choose what best communicates the project: typography, a symbol, an illustration, an interface, an output, or a sequence when useful.

These are examples from specific projects:

Open SaaS: retro editorial	REA: analysis artifacts and a sequence

Credit to Vince Canger (@vincanger) for the Open SaaS artwork used as the retro editorial reference, shared in his original post, How I promoted my open source repo to 6k stars in 6 months.

The second reference was used for REA. Its workflow composition fits that example; each project's preview should use the composition that serves its own message.

bash path/to/generate-social-preview/scripts/normalize-preview.sh \
  candidate.png social-preview-v1.png

Replace path/to/generate-social-preview with the installed skill directory (skills/generate-social-preview/ in this repository). The helper accepts an approximately 2:1 source, writes a 1280×640 PNG, and refuses to overwrite an existing output. It does not generate images or check their visual quality.

• SKILL.md — workflow, copy guidance, and visual checks.
• .claude-plugin/ — Claude Code plugin and marketplace manifests.
• .codex-plugin/ — Codex plugin manifest.
• .agents/plugins/marketplace.json — Codex marketplace catalog.
• agents/openai.yaml — optional Codex display metadata.
• references/style-directions.md — art direction guidance.
• references/examples.md — project examples and attribution.
• skills/generate-social-preview/assets/style-references/ — labeled visual references.
• scripts/normalize-preview.sh — image normalization helper.