A tool for designing a GitHub social-preview card, also called an Open Graph image, at 1280 by 640 pixels. This is the image shown when a repository link is shared on many websites.

Use it to create a repository cover, README hero, link card, or og:image. It gathers repository metadata, rewrites the description, selects an editorial mood, and produces a self-contained HTML design.

It provides a repeatable way to turn repository facts into a designed README or link-preview image. It also sets a defined format and several visual styles.

repo-cover — Skill for Claude Code by sjh9714

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add sjh9714/cover-my-repo --skill repo-cover

Clone the repo

git clone --depth 1 https://github.com/sjh9714/cover-my-repo

Made for: Claude Code.

Or install repo-cover, the plugin that ships this one along with the rest of its 1 skill.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sjh9714/cover-my-repo/repo-cover/github.svg)](https://agentmods.dev/skills/sjh9714/cover-my-repo/repo-cover)

Your own site

<a href="https://agentmods.dev/skills/sjh9714/cover-my-repo/repo-cover"><img src="https://agentmods.dev/badge/skills/sjh9714/cover-my-repo/repo-cover/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/sjh9714/cover-my-repo/repo-cover"><img src="https://agentmods.dev/badge/skills/sjh9714/cover-my-repo/repo-cover.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 90 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,111 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00090	$0.01111
Opus 5	$0.00045	$0.00556
Sonnet 5	$0.00018	$0.00222
Haiku 4.5	$0.00009	$0.00111

Measured 12d ago against content hash d5aab065c75c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

repo-cover scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/check_card.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/repo-cover/SKILL.md · 83 lines

How it starts

The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.

repo-cover

You design one 1280x640 social-preview card as a single self-contained HTML file. You write the HTML yourself. There is no image model and no build step. Quality comes from following the numbers below exactly.

Workflow

Gather facts. Gather the owner, name, description, primary language, license (use the spdx_id). Prefer gh api repos/<owner>/<name> or the local checkout. Never invent a star count or license.
Rewrite the description. The card line is not the GitHub description verbatim. Compress it to one or two sentences, max 110 characters with a 60-character maximum for CJK, concrete nouns, and no marketing adjectives. Show the user your line before rendering if they are present; in a non-interactive run, proceed and include the line in your report.
Pick a mood. Default editorial. Offer the other four only if the user asks for options. Read exactly ONE mood reference and ONE example from this list.
- references/mood-editorial.md + assets/examples/editorial-red-handed.html
- references/mood-poster.md + assets/examples/poster-archify.html
- references/mood-blueprint.md + assets/examples/blueprint-macos-harness.html
- references/mood-gallery.md + assets/examples/gallery-cumora.html
- references/mood-terminal.md + assets/examples/terminal-freeze.html Do not read renderer-free files "for context". Two files, then write. For a README hero banner instead of a card, read references/banner.md (1280x320, editorial language).
Write <repo>-cover.html. Copy the example's skeleton, replace content, apply the mood's rules. If the description or repo name contains CJK text, also read references/cjk.md first.
Check. Run python3 scripts/check_card.py <file>. Fix every FAIL, re-run, stop after two repair rounds and report remaining failures honestly.
Export. Follow references/export.md for the PNG and where to upload it (GitHub Settings → Social preview). If the user wants the card to update itself, point them to the bundled GitHub Action.

Read the full file on GitHub · 83 lines

Files

What ships with it

36 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

12d ago First seen · 83 lines · 90 tokens per session scan A d5aab065c75c

Subscribe to this mod's changes

repo-cover is a skill published in the GitHub repository sjh9714/cover-my-repo (7 stars, last pushed 20d ago), licensed MIT. It adds 90 tokens to every session and 1,111 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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repo-cover

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

repo-cover

Workflow

What ships with it

What this file has done since we first saw it

Other skills, from other repositories

pixel2motion

regional-culture-poster

archify

ip-as-logo

beautify-github-readme

tastemaker