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.
npx skills add mickpletcher/AI-Skills --skill github-social-previewgit clone --depth 1 https://github.com/mickpletcher/AI-SkillsWrote 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.
[](https://agentmods.dev/skills/mickpletcher/ai-skills/github-social-preview)<a href="https://agentmods.dev/skills/mickpletcher/ai-skills/github-social-preview"><img src="https://agentmods.dev/badge/skills/mickpletcher/ai-skills/github-social-preview/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.
<a href="https://agentmods.dev/skills/mickpletcher/ai-skills/github-social-preview"><img src="https://agentmods.dev/badge/skills/mickpletcher/ai-skills/github-social-preview.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00074 | $0.02174 |
| Opus 5.5 | $0.00030 | $0.00870 |
| Sonnet 5.5 | $0.00015 | $0.00435 |
| Haiku 4.5 | $0.00007 | $0.00217 |
Grade A, and why
github-social-preview 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 1mo ago.
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.
How it starts
The opening of the file, as written. The whole thing — 237 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GitHub Social Preview Skill
Intent
Generate branded GitHub social preview images using repo metadata, visual rules, and the included preview generator.
Do Not Use When
- Do not use for unrelated image generation, manual graphic design requests, or previews without enough repo identity context.
- Required context is missing and cannot be reasonably inferred.
- A more specific skill in this repo is a better match.
Constraints
- Do not fabricate missing facts, measurements, dates, sources, or user context.
- Keep output aligned with Mick's direct, practical communication style unless the skill says otherwise.
- Preserve safety, legal, medical, financial, and operational boundaries stated in this file.
- Prefer concise, usable output over broad explanation.
Validation Checklist
- The output matches the skill's intended task and platform.
- Required inputs, assumptions, and uncertainty are explicit.
- Safety, scope, and source limits are respected.
- The response follows the requested format or the skill's default output format.
- The result is practical enough to use without another cleanup pass.
Generate a clean, professional 1280x640 social preview image for any GitHub repository and export it as a JPG under 1 MB.
Primary Triggers
Use this skill when the user starts with gsp, or asks to create a social preview or Open Graph image for a GitHub repository.
gsp <repo_url>
generate github social preview <repo_url>
create repo preview image <repo_url>
make social preview for <repo_url>
og image for <repo_url>
Expected Inputs
- A GitHub repository URL (required)
- Optionally: a custom tagline, theme preset, accent color, layout hint, logo, screenshot, or background art
Expected Outputs
- File:
github-social-preview.jpg - Size: exactly 1280x640 pixels
- Format: JPEG
- File size: under 1 MB (auto-recompressed if needed)
Workflow
Step 1 — Fetch repository metadata
What ships with it
7 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.
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.
- 1mo ago First seen · 237 lines · 74 tokens per session scan A e14fddb2789d
github-social-preview is a skill published in the GitHub repository mickpletcher/AI-Skills (20 stars, last pushed yesterday), licensed MIT. It adds 74 tokens to every session and 2,174 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-08-30.
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