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 tang-vu/social-posting-skills --skill image-generationgit clone --depth 1 https://github.com/tang-vu/social-posting-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/tang-vu/social-posting-skills/image-generation)<a href="https://agentmods.dev/skills/tang-vu/social-posting-skills/image-generation"><img src="https://agentmods.dev/badge/skills/tang-vu/social-posting-skills/image-generation/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/tang-vu/social-posting-skills/image-generation"><img src="https://agentmods.dev/badge/skills/tang-vu/social-posting-skills/image-generation.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 | $0.00011 | $0.01017 |
| Opus 5 | $0.00005 | $0.00508 |
| Sonnet 5 | $0.00002 | $0.00203 |
| Haiku 4.5 | $0.00001 | $0.00102 |
Grade A, and why
image-generation 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 11d 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 — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Image Generation Skill
You are an expert at creating social media images using AI image generation tools. Your job is to create platform-appropriate visuals that stop the scroll and support the post content.
Platform Image Specifications
| Platform | Recommended Size | Aspect Ratio | Max File Size | Format |
|---|---|---|---|---|
| 1200x628 | 1.91:1 | 20 MB | PNG, JPG | |
| 1200x627 | 1.91:1 | 10 MB | PNG, JPG | |
| 1200x630 | 1.91:1 | 8 MB | PNG, JPG | |
| Threads | 1080x1080 | 1:1 | 8 MB | PNG, JPG |
| X (Twitter) | 1200x675 | 16:9 | 5 MB | PNG, JPG |
| Product Hunt | 1270x760 | 5:3 | 2 MB | PNG, JPG |
| Dev.to | 1000x420 | ~2.38:1 | 10 MB | PNG, JPG |
| Bluesky | 1200x675 | 16:9 | 1 MB | PNG, JPG |
| Substack | 1100x220 (banner) | 5:1 | 5 MB | PNG, JPG |
| Medium | 1400x788 | 16:9 | 10 MB | PNG, JPG |
Hacker News and IndieHackers do not support inline images in posts.
Image Types
1. Hero / Cover Image
- Used for: Dev.to cover, Medium cover, Substack header, blog link previews
- Style: Clean, professional, readable at small sizes
- Include: Title text overlay, brand colors, simple illustration
2. Social Share Card
- Used for: X, LinkedIn, Facebook, Reddit link posts
- Style: Open Graph preview image
- Include: Title, author, brand mark
3. Content Image
- Used for: Inline images in long-form content
- Style: Screenshots, diagrams, charts, code snippets
- Include: Relevant visual that adds to the content
4. Engagement Image
- Used for: Threads, Bluesky, X standalone posts
- Style: Eye-catching, meme-style, or infographic
- Include: Key stat, quote, or visual hook
Prompt Engineering for Social Images
General Prompt Template
{Style}: {Subject}, {Context}, {Visual elements}.
Clean design, {color palette}, suitable for social media post.
No text overlay needed.
Style Keywords That Work Well
- Tech/SaaS: "flat illustration", "isometric design", "minimalist vector"
- Professional: "corporate photography style", "clean gradient"
- Creative: "vibrant colors", "geometric patterns", "abstract art"
- Developer: "dark theme code editor", "terminal screenshot", "architecture diagram"
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.
- 11d ago First seen · 116 lines · 11 tokens per session scan A 91883c0501d2
image-generation is a skill published in the GitHub repository tang-vu/social-posting-skills (9 stars, last pushed 6mo ago), licensed MIT. It adds 11 tokens to every session and 1,017 once invoked, about $0.0001 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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