Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add Mikefluff/skills/plugin install mikefluff-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/mikefluff/skills/banner-maker)<a href="https://agentmods.dev/skills/mikefluff/skills/banner-maker"><img src="https://agentmods.dev/badge/skills/mikefluff/skills/banner-maker.svg" alt="Measured on agentmods" 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 | $0.00086 | $0.02322 |
| Opus 5 | $0.00043 | $0.01161 |
| Sonnet 5 | $0.00017 | $0.00464 |
| Haiku 4.5 | $0.00009 | $0.00232 |
Grade A, and why
banner-maker 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 6d 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 — 189 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Distinct from flyer-maker:
- Smaller aspect ratios (mostly horizontal, often extreme like 728×90 or 1456×180)
- Dense text + CTA conventions (ad copy, not editorial)
- Per-preset standard sizes (no custom aspects in v1)
- "Ad feel" aesthetic — direct, conversion-focused, brand-loud
Distinct from cover-maker / thumbnail-maker:
- No artist / author / title-as-subject
- Standard ad-platform sizes (presets, not "medium")
- Includes explicit CTA element
- Very small visual zones in some presets (300×250 has ~80% text)
This skill does NOT:
- Generate animated banners (HTML5 / GIF) — static PNGs only
- A/B test variants for click-through — generate options, you measure
- Place actual brand logo file in pixel-perfect position — model approximates; for exact placement use a vector design tool
- Match exact platform ad-creative spec (file size, character limits) — that's downstream QA
ROLE
Read headline + CTA + brand + style + presets → pick text-strong model → assemble per-preset prompts with composition zones (headline / subhead / CTA / brand mark zone) → batch execute → save PNGs.
PIPELINE
-
Resolve content:
- Required:
--headline "<text>"(the dominant text — 3-7 words ideal) - Required:
--cta "<text>"(e.g., "Start free trial", "Learn more", "Get the demo") - Strongly recommended:
--brand "<name>" - Optional:
--subhead "<text>",--logo <path-or-url>
- Required:
-
Resolve presets — multi-preset batch:
--presets og,linkedin-ad,leaderboard— comma list (defaultog,linkedin-ad)- Available presets:
og— 1200×630 (OG image / Twitter card preview / blog header)linkedin-ad— 1200×627 (LinkedIn Sponsored Content)facebook-ad— 1200×628 (Facebook News Feed ad)twitter-card— 1500×500 (Twitter profile header / large card)leaderboard— 1456×180 (Google Display 728×90 scaled 2× for retina)medium-rectangle— 600×500 (Google Display 300×250 scaled 2×)mobile-banner— 640×200 (Google Display 320×100 scaled 2×)wide-skyscraper— 320×1200 (Google Display 160×600 scaled 2×)
What ships with it
6 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.
- 6d ago First seen · 189 lines · 86 tokens per session scan A 9d9a19c82a39
banner-maker is a skill published in the GitHub repository Mikefluff/skills (19 stars, last pushed 28d ago), licensed MIT. It adds 86 tokens to every session and 2,322 once invoked, about $0.0004 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 2026-08-30.
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