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 novoads/agent-skills --skill nano-banana-image-adgit clone --depth 1 https://github.com/novoads/agent-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/novoads/agent-skills/nano-banana-image-ad)<a href="https://agentmods.dev/skills/novoads/agent-skills/nano-banana-image-ad"><img src="https://agentmods.dev/badge/skills/novoads/agent-skills/nano-banana-image-ad/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/novoads/agent-skills/nano-banana-image-ad"><img src="https://agentmods.dev/badge/skills/novoads/agent-skills/nano-banana-image-ad.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 4 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Tool Misuse · line 46 Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).Fix: Validate all tool parameters against an allowlist. Reject dangerous parameter values (shell=True, --force, -rf /) and use safe defaults.
- high Privilege Escalation · line 172 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
- medium Data Exfiltration · line 140 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Agent Snooping · line 236 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00140 | $0.04827 |
| Opus 5 | $0.00070 | $0.02413 |
| Sonnet 5 | $0.00028 | $0.00965 |
| Haiku 4.5 | $0.00014 | $0.00483 |
Grade A, and why
nano-banana-image-ad scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sS -X POST "$NOVOADS_BASE_URL/v1/estimates" \ How it starts
The opening of the file, as written. The whole thing — 247 lines — stays where its author put it; the contents beside it link to each section on GitHub.
nano-banana-image-ad
Generate one or more standalone Meta ad image creatives via Novoads' POST /v1/images
with model: "nano-banana-pro". Hands the image paths off to your Meta-ad-builder skill —
this skill does not upload to Meta itself.
If the shared/ files are not on disk
Then this skill was installed on its own from skills.sh and the rest of the pack stayed behind.
Fetch each missing file from https://raw.githubusercontent.com/novoads/agent-skills/main/<path>,
where <path> is one of shared/skills/image-ad-prompting/OVERVIEW.md,
shared/skills/image-ad-prompting/prompting/prompt-library.md,
shared/skills/image-ad-prompting/prompting/safety-suffixes.md and
shared/skills/nano-banana-image-ad/prompting/guide.md. Or take everything at once with
git clone https://github.com/novoads/agent-skills.git. That install has no
scripts/check-novoads-env.sh either, so set NOVOADS_API_KEY in the environment yourself and
let the first call report the key.
Read order
Paths below are from the repo root. This skill is copied into .claude/skills/ and
.cursor/skills/ by sync-skill.sh, so a relative link out of it would break in those
copies — read these from the repo you are working in.
- This file — endpoint, auth, upload flow, workflow phases.
shared/skills/image-ad-prompting/OVERVIEW.md— the ecosystem hub: which skill, which model, what the family does and doesn't do.shared/skills/nano-banana-image-ad/prompting/guide.md— model-specific prompting (what Nano Banana Pro is good/bad at, when to switch to gpt-image-2).shared/skills/image-ad-prompting/prompting/prompt-library.md— 40 validated templates with per-model notes.shared/skills/image-ad-prompting/prompting/safety-suffixes.md— the 3 always-on guards.skills/nano-banana-image-ad/scripts/generate_image.py— the helper script (Python stdlib only).
For anything about the API itself that this file does not answer — error codes, rate limits,
concurrency, the upload contract — the novoads-api skill's reference.md is the authority.
What ships with it
3 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.
- today Changed 9174f9c29051
- 12d ago First seen · 247 lines · 140 tokens per session scan A 6dc944774c23
nano-banana-image-ad is a skill published in the GitHub repository novoads/agent-skills (15 stars, last pushed yesterday), licensed MIT. It adds 140 tokens to every session and 4,827 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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