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 feiskyer/codex-settings --skill nanobanana-skillgit clone --depth 1 https://github.com/feiskyer/codex-settingsWrote 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/feiskyer/codex-settings/nanobanana-skill)<a href="https://agentmods.dev/skills/feiskyer/codex-settings/nanobanana-skill"><img src="https://agentmods.dev/badge/skills/feiskyer/codex-settings/nanobanana-skill/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/feiskyer/codex-settings/nanobanana-skill"><img src="https://agentmods.dev/badge/skills/feiskyer/codex-settings/nanobanana-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
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 →
- medium Rogue Agent · line 79 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00107 | $0.02179 |
| Opus 5 | $0.00053 | $0.01090 |
| Sonnet 5 | $0.00021 | $0.00436 |
| Haiku 4.5 | $0.00011 | $0.00218 |
Grade A, and why
nanobanana-skill 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 9d 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 — 241 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Nanobanana Image Skill
Use the bundled nanobanana.py tool to generate or edit images with Gemini image models. The default path now targets Nano Banana 2 (gemini-3.1-flash-image-preview) and turns on thinking summaries plus Google Search grounding by default, because those defaults are the main reason to use this skill instead of a generic image prompt.
When to use this skill
Use it for:
- Creating a new image from text
- Editing or remixing one or more existing images
- Combining several reference images into one composition
- Requests where factual freshness matters and image grounding should use live web data
- Requests that need strong text rendering, layout reasoning, or more deliberate composition
Do not use it for:
- Non-image tasks
- Image work that explicitly must use another provider or another installed image skill
Requirements
GEMINI_API_KEYmust exist in~/.nanobanana.envor the shell environment.- Python dependencies from
requirements.txtmust be installed. - The executable is the
nanobanana.pyfile in this same skill directory. Resolve its absolute path once before running it.
The CLI can display --help without credentials. It validates local input files before creating an API client and exits non-zero when the API returns no image.
Example env file:
GEMINI_API_KEY=sk-dummy
Default behavior
Unless the user explicitly asks otherwise, prefer these defaults:
- Model:
gemini-3.1-flash-image-preview - Search grounding: enabled
- Thinking summaries: enabled
- Thinking level:
high - Resolution:
1K - Aspect ratio: leave unspecified unless the user clearly wants a shape
Leaving aspect ratio unspecified is usually better for edits because Gemini can match the input image shape. For text-only generation, pick an aspect ratio only when the user implies a format such as poster, square post, banner, phone wallpaper, or ultrawide hero image.
Workflow
1. Clarify only the missing constraints
What ships with it
4 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.
- 9d ago First seen · 241 lines · 107 tokens per session scan A 0b4870a685e1
nanobanana-skill is a skill published in the GitHub repository feiskyer/codex-settings (236 stars, last pushed 26d ago), licensed MIT. It adds 107 tokens to every session and 2,179 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 2026-08-30.
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