What is gemini-nano-banana-mcp CLAUDE.md?

Project instructions for an MCP server that uses Google Gemini Nano Banana models to generate images. MCP is a standard way for an agent to call tools provided by another program.

Use it when developing, testing, or maintaining this Gemini-based image-generation MCP server.

It gives developers the commands, code structure, testing rules, and security requirements needed to work on the image-generation server. The excerpt does not describe the server's individual image tools.

How kevinkiklee/gemini-nano-banana-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to kevinkiklee/gemini-nano-banana-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/kevinkiklee/gemini-nano-banana-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/kevinkiklee/gemini-nano-banana-mcp

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/kevinkiklee/gemini-nano-banana-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/kevinkiklee/gemini-nano-banana-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/kevinkiklee/gemini-nano-banana-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/kevinkiklee/gemini-nano-banana-mcp/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/kevinkiklee/gemini-nano-banana-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/kevinkiklee/gemini-nano-banana-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 922 This file is loaded in full into every session.

When invoked 922 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00922	$0.00922
Opus 5.5	$0.00369	$0.00369
Sonnet 5.5	$0.00184	$0.00184
Haiku 4.5	$0.00092	$0.00092

Measured 2mo ago against content hash ce735c154cd8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gemini-nano-banana-mcp CLAUDE.md 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 2mo 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.

CLAUDE.md · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

gemini-nano-banana-mcp

Global MCP server for image generation using Google Gemini Nano Banana models.

Commands

pnpm build — Compile TypeScript to dist/
pnpm dev — Run stdio transport directly with tsx (development)
pnpm dev:http — Run HTTP transport directly with tsx (development)
pnpm serve — Run HTTP transport from compiled dist/ (production)
pnpm test — Run tests with Vitest
pnpm test:watch — Run tests in watch mode

Conventions

All source files must be under 150 lines. If a file approaches the limit, split it into focused modules.

Architecture

Shared libraries in src/, server entry points in src/server/:

src/utils.ts — File/path utilities (slugify, sanitize, expand, unique filepath)
src/secret-patterns.ts — SECRET_PATTERNS constant (~28 regexes)
src/security.ts — scanForSecrets, RateLimiter class
src/sanitize.ts — quarantineModelText (untrusted model output) and safeErrorMessage (error-message allowlist for MCP tool output)
src/gemini.ts — MODEL_MAP, MODEL_KEYS, callGemini wrapper, lazy client singleton, resetClient
src/gemini-retry.ts — isTransientError, isOverloaded, backoffDelayMs, MAX_ATTEMPTS (retry primitives)
src/gemini-types.ts — Gemini API type definitions (options, result, response shapes, GeminiClient)
src/server/server.ts — log(), Zod schema, ToolResult type, createMcpServer() factory
src/server/handler.ts — handleGenerateImage() pure tool handler
src/server/index.ts — Stdio entry point (local / Claude Code)
src/server/http.ts — HTTP server setup, auth gate (timing-safe), main entry
src/server/http-routes.ts — MCP POST/GET/DELETE route handlers
src/server/http-helpers.ts — Session registry (with TTL), readBody (1MB limit), json helper
src/server/lifecycle.ts — Session reaper, graceful shutdown

Tests are colocated per module: utils.test.ts, security.test.ts, sanitize.test.ts, gemini.test.ts, server/server.test.ts, server/http.test.ts.

Read the full file on GitHub · 65 lines

Changes

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.

2mo ago First seen · 65 lines · 922 tokens per session scan A ce735c154cd8

Subscribe to this mod's changes

gemini-nano-banana-mcp CLAUDE.md is an instructions file published in the GitHub repository kevinkiklee/gemini-nano-banana-mcp (0 stars, last pushed 4mo ago), licensed MIT. It adds 922 tokens to every session, about $0.0037 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 2026-08-31.

Building agents Creative and media

gemini-nano-banana-mcp CLAUDE.md next to 6 instructions from other repositories
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gemini-nano-banana-mcp: Instructions file for Claude Code