generate_story

Generate a sequence of related images that tell a visual story or show a process

SERVERNano Banana SOURCEaeven-ai/mcp-nanobanana

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade B, identity unverified Pull the record →

This record as markdown: /tools/aeven-ai-mcp-nanobanana/generate-story.md

WHAT IT DOES

What generate_story does on Nano Banana

AI agents use generate_story to create or update resources in Nano Banana, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nano Banana environment.

RISK

Why generate_story is rated Medium

This tool creates and writes new image artifacts based on user prompts, making it a Write operation. It does not execute arbitrary code or shell commands (thus not Execute), does not delete or irreversibly remove data (not Destructive), and does not involve financial transactions (not Financial).

From the tool's definition Tool generates image sequences (creates new visual content) via natural language prompts through Gemini 2.5 Flash. The description states 'Generate a sequence of related images' indicating content creation/modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs generate_story safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Nano Banana, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For generate_story, this is the rule to start with:

generate_story Rate-limited

generate_story stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "generate_story": {
      "limits": [
        {
          "counter": "generate_story_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Nano Banana, apply this rule, and every generate_story call is checked against it from then on.

FAQ

Questions about generate_story

What does the generate_story tool do? +

Generate a sequence of related images that tell a visual story or show a process. It is categorised as a Write tool in the Nano Banana MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_story? +

Register the Nano Banana MCP server in PolicyLayer and add a rule for generate_story: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Nano Banana. Nothing to install.

What risk level is generate_story? +

generate_story is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit generate_story? +

Yes. Add a rate_limit block to the generate_story rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block generate_story completely? +

Set action: deny in the PolicyLayer policy for generate_story. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides generate_story? +

generate_story is provided by the Nano Banana MCP server (aeven-ai/mcp-nanobanana). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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