compose_images · Gemini 2 5 Flash Image MCP: Risk & Policy

WHAT IT DOES

What compose_images does on Gemini 2 5 Flash Image MCP

AI agents invoke compose_images to trigger actions in Gemini 2 5 Flash Image MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why compose_images needs a policy

This tool triggers an external generative AI operation (Google Gemini) to process multiple input images and produce a new composed image. It is not a simple read/write of existing data but an execution of a generative model pipeline with side effects including optional file saving. The blast radius is medium as misuse could produce harmful imagery or consume API resources, but it does not destroy data or move money.

From the tool's definition Compose a new image using multiple input images and a guiding prompt

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

compose_images Rate-limited

compose_images stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "compose_images": {
      "limits": [
        {
          "counter": "compose_images_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Gemini 2 5 Flash Image MCP, so you can run agents against it safely.

FAQ

Questions about compose_images

What does the compose_images tool do? +

Compose a new image using multiple input images and a guiding prompt. It is categorised as a Execute tool in the Gemini 2 5 Flash Image MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on compose_images? +

Register the Gemini 2 5 Flash Image MCP server in PolicyLayer and add a rule for compose_images: 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 Gemini 2 5 Flash Image MCP. Nothing to install.

What risk level is compose_images? +

compose_images is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit compose_images? +

Yes. Add a rate_limit block to the compose_images 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 compose_images completely? +

Set action: deny in the PolicyLayer policy for compose_images. 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 compose_images? +

compose_images is provided by the Gemini 2 5 Flash Image MCP server (nanameru/gemini-2.5-flash-image-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.