AI agents use download_image to create or update resources in Mcp Search Images — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Search Images environment.
Downloading an image writes a file to the local filesystem. It is reversible (the file can be deleted), so it falls under Write rather than Destructive. The blast radius is medium since it could be used to download unwanted or malicious content to the local system, but it does not directly delete or modify existing data.
From the tool's definition Tool name 'download_image' and description '下载图片' (download image)
Documented attack patterns abuse exactly the kind of access download_image gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Search Images, and nothing reaches the server without passing your rules. This is the rule we recommend for download_image:
{
"version": "1",
"default": "deny",
"tools": {
"download_image": {
"limits": [
{
"counter": "download_image_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}download_image 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.
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下载图片. It is categorised as a Write tool in the Mcp Search Images MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Search Images MCP server in PolicyLayer and add a rule for download_image: 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 Mcp Search Images. Nothing to install.
download_image is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the download_image 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.
Set action: deny in the PolicyLayer policy for download_image. 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.
download_image is provided by the Mcp Search Images MCP server (yanjunz/mcp_search_images). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Search Images, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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3 Mcp Search Images tools catalogued and risk-classified — across an index of 43,000+ MCP servers.