下载远程文件到项目根目录下的指定相对路径。例如：小程序的 Tabbar 等素材图片，必须使用 png 格式，可以从 Unsplash、wikimedia【一般选用 500 大小即可、Pexels、Apple 官方 UI 等资源中选择来下载。
AI agents use downloadRemoteFile to create or update resources in CloudBase MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your CloudBase MCP environment.
This tool downloads files from remote sources and writes them to the local project filesystem. It creates/modifies files on disk, making it a Write operation. Misuse could lead to malicious files being written to the project, but effects are reversible (files can be deleted), so Write is the appropriate category rather than Execute or Destructive.
From the tool's definition 下载远程文件到项目根目录下的指定相对路径 (downloads remote files to a specified relative path under the project root directory)
Documented attack patterns abuse exactly the kind of access downloadRemoteFile gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CloudBase MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for downloadRemoteFile:
{
"version": "1",
"default": "deny",
"tools": {
"downloadRemoteFile": {
"limits": [
{
"counter": "downloadremotefile_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}downloadRemoteFile 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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下载远程文件到项目根目录下的指定相对路径。例如：小程序的 Tabbar 等素材图片，必须使用 png 格式，可以从 Unsplash、wikimedia【一般选用 500 大小即可、Pexels、Apple 官方 UI 等资源中选择来下载。. It is categorised as a Write tool in the CloudBase MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the CloudBase MCP server in PolicyLayer and add a rule for downloadRemoteFile: 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 CloudBase MCP. Nothing to install.
downloadRemoteFile 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 downloadRemoteFile 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 downloadRemoteFile. 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.
downloadRemoteFile is provided by the CloudBase MCP server (tencentcloudbase/cloudbase-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 CloudBase MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
8 CloudBase MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.