AI agents call getObject to retrieve information from Tencent Cloud COS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a read operation by downloading/retrieving files from Tencent Cloud COS. It has no side effects on the stored data itself. Severity is medium rather than low because unauthorized access to cloud storage files could expose sensitive data, and the tool operates on cloud infrastructure with broader impact than local file reads. Confidence is high as the function is explicitly retrieving stored objects.
From the tool's definition Tool name 'getObject' with description '下载存储桶内的文件' (download files from storage bucket) - this retrieves/downloads data from cloud storage without modifying or deleting it.
Documented attack patterns abuse exactly the kind of access getObject gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Tencent Cloud COS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for getObject:
{
"version": "1",
"default": "deny",
"tools": {
"getObject": {}
}
}getObject is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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下载存储桶内的文件. It is categorised as a Read tool in the Tencent Cloud COS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Tencent Cloud COS MCP Server MCP server in PolicyLayer and add a rule for getObject: 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 Tencent Cloud COS MCP Server. Nothing to install.
getObject is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the getObject 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 getObject. 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.
getObject is provided by the Tencent Cloud COS MCP Server MCP server (tencent/cos-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 21 Tencent Cloud COS MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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21 Tencent Cloud COS MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.