AI agents call getBucket 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 queries and retrieves a file listing from cloud storage. It performs no modifications, deletions, or execution of code. This is a read-only operation with minimal risk—listing files is informational with no destructive or financial impact.
From the tool's definition Tool name 'getBucket' with description '查询存储桶内的文件列表' (query/list files in a bucket). This is a list/query operation that retrieves data without side effects.
Documented attack patterns abuse exactly the kind of access getBucket 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 getBucket:
{
"version": "1",
"default": "deny",
"tools": {
"getBucket": {}
}
}getBucket is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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查询存储桶内的文件列表. 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 getBucket: 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.
getBucket 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 getBucket 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 getBucket. 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.
getBucket 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.