AI agents call aiQrcode 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.
This tool performs image analysis and data extraction on existing bucket objects. It retrieves QR code content information from stored images—a read-only operation with no side effects, no data modification, and no external command execution. The severity is low because misuse would only expose information contained in QR codes, with no capability to alter storage, execute commands, or trigger financial actions.
From the tool's definition Tool description: '图片处理-二维码识别-识别存储桶内二维码图片内容' (Image processing - QR code recognition - recognize QR code image content in storage bucket).
Documented attack patterns abuse exactly the kind of access aiQrcode 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 aiQrcode:
{
"version": "1",
"default": "deny",
"tools": {
"aiQrcode": {}
}
}aiQrcode is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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图片处理-二维码识别-识别存储桶内二维码图片内容. 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 aiQrcode: 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.
aiQrcode 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 aiQrcode 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 aiQrcode. 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.
aiQrcode 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.
Free to start. No card required.
21 Tencent Cloud COS MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.