AI agents call get_login_qrcode to retrieve information from Xhs Kit without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns a QR code image in Base64 format for authentication purposes. It is a read-only operation that queries data without creating, modifying, deleting, or executing any actions. The returned QR code is static login metadata, not sensitive user data modification.
From the tool's definition Tool name is 'get_login_qrcode' and description indicates it 'retrieves login QR code (returns Base64 image)' — a purely informational retrieval operation with no side effects or data modification.
Attacks that exploit this kind of access
获取登录二维码（返回 Base64 图片）。. It is categorised as a Read tool in the Xhs Kit MCP Server, which means it retrieves data without modifying state.
Register the Xhs Kit MCP server in PolicyLayer and add a rule for get_login_qrcode: 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 Xhs Kit. Nothing to install.
get_login_qrcode 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 get_login_qrcode 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 get_login_qrcode. 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.
get_login_qrcode is provided by the Xhs Kit MCP server (luweizheng/xhs-kit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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