AI agents call greet to retrieve information from Demo without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool produces a greeting string as output with no capability to read, write, execute, or modify external state. It falls clearly under Read category as a benign information retrieval/generation operation with minimal security risk.
From the tool's definition Tool name is 'greet' and description states it generates a greeting message (生成一条问候语 = 'generate a greeting message'). This is a simple text generation operation with no side effects, data retrieval beyond trivial output, or external state changes.
Attacks that exploit this kind of access
生成一条问候语. It is categorised as a Read tool in the Demo MCP Server, which means it retrieves data without modifying state.
Register the Demo MCP server in PolicyLayer and add a rule for greet: 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 Demo. Nothing to install.
greet 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 greet 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 greet. 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.
greet is provided by the Demo MCP server (liuyuyan6100/mcp-server-demo). 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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