AI agents call hello to retrieve information from Desmos MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a greeting/status tool that simply returns a message. It performs no operations on data, executes no code, and has no destructive or financial consequences. It falls cleanly into the Read category as a minimal information return, though it retrieves nothing meaningful. Severity is low due to complete absence of risk.
From the tool's definition Tool name 'hello' and description 'A simple tool that returns a greeting' indicate a basic informational response with no data retrieval, modification, execution, or side effects.
Documented attack patterns abuse exactly the kind of access hello gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Desmos MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for hello:
{
"version": "1",
"default": "deny",
"tools": {
"hello": {}
}
}hello is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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A simple tool that returns a greeting. It is categorised as a Read tool in the Desmos MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Desmos MCP Server MCP server in PolicyLayer and add a rule for hello: 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 Desmos MCP Server. Nothing to install.
hello 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 hello 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 hello. 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.
hello is provided by the Desmos MCP Server MCP server (thegrsun/desmos-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Desmos MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 Desmos MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.