AI agents call hello to retrieve information from FastMCP Multi-Tenancy without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a trivial operation—generating a greeting response—with no side effects, data access, or external operations. It is informational/presentational in nature, making it the least risky category. The low severity reflects that misuse cannot cause meaningful harm.
From the tool's definition Tool name 'hello' and description 'Say hello to someone' indicate a simple greeting function with no data retrieval, modification, execution, or destructive capabilities.
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 FastMCP Multi-Tenancy, 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.
Free to start. No card required.
Say hello to someone. It is categorised as a Read tool in the FastMCP Multi-Tenancy MCP Server, which means it retrieves data without modifying state.
Register the FastMCP Multi-Tenancy 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 FastMCP Multi-Tenancy. 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 FastMCP Multi-Tenancy MCP server (timothywangdev/mcptoolkit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from FastMCP Multi-Tenancy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
4 FastMCP Multi-Tenancy tools catalogued and risk-classified — across an index of 43,000+ MCP servers.