AI agents call list_downstream_tools to retrieve information from Maple without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only enumerates or queries information about downstream tools available through the Maple proxy routing system. It performs a read-only discovery operation with no side effects, data modification, code execution, or resource impact. The blast radius of misuse is minimal—an AI agent might learn what tools are available, but cannot invoke them or cause damage through listing alone.
From the tool's definition Tool name 'list_downstream_tools' and description 'List tools exposed by a registered downstream MCP app' indicate retrieval/querying of available tool metadata with no modification or execution of those tools.
Attacks that exploit this kind of access
List tools exposed by a registered downstream MCP app through Maple proxy routing. It is categorised as a Read tool in the Maple MCP Server, which means it retrieves data without modifying state.
Register the Maple MCP server in PolicyLayer and add a rule for list_downstream_tools: 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 Maple. Nothing to install.
list_downstream_tools 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 list_downstream_tools 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 list_downstream_tools. 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.
list_downstream_tools is provided by the Maple MCP server (omar2001ramadan/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
list_downstream_tools is one line of Maple's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →