AI agents call list_graphs to retrieve information from Mcp Graph Engine without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays information about graph sessions and their statistics. It has no side effects, does not modify data, does not execute code or algorithms, and does not delete anything. It is a straightforward read operation that queries and returns existing graph session information.
From the tool's definition Tool name 'list_graphs' and description 'List all graph sessions with statistics' indicate retrieval and enumeration of existing graph metadata without modification, deletion, or execution of arbitrary operations.
Documented attack patterns abuse exactly the kind of access list_graphs gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Graph Engine, and nothing reaches the server without passing your rules. This is the rule we recommend for list_graphs:
{
"version": "1",
"default": "deny",
"tools": {
"list_graphs": {}
}
}list_graphs is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all graph sessions with statistics. It is categorised as a Read tool in the Mcp Graph Engine MCP Server, which means it retrieves data without modifying state.
Register the Mcp Graph Engine MCP server in PolicyLayer and add a rule for list_graphs: 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 Mcp Graph Engine. Nothing to install.
list_graphs 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_graphs 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_graphs. 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_graphs is provided by the Mcp Graph Engine MCP server (utilitydelta/mcp-graph-engine). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Graph Engine, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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24 Mcp Graph Engine tools catalogued and risk-classified — across an index of 43,000+ MCP servers.