AI agents call list_agents to retrieve information from AI Cognitive Nexus without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns existing agent definitions without modifying, executing, or deleting data. It is a simple enumeration endpoint typical of Read category tools. Low severity because listing agents poses minimal risk—it only reveals configuration metadata without enabling destructive or financial actions.
From the tool's definition Tool name 'list_agents' and description '列出所有已定义的角色(Agent)' (list all defined agents/roles) indicate a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_agents gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AI Cognitive Nexus, and nothing reaches the server without passing your rules. This is the rule we recommend for list_agents:
{
"version": "1",
"default": "deny",
"tools": {
"list_agents": {}
}
}list_agents is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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列出所有已定义的角色(Agent)。. It is categorised as a Read tool in the AI Cognitive Nexus MCP Server, which means it retrieves data without modifying state.
Register the AI Cognitive Nexus MCP server in PolicyLayer and add a rule for list_agents: 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 AI Cognitive Nexus. Nothing to install.
list_agents 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_agents 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_agents. 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_agents is provided by the AI Cognitive Nexus MCP server (simonutd/ai-cognitive-nexus-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AI Cognitive Nexus, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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22 AI Cognitive Nexus tools catalogued and risk-classified — across an index of 43,000+ MCP servers.