AI agents call list_event_streams to retrieve information from AAP Enterprise MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves information about existing event streams without creating, modifying, deleting, or executing anything. It is a straightforward read operation on data. The blast radius of misuse is minimal—an unauthorized listing would expose metadata about event streams but cannot trigger workflows or modify infrastructure.
From the tool's definition Tool name 'list_event_streams' and description 'List all event streams' indicate a retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access list_event_streams gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AAP Enterprise MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_event_streams:
{
"version": "1",
"default": "deny",
"tools": {
"list_event_streams": {}
}
}list_event_streams 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 event streams. It is categorised as a Read tool in the AAP Enterprise MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AAP Enterprise MCP Server MCP server in PolicyLayer and add a rule for list_event_streams: 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 AAP Enterprise MCP Server. Nothing to install.
list_event_streams 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_event_streams 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_event_streams. 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_event_streams is provided by the AAP Enterprise MCP Server MCP server (sibilleb/aap-enterprise-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 69 AAP Enterprise MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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69 AAP Enterprise MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.