AI agents call list to retrieve information from Executor without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries data without modification, deletion, or execution capabilities. The explicit 'read-only' designation confirms it performs no state-changing operations. Severity is low as listing operations have minimal blast radius.
From the tool's definition Tool name 'list' with description 'A read-only tool' explicitly indicates data retrieval with no side effects.
Documented attack patterns abuse exactly the kind of access list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Executor, and nothing reaches the server without passing your rules. This is the rule we recommend for list:
{
"version": "1",
"default": "deny",
"tools": {
"list": {}
}
}list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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A read-only tool. It is categorised as a Read tool in the Executor MCP Server, which means it retrieves data without modifying state.
Register the Executor MCP server in PolicyLayer and add a rule for list: 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 Executor. Nothing to install.
list 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 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. 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 is provided by the Executor MCP server (rhyssullivan/executor). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 29 Executor tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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29 Executor tools catalogued and risk-classified — across an index of 42,500+ MCP servers.