AI agents call list_prompts to retrieve information from Prompts 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 returns a list of existing prompts without creating, modifying, deleting, or executing anything. It is a pure read operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name is 'list_prompts' and description states 'List all available prompts' — a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_prompts gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Prompts MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_prompts:
{
"version": "1",
"default": "deny",
"tools": {
"list_prompts": {}
}
}list_prompts 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 available prompts. It is categorised as a Read tool in the Prompts MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Prompts MCP Server MCP server in PolicyLayer and add a rule for list_prompts: 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 Prompts MCP Server. Nothing to install.
list_prompts 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_prompts 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_prompts. 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_prompts is provided by the Prompts MCP Server MCP server (tanker327/prompts-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Prompts MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 Prompts MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.