Launch a target stdio MCP server and list its prompts. Use a wrapper session when prompt reads are part of a larger stateful target workflow.
AI agents call stdio_mcp_list_prompts to retrieve information from MCP Stdio Wrapper 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 prompt information from a target MCP server. It is a read-only operation that discovers available prompts without altering any state or executing code. The 'launch' aspect refers to spinning up the server process (a necessary precondition), not to executing arbitrary operations. The low severity reflects that listing prompts carries minimal blast radius if misused by an AI agent.
From the tool's definition Tool name contains 'list_prompts' and description states 'list its prompts' — a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Launch a target stdio MCP server and list its prompts. Use a wrapper session when prompt reads are part of a larger stateful target workflow. It is categorised as a Read tool in the MCP Stdio Wrapper MCP Server, which means it retrieves data without modifying state.
Register the MCP Stdio Wrapper MCP server in PolicyLayer and add a rule for stdio_mcp_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 MCP Stdio Wrapper. Nothing to install.
stdio_mcp_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 stdio_mcp_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 stdio_mcp_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.
stdio_mcp_list_prompts is provided by the MCP Stdio Wrapper MCP server (joshuagreeff/mcp-stdio-wrapper). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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