List Available MCP Tools.
AI agents call list_server_tools to retrieve information from Nest Protect 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 information about available MCP tools without creating, modifying, deleting, or executing any operations. It is a purely informational/discovery function that reads metadata from the server, placing it squarely in the Read category with low severity.
From the tool's definition Tool name 'list_server_tools' and description 'List Available MCP Tools' indicate retrieval of metadata about available tools with no modification or side effects.
Attacks that exploit this kind of access
List Available MCP Tools. It is categorised as a Read tool in the Nest Protect MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Nest Protect MCP Server MCP server in PolicyLayer and add a rule for list_server_tools: 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 Nest Protect MCP Server. Nothing to install.
list_server_tools 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_server_tools 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_server_tools. 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_server_tools is provided by the Nest Protect MCP Server MCP server (sandraschi/nest-protect-mcp). 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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