list_tools
AI agents call list_tools to retrieve information from MCP Test MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool lists available tools from a connected MCP server, which is a read-only information retrieval operation. Even though the description is empty, the tool name and the stated purpose of the testing harness (discovery and validation) strongly indicate this is for querying tool metadata.
From the tool's definition Tool name 'list_tools' and context as part of a testing harness that 'discovers their tools/resources/prompts' indicates this retrieves tool metadata without modification or execution.
Attacks that exploit this kind of access
list_tools. It is categorised as a Read tool in the MCP Test MCP MCP Server, which means it retrieves data without modifying state.
Register the MCP Test MCP server in PolicyLayer and add a rule for list_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 MCP Test MCP. Nothing to install.
list_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_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_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_tools is provided by the MCP Test MCP server (rdwj/mcp-test-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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