list_tools

Provides a list of available tools and their descriptions.

SERVEROpen Stocks MCP SOURCEopen-agent-tools/open-stocks-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/open-agent-tools-open-stocks-mcp/list-tools.md

WHAT IT DOES

What list_tools does on Open Stocks MCP

AI agents call list_tools to retrieve information from Open Stocks MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_tools is rated Low

This is a metadata query that retrieves information about available tools. It has no side effects, does not modify or delete data, does not execute external operations, and does not involve financial transactions. It is a straightforward Read operation with minimal security risk.

From the tool's definition Tool name 'list_tools' and description 'Provides a list of available tools and their descriptions' indicate a simple enumeration/discovery operation with no data modification, deletion, or financial impact.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_tools safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Open Stocks MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_tools, this is the rule to start with:

list_tools Allowed

list_tools is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_tools": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Open Stocks MCP, apply this rule, and every list_tools call is checked against it from then on.

FAQ

Questions about list_tools

What does the list_tools tool do? +

Provides a list of available tools and their descriptions. It is categorised as a Read tool in the Open Stocks MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_tools? +

Register the Open Stocks 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 Open Stocks MCP. Nothing to install.

What risk level is list_tools? +

list_tools is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_tools? +

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.

How do I block list_tools completely? +

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.

What MCP server provides list_tools? +

list_tools is provided by the Open Stocks MCP server (open-agent-tools/open-stocks-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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