list_available_mcps

THE RISK

Low Risk

Why list_available_mcps needs a policy

This is a purely informational tool that queries and returns a list of available MCPs and their associated tools. It has no side effects, does not create, modify, or delete data, and does not execute external operations. The blast radius of misuse is minimal—an agent could only gather metadata about available services, which would have low impact.

From the tool's definition Tool name 'list_available_mcps' and description 'List all available MCPs and their tools' indicate a read-only operation that retrieves metadata about available MCP servers and their exposed tools without modifying any data.

Documented attack patterns abuse exactly the kind of access list_available_mcps gives an agent:

POLICY

How to control list_available_mcps

PolicyLayer is an MCP gateway — it sits between your AI agents and SEC MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_available_mcps:

policy.json

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

list_available_mcps is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register SEC MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

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All 62 SEC MCP tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_available_mcps

What does the list_available_mcps tool do? +

List all available MCPs and their tools. It is categorised as a Read tool in the SEC MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_available_mcps? +

Register the SEC MCP server in PolicyLayer and add a rule for list_available_mcps: 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 SEC MCP. Nothing to install.

What risk level is list_available_mcps? +

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

Can I rate-limit list_available_mcps? +

Yes. Add a rate_limit block to the list_available_mcps 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_available_mcps completely? +

Set action: deny in the PolicyLayer policy for list_available_mcps. 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_available_mcps? +

list_available_mcps is provided by the SEC MCP server (luisrincon23/sec-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every SEC MCP tool call.

Start from SEC MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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