list_file_types

THE RISK

Low Risk

Why list_file_types needs a policy

This tool retrieves metadata about supported file types without modifying, executing, or deleting anything. It's a read-only query operation with no side effects. The low severity reflects minimal blast radius—misuse cannot harm data or trigger unintended operations.

From the tool's definition Tool name 'list_file_types' and description 'List all supported file types' indicate a retrieval operation that queries what file types are supported by the search system.

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

POLICY

How to control list_file_types

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

policy.json

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

list_file_types 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 CodeSeeker-MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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All 12 CodeSeeker-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_file_types

What does the list_file_types tool do? +

List all supported file types that can be used with -t option. It is categorised as a Read tool in the CodeSeeker-MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_file_types? +

Register the CodeSeeker- MCP server in PolicyLayer and add a rule for list_file_types: 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 CodeSeeker-MCP. Nothing to install.

What risk level is list_file_types? +

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

Can I rate-limit list_file_types? +

Yes. Add a rate_limit block to the list_file_types 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_file_types completely? +

Set action: deny in the PolicyLayer policy for list_file_types. 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_file_types? +

list_file_types is provided by the CodeSeeker- MCP server (mixelpixx/codeseeker-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every CodeSeeker-MCP tool call.

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

CHECK YOUR STACK →