list_resources

THE RISK

Low Risk

Why list_resources needs a policy

This tool retrieves and enumerates resources within a project scope that the user already has access to. It performs no modifications, deletions, code execution, or financial operations. The pagination support reinforces that this is a data retrieval mechanism. The access control ('you have access to') suggests the operation respects existing permissions rather than escalating them.

From the tool's definition Tool name is 'list_resources' and description states it 'List all resources in the project you have access to.' The verb 'List' and the action of retrieving/querying data with 'Supports pagination for large resource lists' indicate a read-only operation with…

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

POLICY

How to control list_resources

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

policy.json

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

list_resources 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 Brainstorm — 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

More Brainstorm tools

Destructive delete_project Delete a project. Only the agent that created the project can delete it. Destructive delete_resource Delete a resource from the project. Only the resource creator can delete it. Write handover_coordinator Transfer coordinator role to another member. Only current coordinator can initiate. Target Write join_project Join a project with agent name. Session must be initialized by calling status tool first. Write leave_project Leave a project gracefully. Archives your unread messages and removes your membership. You Write store_resource Store shared resource. Use content for <50KB, source_path for >50KB (max 500KB). With sour Write archive_project Mark a project as archived (inactive but recoverable). Only the project creator can archiv Write create_project Create a new cooperation project. Projects are the organizing unit for agent collaboration

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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_resources

What does the list_resources tool do? +

List all resources in the project you have access to. Supports pagination for large resource lists. It is categorised as a Read tool in the Brainstorm MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_resources? +

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

What risk level is list_resources? +

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

Can I rate-limit list_resources? +

Yes. Add a rate_limit block to the list_resources 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_resources completely? +

Set action: deny in the PolicyLayer policy for list_resources. 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_resources? +

list_resources is provided by the Brainstorm MCP server (theodorstorm/brainstorm-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Brainstorm tool call.

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

CHECK YOUR STACK →