list_prompts

THE RISK

Low Risk

Why list_prompts needs a policy

This tool queries and returns metadata about available prompts without modifying, deleting, or executing anything. It is purely informational and suitable for UI presentation. No data is created, modified, or destroyed, and no external operations are triggered.

From the tool's definition Tool name 'list_prompts' and description 'List all available prompts from all active layers. Returns prompt metadata for UI display' indicates a retrieval/query operation with no side effects.

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

POLICY

How to control list_prompts

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

policy.json

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

list_prompts 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 Bc Code Intelligence — 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

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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_prompts

What does the list_prompts tool do? +

List all available prompts from all active layers. Returns prompt metadata for UI display. It is categorised as a Read tool in the Bc Code Intelligence MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_prompts? +

Register the Bc Code Intelligence MCP server in PolicyLayer and add a rule for list_prompts: 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 Bc Code Intelligence. Nothing to install.

What risk level is list_prompts? +

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

Can I rate-limit list_prompts? +

Yes. Add a rate_limit block to the list_prompts 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_prompts completely? +

Set action: deny in the PolicyLayer policy for list_prompts. 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_prompts? +

list_prompts is provided by the Bc Code Intelligence MCP server (jeremyvyska/bc-code-intelligence-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bc Code Intelligence tool call.

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

CHECK YOUR STACK →