mempool_holders_by_rune

ServerMaestro MCP Server
CategoryRead

How to control mempool_holders_by_rune ↓

WHAT IT DOES

What mempool_holders_by_rune does on Maestro MCP Server

AI agents call mempool_holders_by_rune to retrieve information from Maestro MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why mempool_holders_by_rune needs a policy

This tool retrieves and queries blockchain data about Rune token distribution without modifying, executing transactions, or deleting anything. It provides read-only access to mempool and on-chain information. The highest risk would be information disclosure of public blockchain data, which is inherently low-severity.

From the tool's definition Tool description states 'Lists all addresses currently holding a given Rune, with corresponding balances.' The verb 'lists' and the stated purpose of visualization indicate data retrieval.

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

POLICY

How to control mempool_holders_by_rune

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

policy.json

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

mempool_holders_by_rune 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 Maestro MCP Server — 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.
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FAQ

Questions about mempool_holders_by_rune

What does the mempool_holders_by_rune tool do? +

Lists all addresses currently holding a given Rune, with corresponding balances. Helps visualize token distribution and adoption. In addition to confirmed transactions, mempool endpoints return data which reflects pending transactions in some number of. It is categorised as a Read tool in the Maestro MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on mempool_holders_by_rune? +

Register the Maestro MCP Server MCP server in PolicyLayer and add a rule for mempool_holders_by_rune: 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 Maestro MCP Server. Nothing to install.

What risk level is mempool_holders_by_rune? +

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

Can I rate-limit mempool_holders_by_rune? +

Yes. Add a rate_limit block to the mempool_holders_by_rune 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 mempool_holders_by_rune completely? +

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

mempool_holders_by_rune is provided by the Maestro MCP Server MCP server (maestro-org/maestro-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Maestro MCP Server tool call.

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

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