mempool_runes_by_address

Provides a list of all Rune assets held by the specified address. It returns both total and available balances, allowing for token inventory management and portfolio tracking. In addition to confirmed transactions, mempool endpoints return data which reflects pending transactions in some number of

ServerMaestro MCP Server
CategoryRead

How to control mempool_runes_by_address ↓

WHAT IT DOES

What mempool_runes_by_address does on Maestro MCP Server

AI agents call mempool_runes_by_address 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_runes_by_address needs a policy

This tool retrieves and queries blockchain data about Rune token holdings for a given address. It performs read-only operations with no side effects—no assets are transferred, no transactions are executed, and no data is modified. The tool enables portfolio tracking and inventory inspection, which are purely informational use cases.

From the tool's definition Tool description states it 'Provides a list of all Rune assets held by the specified address' and mentions 'returns both total and available balances, allowing for token inventory management and portfolio tracking.' These are query/retrieval operations with…

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

POLICY

How to control mempool_runes_by_address

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_runes_by_address:

policy.json

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

mempool_runes_by_address 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.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

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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 mempool_runes_by_address

What does the mempool_runes_by_address tool do? +

How do I enforce a policy on mempool_runes_by_address? +

Register the Maestro MCP Server MCP server in PolicyLayer and add a rule for mempool_runes_by_address: 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_runes_by_address? +

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

Can I rate-limit mempool_runes_by_address? +

Yes. Add a rate_limit block to the mempool_runes_by_address 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_runes_by_address completely? +

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

mempool_runes_by_address 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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117 Maestro MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.