brc20_holders_by_ticker

THE RISK

Low Risk

Why brc20_holders_by_ticker needs a policy

This tool queries and retrieves existing blockchain data (BRC20 asset holder information) without modifying, deleting, or executing code. It is a straightforward data retrieval operation with no side effects or destructive capabilities.

From the tool's definition Tool description states 'Retrieves a list of script pubkeys or addresses that hold the specified BRC20 asset and corresponding total balances.' The verb 'retrieves' and the read-only nature of querying blockchain holder information indicate no data…

Documented attack patterns abuse exactly the kind of access brc20_holders_by_ticker gives an agent:

POLICY

How to control brc20_holders_by_ticker

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 brc20_holders_by_ticker:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "brc20_holders_by_ticker": {}
  }
}

brc20_holders_by_ticker 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

Related tools and policies

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Destructive EventManagerService_DeleteTrigger Remove a trigger Deletes a specific trigger identified by its unique \ Execute esplora_broadcast_transaction Broadcast a raw transaction to the network. The transaction should be provided as hex in t Execute rpc_submit_transaction Pushes a signed raw transaction to the network. Write EventManagerService_CreateTrigger Create a new trigger Adds a trigger to a manager to listen for specific blockchain activ Write EventManagerService_UpdateTrigger Update a trigger Allows modification of a trigger Read rpc_block_range_info Fetches basic info for a contiguous block range (start and end height). Read brc20_transfer_inscriptions_by_address Returns all unspent BRC20 transfer inscriptions residing at the address. This endpoint is Read activity_by_inscription Lists all transactions that have involved the given inscription, starting from its origin

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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 →
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FAQ

Questions about brc20_holders_by_ticker

What does the brc20_holders_by_ticker tool do? +

Retrieves a list of script pubkeys or addresses that hold the specified BRC20 asset and corresponding total balances. 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 brc20_holders_by_ticker? +

Register the Maestro MCP Server MCP server in PolicyLayer and add a rule for brc20_holders_by_ticker: 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 brc20_holders_by_ticker? +

brc20_holders_by_ticker is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit brc20_holders_by_ticker? +

Yes. Add a rate_limit block to the brc20_holders_by_ticker 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 brc20_holders_by_ticker completely? +

Set action: deny in the PolicyLayer policy for brc20_holders_by_ticker. 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 brc20_holders_by_ticker? +

brc20_holders_by_ticker 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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