wallet_listOutputs

THE RISK

Low Risk

Why wallet_listOutputs needs a policy

This tool retrieves and lists blockchain outputs (UTXOs) from a wallet, which is a read-only operation. It does not spend, transfer, or modify any funds—it only queries the state of available outputs. While it reveals financial information (spendable funds), it causes no side effects and does not commit any financial transactions.

From the tool's definition Tool name 'wallet_listOutputs' and description 'Lists spendable outputs in a basket, optionally filtered by tags' indicates a query/retrieval operation with no modification or spending of funds.

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

POLICY

How to control wallet_listOutputs

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

policy.json

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

wallet_listOutputs 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 Bitcoin SV 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

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
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 →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about wallet_listOutputs

What does the wallet_listOutputs tool do? +

Lists spendable outputs in a basket, optionally filtered by tags. It is categorised as a Read tool in the Bitcoin SV MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on wallet_listOutputs? +

Register the Bitcoin SV MCP Server MCP server in PolicyLayer and add a rule for wallet_listOutputs: 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 Bitcoin SV MCP Server. Nothing to install.

What risk level is wallet_listOutputs? +

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

Can I rate-limit wallet_listOutputs? +

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

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

wallet_listOutputs is provided by the Bitcoin SV MCP Server MCP server (b-open-io/bsv-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bitcoin SV MCP Server tool call.

Start from Bitcoin SV 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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