wallet_sweepBsv21

THE RISK

Critical Risk

Why wallet_sweepBsv21 needs a policy

This tool moves cryptocurrency tokens (BSV21) by transferring them from an external private key into a wallet. This constitutes a financial operation involving the movement of digital assets. Misuse could result in unauthorized transfer of tokens, making this a critical-severity financial action.

From the tool's definition Sweep BSV21 tokens from an external WIF private key into the wallet

Documented attack patterns abuse exactly the kind of access wallet_sweepBsv21 gives an agent:

POLICY

How to control wallet_sweepBsv21

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_sweepBsv21:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "wallet_sweepBsv21": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to wallet_sweepBsv21 is blocked until a human approves it. The rest of the server keeps working.

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

Govern MCP payment tools → Approval gates, spend caps, and per-identity scopes on every refund, payout, and charge your agents make.
Critical-risk tools in Bitcoin SV MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about wallet_sweepBsv21

What does the wallet_sweepBsv21 tool do? +

Sweep BSV21 tokens from an external WIF private key into the wallet. It is categorised as a Financial tool in the Bitcoin SV MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on wallet_sweepBsv21? +

Register the Bitcoin SV MCP Server MCP server in PolicyLayer and add a rule for wallet_sweepBsv21: 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_sweepBsv21? +

wallet_sweepBsv21 is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit wallet_sweepBsv21? +

Yes. Add a rate_limit block to the wallet_sweepBsv21 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_sweepBsv21 completely? +

Set action: deny in the PolicyLayer policy for wallet_sweepBsv21. 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_sweepBsv21? +

wallet_sweepBsv21 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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