Send BTC to one or more recipients with sat-denominated amounts.
AI agents use btc_send_transfer to commit financial operations through Bitcoin wallet MCP server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool directly transfers Bitcoin to recipient addresses, which constitutes moving financial assets and committing financial obligations. This is the most severe category (Financial > Destructive > Execute > Write > Read). The blast radius of misuse by an AI agent is critical: unauthorized sending of BTC results in permanent loss of funds with no recovery mechanism.
From the tool's definition Tool description states 'Send BTC to one or more recipients' - this is a direct transfer of cryptocurrency funds. Combined with server description indicating 'sending' operations on a Bitcoin wallet MCP server, this tool moves money (BTC) irreversibly.
Attacks that exploit this kind of access
Send BTC to one or more recipients with sat-denominated amounts. It is categorised as a Financial tool in the Bitcoin wallet MCP server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Bitcoin wallet MCP server MCP server in PolicyLayer and add a rule for btc_send_transfer: 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 wallet MCP server. Nothing to install.
btc_send_transfer is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the btc_send_transfer 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.
Set action: deny in the PolicyLayer policy for btc_send_transfer. 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.
btc_send_transfer is provided by the Bitcoin wallet MCP server MCP server (markmhendrickson/mcp-server-bitcoin). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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