Transfer SOL from the configured wallet to a destination address. Requires PRIVATE_KEY environment variable.
AI agents use transfer_sol to commit financial operations through Solana MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool directly moves cryptocurrency (SOL) from one wallet to another, which is a financial transaction that commits monetary value. This is the most severe category. Critical severity is warranted because an agent misuse could result in immediate and irreversible loss of funds. The requirement for a private key confirms this is an actual fund-moving operation, not a simulation or read-only action.
From the tool's definition transfer_sol: Transfer SOL from the configured wallet to a destination address. Requires PRIVATE_KEY environment variable. SOL is the native token on the Solana blockchain, and transferring it moves money/financial value between addresses.
Attacks that exploit this kind of access
Transfer SOL from the configured wallet to a destination address. Requires PRIVATE_KEY environment variable. It is categorised as a Financial tool in the Solana MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Solana MCP Server MCP server in PolicyLayer and add a rule for transfer_sol: 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 Solana MCP Server. Nothing to install.
transfer_sol 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 transfer_sol 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 transfer_sol. 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.
transfer_sol is provided by the Solana MCP Server MCP server (visioneth/solana-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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