Build an unsigned MarginFi WITHDRAW tx. Withdraws the specified amount (or ALL, via withdrawAll: true) from the user's supplied position in the named bank. Pre-flight refuses if the account has zero free collateral (the withdraw would push the health factor below the maintenance threshold — the o...
AI agents use prepare_marginfi_withdraw to commit financial operations through VaultPilot MCP — usually the final step of a payment, billing, or trading workflow. A call moves real money.
| Parameter | Type | Required | Description |
|---|---|---|---|
mint | object | — | Base58 SPL mint address. Used as an override or when the token isn't in the canonical SOLANA_TOKENS table. Exactly one of `symbol` or `mint` must be passed. |
amount | string | Yes | Human-readable decimal amount to withdraw. Pre-flight refuses if the withdraw would push the health factor below the maintenance threshold. |
symbol | string | — | Canonical token symbol (USDC, SOL, USDT, JUP, BONK, JTO, mSOL, jitoSOL). The builder resolves this to the underlying mint; MarginFi treats SOL as wSOL internall |
wallet | string | Yes | Base58 Solana mainnet address (ed25519 pubkey, 43 or 44 chars). |
withdrawAll | boolean | — | Set true to close the entire supplied position in this bank (lets the SDK pass the `withdraw_all` on-chain flag so the bank clears the balance slot). Omit for p |
accountIndex | integer | — | MarginfiAccount slot (0 = first, 1 = second, ...). Most users stay on 0. Use a different index to segregate positions across multiple MarginfiAccounts owned by |
Parameters from the server's own tool schema.
prepare_marginfi_withdraw moves real money, and an autonomous agent will call it with the same confidence it calls a search tool. A misread instruction or an injected prompt is all it takes to drain an account or blow a budget.
Attacks that exploit this kind of access
Build an unsigned MarginFi WITHDRAW tx. Withdraws the specified amount (or ALL, via withdrawAll: true) from the user's supplied position in the named bank. Pre-flight refuses if the account has zero free collateral (the withdraw would push the health factor below the maintenance threshold — the on-chain tx would revert). DURABLE NONCE + prepare_marginfi_init prerequisites identical to prepare_marginfi_supply. BLIND-SIGN on Ledger. It is categorised as a Financial tool in the VaultPilot MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
prepare_marginfi_withdraw accepts 6 parameters: mint, amount, symbol, wallet, withdrawAll, accountIndex. Required: amount, wallet. The full parameter table on this page comes from the server's own tool schema.
Register the VaultPilot MCP server in PolicyLayer and add a rule for prepare_marginfi_withdraw: 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 VaultPilot MCP. Nothing to install.
prepare_marginfi_withdraw 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 prepare_marginfi_withdraw 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 prepare_marginfi_withdraw. 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.
prepare_marginfi_withdraw is provided by the VaultPilot MCP server (vaultpilot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.