Build an unsigned MarginFi SUPPLY tx for a given bank (by symbol or mint). Supplies the specified amount of the underlying token into the user's MarginfiAccount position in that bank, earning the bank's supply APY. DURABLE NONCE REQUIRED + prepare_marginfi_init must have run first; otherwise this...
AI agents invoke prepare_marginfi_supply to trigger actions in VaultPilot MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
| Parameter | Type | Required | Description |
|---|---|---|---|
mint | string | — | 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 supply (e.g. "1.5" for 1.5 USDC). Decimals resolved from the bank's mint — do NOT pass raw base units. |
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 | Solana wallet executing the supply. Must have an initialized MarginfiAccount (run prepare_marginfi_init first) AND a durable-nonce account (prepare_solana_nonce |
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_supply triggers real processes with real consequences. An agent gone sideways doesn't fire it once — it starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.
Attacks that exploit this kind of access
Build an unsigned MarginFi SUPPLY tx for a given bank (by symbol or mint). Supplies the specified amount of the underlying token into the user's MarginfiAccount position in that bank, earning the bank's supply APY. DURABLE NONCE REQUIRED + prepare_marginfi_init must have run first; otherwise this tool errors. Pre-flight: bank-pause check; invalid-mint check (MarginFi only lists a subset of SPL tokens). Uses v0 VersionedTransaction + MarginFi group ALTs for compact wire size. BLIND-SIGN on Ledger — match the Message Hash on-device after preview_solana_send. It is categorised as a Execute tool in the VaultPilot MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
prepare_marginfi_supply accepts 5 parameters: mint, amount, symbol, wallet, 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_supply: 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_supply is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the prepare_marginfi_supply 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_supply. 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_supply 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.