Tear down a previously-initialized durable-nonce account and return its full balance (~0.00144 SOL) to the main wallet. ix[0] = SystemProgram.nonceAdvance (self-protecting, same pattern as any durable-nonce-protected send — so this close tx itself won't expire during Ledger review), ix[1] = Syste...
AI agents use prepare_solana_nonce_close to create or update resources in VaultPilot MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your VaultPilot MCP environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
wallet | string | Yes | Solana wallet whose durable-nonce account should be closed. The full balance (~0.00144 SOL rent-exempt seed) is returned to this same wallet. |
Parameters from the server's own tool schema.
An AI agent can call prepare_solana_nonce_close faster than any human can review — one bad instruction and it creates or modifies resources in VaultPilot MCP by the hundred, each call as confident as the last.
Attacks that exploit this kind of access
Tear down a previously-initialized durable-nonce account and return its full balance (~0.00144 SOL) to the main wallet. ix[0] = SystemProgram.nonceAdvance (self-protecting, same pattern as any durable-nonce-protected send — so this close tx itself won't expire during Ledger review), ix[1] = SystemProgram.nonceWithdraw (drains the balance). After broadcast, subsequent sends from this wallet will refuse until prepare_solana_nonce_init is run again. Refuses if no nonce account exists for the wallet. It is categorised as a Write tool in the VaultPilot MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
prepare_solana_nonce_close accepts 1 parameter: wallet. Required: 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_solana_nonce_close: 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_solana_nonce_close is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the prepare_solana_nonce_close 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_solana_nonce_close. 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_solana_nonce_close 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.