preview_solana_send

SERVERVaultPilot MCP SOURCEvaultpilot-mcp

High RISK CLASS

Category Execute

Parameters 11 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-szhygulin-vaultpilot-mcp/preview-solana-send.md

WHAT IT DOES

What preview_solana_send does on VaultPilot MCP

AI agents invoke preview_solana_send 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
`handle`	string	Yes	Opaque handle returned by prepare_solana_native_send / prepare_solana_spl_send. preview_solana_send fetches a fresh Solana blockhash, serializes the message byt

Parameters from the server's own tool schema.

RISK

Why preview_solana_send is rated High

This tool prepares and finalizes a Solana transaction for signing and broadcast. While it does not itself send funds, it is a critical step in a financial transaction pipeline — it fetches a live blockhash, serializes the transaction message, and computes the hash that the user approves on Ledger. Misuse or manipulation of this step could result in a malicious transaction being approved and broadcast.

From the tool's definition finalize a prepared Solana tx for signing by fetching a FRESH recent blockhash, serializing the message bytes... MUST be called between prepare_solana_* and send_transaction

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs preview_solana_send safely

PolicyLayer is an MCP gateway: it sits between your AI agents and VaultPilot MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For preview_solana_send, this is the rule to start with:

preview_solana_send Rate-limited

preview_solana_send stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "preview_solana_send": {
      "limits": [
        {
          "counter": "preview_solana_send_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect VaultPilot MCP, apply this rule, and every preview_solana_send call is checked against it from then on.

FAQ

Questions about preview_solana_send

What does the preview_solana_send tool do? +

Solana-only: finalize a prepared Solana tx for signing by fetching a FRESH recent blockhash, serializing the message bytes, and computing the base58(sha256(...)) Message Hash the Ledger Solana app will display on blind-sign. MUST be called between prepare_solana_* and send_transaction — Solana blockhashes expire after ~150 blocks (~60s), and the prepare → user-approve → broadcast path on a live Ledger routinely runs longer than that. Splitting the blockhash pin off prepare lets the user see-and-match the hash seconds before tapping Approve, with the full ~60s window available for the broadcast. Returns the pinned UnsignedSolanaTx (messageBase64 + ledger Message Hash) plus the CHECKS PERFORMED agent-task block the agent must auto-run. Re-callable on the same handle: re-calling overwrites the prior pin with a newer blockhash (useful if the user pauses between preview and send). send_transaction will throw a clear error if called without a prior 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.

What parameters does preview_solana_send accept? +

preview_solana_send accepts 1 parameter: handle. Required: handle. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on preview_solana_send? +

Register the VaultPilot MCP server in PolicyLayer and add a rule for preview_solana_send: 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.

What risk level is preview_solana_send? +

preview_solana_send is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit preview_solana_send? +

Yes. Add a rate_limit block to the preview_solana_send 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.

How do I block preview_solana_send completely? +

Set action: deny in the PolicyLayer policy for preview_solana_send. 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.

What MCP server provides preview_solana_send? +

preview_solana_send 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.

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