prepare_safe_tx_propose

SERVERVaultPilot MCP SOURCEvaultpilot-mcp

Critical RISK CLASS

Category Financial

Parameters 53 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-szhygulin-vaultpilot-mcp/prepare-safe-tx-propose.md

WHAT IT DOES

What prepare_safe_tx_propose does on VaultPilot MCP

AI agents use prepare_safe_tx_propose 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
`chain`	string	—
`inner`	object	Yes
`signer`	string	Yes
`safeAddress`	string	Yes
`nonceOverride`	string	—

Parameters from the server's own tool schema.

RISK

Why prepare_safe_tx_propose is rated Critical

This tool initiates a multisig crypto transaction on Gnosis Safe, which can encode arbitrary on-chain actions including token transfers, DeFi interactions, or contract calls with financial consequences. Misuse could result in unauthorized fund movements across EVM networks. The ability to pass raw `to/value/data` parameters makes this especially dangerous as an AI agent could encode arbitrary financial transactions.

From the tool's definition Propose a new Safe (Gnosis Safe) multisig transaction... wraps an inner action — either a previous prepare_*'s handle OR raw `to / value / data` — into a SafeTx... returns an UnsignedTx that calls `Safe.approveHash(safeTxHash)`

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs prepare_safe_tx_propose 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 prepare_safe_tx_propose, this is the rule to start with:

prepare_safe_tx_propose Approval-gated

Any call to prepare_safe_tx_propose is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "prepare_safe_tx_propose": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about prepare_safe_tx_propose

What does the prepare_safe_tx_propose tool do? +

Propose a new Safe (Gnosis Safe) multisig transaction. Wraps an inner action — either a previous prepare_*'s handle (recommended; pulls to/value/data from server-side state) OR raw to / value / data — into a SafeTx, computes its EIP-712 hash, and returns an UnsignedTx that calls Safe.approveHash(safeTxHash). The proposer broadcasts that approveHash via send_transaction; once mined, call submit_safe_tx_signature to post the proposal to Safe Transaction Service. Uses the on-chain approveHash flow (NOT off-chain eth_signTypedData_v4) — preserves the WalletConnect anti-Permit2-phishing scope. Default operation is CALL (0); DELEGATECALL (1) is high-risk and is flagged in the receipt. 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.

What parameters does prepare_safe_tx_propose accept? +

prepare_safe_tx_propose accepts 5 parameters: chain, inner, signer, safeAddress, nonceOverride. Required: inner, signer, safeAddress. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on prepare_safe_tx_propose? +

Register the VaultPilot MCP server in PolicyLayer and add a rule for prepare_safe_tx_propose: 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 prepare_safe_tx_propose? +

prepare_safe_tx_propose is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit prepare_safe_tx_propose? +

Yes. Add a rate_limit block to the prepare_safe_tx_propose 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 prepare_safe_tx_propose completely? +

Set action: deny in the PolicyLayer policy for prepare_safe_tx_propose. 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 prepare_safe_tx_propose? +

prepare_safe_tx_propose 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.

KEEP EXPLORING

More on VaultPilot, and thousands of servers like it.

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Guides

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