prepare_safe_tx_approve

SERVERVaultPilot MCP SOURCEvaultpilot-mcp

Medium RISK CLASS

Category Write

Parameters 43 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/prepare-safe-tx-approve.md

WHAT IT DOES

What prepare_safe_tx_approve does on VaultPilot MCP

AI agents use prepare_safe_tx_approve 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
`chain`	string	—
`signer`	string	Yes
`safeTxHash`	string	Yes
`safeAddress`	string	Yes

Parameters from the server's own tool schema.

RISK

Why prepare_safe_tx_approve is rated Medium

This tool creates/modifies transaction approval records by adding signatures to a multi-sig Safe wallet's transaction queue. While it does not directly execute a final transaction transfer, it materially advances a queued transaction toward execution by adding approvals.

From the tool's definition Tool adds 'an additional approveHash signature' to a Safe transaction, modifying transaction approval state.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

prepare_safe_tx_approve Rate-limited

prepare_safe_tx_approve stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "prepare_safe_tx_approve": {
      "limits": [
        {
          "counter": "prepare_safe_tx_approve_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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 prepare_safe_tx_approve call is checked against it from then on.

FAQ

Questions about prepare_safe_tx_approve

What does the prepare_safe_tx_approve tool do? +

Add an additional approveHash signature to a Safe (Gnosis Safe) transaction that's ALREADY in the queue (proposed elsewhere — Safe Web UI, another VaultPilot install, or a co-signer). Returns an UnsignedTx that calls Safe.approveHash(safeTxHash) for the given signer; broadcast via send_transaction, then call submit_safe_tx_signature to push the new signature to Safe Transaction Service. Use prepare_safe_tx_propose instead when you're proposing a NEW Safe tx. 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.

What parameters does prepare_safe_tx_approve accept? +

prepare_safe_tx_approve accepts 4 parameters: chain, signer, safeTxHash, safeAddress. Required: signer, safeTxHash, 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_approve? +

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

prepare_safe_tx_approve is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit prepare_safe_tx_approve? +

Yes. Add a rate_limit block to the prepare_safe_tx_approve 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_approve completely? +

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

prepare_safe_tx_approve 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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