prepare_morpho_repay

Build an unsigned Morpho Blue repay transaction. Includes an approve step if needed. Explicit amount only — "max" is not supported.

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-morpho-repay.md

WHAT IT DOES

What prepare_morpho_repay does on VaultPilot MCP

AI agents use prepare_morpho_repay 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	Description
`chain`	string	—	EVM chain Morpho Blue is deployed on. Currently only ethereum is enabled.
`amount`	string	Yes	Human-readable decimal amount, NOT raw wei/base units. Example: "10" for 10 USDC. Pass "max" for full-balance withdraw/repay.
`wallet`	string	Yes	0x-prefixed EVM wallet address (40 hex chars) that will execute this action.
`marketId`	string	Yes	Morpho Blue market id — 32-byte hex (0x + 64 hex chars). Identifies the market's (loanToken, collateralToken, oracle, irm, lltv) tuple. Discover via get_morpho_
`approvalCap`	string	—	Cap on the ERC-20 approval preceding this action. Omit for "unlimited" (standard DeFi UX — fewer follow-up approvals). Pass "exact" to approve only what this ac

Parameters from the server's own tool schema.

RISK

Why prepare_morpho_repay is rated Critical

Repaying a DeFi loan is a financial operation that moves crypto assets to settle debt on Morpho Blue. Even though the transaction is unsigned (prepared/built), the tool's purpose is to facilitate a financial commitment — repaying borrowed funds — which falls squarely in the Financial category. The approval step further confirms token transfers are involved.

From the tool's definition 'repay transaction' on Morpho Blue (a DeFi lending protocol), 'approve step if needed' — this prepares a transaction to repay a loan position on-chain, committing a financial obligation

Attacks that exploit this kind of access

RECOMMENDED RULE

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

prepare_morpho_repay Approval-gated

Any call to prepare_morpho_repay 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_morpho_repay": {
      "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_morpho_repay call is checked against it from then on.

FAQ

Questions about prepare_morpho_repay

What does the prepare_morpho_repay tool do? +

Build an unsigned Morpho Blue repay transaction. Includes an approve step if needed. Explicit amount only — "max" is not supported. 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_morpho_repay accept? +

prepare_morpho_repay accepts 5 parameters: chain, amount, wallet, marketId, approvalCap. Required: amount, wallet, marketId. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on prepare_morpho_repay? +

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

prepare_morpho_repay 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_morpho_repay? +

Yes. Add a rate_limit block to the prepare_morpho_repay 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_morpho_repay completely? +

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

prepare_morpho_repay 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.

This server

All 189 VaultPilot tools → Critical-risk tools on this server →

Across the catalogue

All critical-risk MCP tools → The MCP Attack Database →

Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →