stellar_fund_account

THE RISK

Critical Risk

Why stellar_fund_account needs a policy

This tool moves funds (test XLM) into an account on the Stellar network. While it operates on a test network (Friendbot is a testnet faucet), it commits a financial operation — transferring assets to an account. On testnet the blast radius is limited since funds have no real monetary value, hence medium severity rather than high/critical.

From the tool's definition Fund a test account using the Friendbot

Documented attack patterns abuse exactly the kind of access stellar_fund_account gives an agent:

POLICY

How to control stellar_fund_account

PolicyLayer is an MCP gateway — it sits between your AI agents and Stellar MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for stellar_fund_account:

policy.json

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

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

Create a free account and register Stellar MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

GATE THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Stellar MCP tools

Financial stellar_claim_claimable_balance Claim a claimable balance Financial stellar_create_claimable_balance Create a new claimable balance Financial stellar_payment Send a payment to another account Execute soroban_build_and_optimize Build and optimize a Soroban contract Execute soroban_deploy Deploy a Soroban contract Write stellar_change_trust Change trustline for an asset Write stellar_create_account Create a new Stellar Account Write stellar_create_asset Create a new asset on the Stellar network

All 12 Stellar MCP tools →

Financial tools on other servers

0xarchive web3_subscribe Math MCP Server financial_calculator MCP Kling generate_video MCP Uber Server uber_request_ride

Go deeper

Critical-risk tools in Stellar MCP → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about stellar_fund_account

What does the stellar_fund_account tool do? +

Fund a test account using the Friendbot. It is categorised as a Financial tool in the Stellar MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on stellar_fund_account? +

Register the Stellar MCP server in PolicyLayer and add a rule for stellar_fund_account: 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 Stellar MCP. Nothing to install.

What risk level is stellar_fund_account? +

stellar_fund_account 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 stellar_fund_account? +

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

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

stellar_fund_account is provided by the Stellar MCP server (syronlabs/stellar-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Stellar MCP tool call.

Start from Stellar MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →