stellar_change_trust

THE RISK

Medium Risk

Why stellar_change_trust needs a policy

This tool modifies financial account state by establishing or altering trustlines, which is a write operation that affects which assets an account can hold. While the operation is reversible (trustlines can be removed or modified), the financial implications are significant—misconfigured trustlines can lock assets or enable unwanted transactions.

From the tool's definition Tool name 'stellar_change_trust' and description 'Change trustline for an asset' indicate modification of trust relationships for assets on the Stellar network. Trustlines are reversible account configurations that enable holding and trading specific assets.

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

POLICY

How to control stellar_change_trust

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_change_trust:

policy.json

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

stellar_change_trust 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.

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.

LIMIT 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_fund_account Fund a test account using the Friendbot 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_create_account Create a new Stellar Account Write stellar_create_asset Create a new asset on the Stellar network

All 12 Stellar MCP tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about stellar_change_trust

What does the stellar_change_trust tool do? +

Change trustline for an asset. It is categorised as a Write tool in the Stellar MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on stellar_change_trust? +

Register the Stellar MCP server in PolicyLayer and add a rule for stellar_change_trust: 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_change_trust? +

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

Can I rate-limit stellar_change_trust? +

Yes. Add a rate_limit block to the stellar_change_trust 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_change_trust completely? +

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

stellar_change_trust 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 →