AI agents call stellar_balance to retrieve information from Stellar MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple data retrieval operation (balance query) with no side effects, no data modification, no code execution, and no financial transaction. It aligns with the Read category definition: 'retrieves or queries data; no side effects.' The low severity reflects minimal blast radius if misused—an agent could only access balance information already visible on the public blockchain.
From the tool's definition Tool name 'stellar_balance' and description 'Get the balance of a Stellar Account' indicate a read-only query operation that retrieves account balance information without modification.
Documented attack patterns abuse exactly the kind of access stellar_balance gives an agent:
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_balance:
{
"version": "1",
"default": "deny",
"tools": {
"stellar_balance": {}
}
}stellar_balance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the balance of a Stellar Account. It is categorised as a Read tool in the Stellar MCP MCP Server, which means it retrieves data without modifying state.
Register the Stellar MCP server in PolicyLayer and add a rule for stellar_balance: 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.
stellar_balance is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the stellar_balance 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.
Set action: deny in the PolicyLayer policy for stellar_balance. 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.
stellar_balance 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.
Start from Stellar MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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12 Stellar MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.