Get Flow balance for an address
AI agents call get_balance to retrieve information from Flow MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves financial information (account balance) but performs no write, execute, or destructive operations. It is a read-only query with no side effects. Severity is low as balance inquiries pose minimal risk even if misused by an AI agent.
From the tool's definition Tool name 'get_balance' and description 'Get Flow balance for an address' indicate a query operation that retrieves balance data without modifying state.
Attacks that exploit this kind of access
Get Flow balance for an address. It is categorised as a Read tool in the Flow MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Flow MCP Server MCP server in PolicyLayer and add a rule for get_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 Flow MCP Server. Nothing to install.
get_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 get_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 get_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.
get_balance is provided by the Flow MCP Server MCP server (lmcmz/flow-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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