Get fungible token balance
AI agents call get_token_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 account token balance information from the Flow blockchain. It is a read-only query with no ability to modify data, execute code, delete records, or move funds. The blast radius of misuse is minimal—an attacker could only view token balances they query, with no financial or destructive consequences.
From the tool's definition Tool name 'get_token_balance' and description 'Get fungible token balance' indicate a query operation that retrieves data without modification or side effects.
Attacks that exploit this kind of access
Get fungible token balance. 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_token_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_token_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_token_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_token_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_token_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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