Get the FLOW balance for a Flow address on flow blockchain, the flow address is 16 characters long or 18 characters long with 0x prefix NOTE: This is a flow blockchin tool, not for flow EVM chain.
AI agents call get_flow_balance to retrieve information from Flow MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves blockchain balance information for a given address without creating, modifying, deleting, or executing any operations. It is purely a data retrieval function with minimal blast radius if misused by an AI agent—at worst, it could query balances of arbitrary addresses, which is a standard public blockchain read operation. No financial transactions are executed.
From the tool's definition Tool name 'get_flow_balance' and description 'Get the FLOW balance for a Flow address' indicate a read-only query operation with no side effects or modifications.
Attacks that exploit this kind of access
Get the FLOW balance for a Flow address on flow blockchain, the flow address is 16 characters long or 18 characters long with 0x prefix NOTE: This is a flow blockchin tool, not for flow EVM chain. It is categorised as a Read tool in the Flow MCP MCP Server, which means it retrieves data without modifying state.
Register the Flow MCP server in PolicyLayer and add a rule for get_flow_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. Nothing to install.
get_flow_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_flow_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_flow_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_flow_balance is provided by the Flow MCP server (outblock/flow-mcp-monorepo). 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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