Return the current pre-paid account balance in pence (GBP). Check this before placing large orders to ensure sufficient funds are available.
AI agents call get_balance to retrieve information from OpenPrints MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool merely queries and returns the current account balance state. It has no side effects, cannot modify data, and cannot commit financial transactions. While it touches financial data, it is a pure read operation with minimal blast radius if misused by an AI agent—at worst it could expose balance information.
From the tool's definition Tool name 'get_balance' and description 'Return the current pre-paid account balance' indicate a read-only query operation that retrieves financial information without modifying any data or triggering transactions.
Attacks that exploit this kind of access
Return the current pre-paid account balance in pence (GBP). Check this before placing large orders to ensure sufficient funds are available. It is categorised as a Read tool in the OpenPrints MCP MCP Server, which means it retrieves data without modifying state.
Register the OpenPrints 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 OpenPrints MCP. 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 OpenPrints MCP server (openprints/mcp). 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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