Check your current credit balance and subscription plan.
AI agents call credits.check_balance to retrieve information from Kelnix Receipt Mcp Api without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that queries the user's current credit balance and subscription status. It has no side effects, does not execute code, does not modify data, and does not involve financial transactions—it merely retrieves existing billing information for display purposes. The blast radius of misuse is minimal: an attacker could only view the user's credit balance, not spend credits or alter the account.
From the tool's definition Tool name 'credits.check_balance' and description 'Check your current credit balance and subscription plan' indicate a query operation that retrieves account/billing information without modifying or executing anything.
Attacks that exploit this kind of access
Check your current credit balance and subscription plan. It is categorised as a Read tool in the Kelnix Receipt Mcp Api MCP Server, which means it retrieves data without modifying state.
Register the Kelnix Receipt Mcp Api MCP server in PolicyLayer and add a rule for credits.check_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 Kelnix Receipt Mcp Api. Nothing to install.
credits.check_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 credits.check_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 credits.check_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.
credits.check_balance is provided by the Kelnix Receipt Mcp Api MCP server (kelnixsolutions/kelnix-receipt-mcp-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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