get_user_credit_balance
AI agents call get_user_credit_balance to retrieve information from Nebulablock without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves user credit balance data with no side effects. While it touches financial data, it performs only a Read operation (query) rather than executing payments or modifying balances. It poses minimal risk if misused—an agent could discover account balance but not alter it. Severity is low because it retrieves non-sensitive operational metrics available within the user's own account context.
From the tool's definition Tool name 'get_user_credit_balance' indicates retrieval of credit/financial balance information without modification. Description is empty, but the name and context of sibling tools (payment_history, api_keys, instances) confirm this is a query-only operation.
Attacks that exploit this kind of access
get_user_credit_balance. It is categorised as a Read tool in the Nebulablock MCP Server, which means it retrieves data without modifying state.
Register the Nebulablock MCP server in PolicyLayer and add a rule for get_user_credit_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 Nebulablock. Nothing to install.
get_user_credit_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_user_credit_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_user_credit_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_user_credit_balance is provided by the Nebulablock MCP server (nebula-block-data/nebulablock-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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