Return balance with hold/available breakdowns per asset.
AI agents call get_extended_balance to retrieve information from Mcp Kraken without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves financial account data (balance breakdowns) but does not move money, create/modify orders, delete data, or execute trades. It is a read-only query operation with no side effects. The sibling tools (add_order, cancel_order, account_transfer, etc.) perform write/destructive/financial actions, but this tool is clearly limited to data retrieval.
From the tool's definition Tool name 'get_extended_balance' and description 'Return balance with hold/available breakdowns per asset' indicate a query operation that retrieves account balance information without modifying, deleting, or executing external operations.
Attacks that exploit this kind of access
Return balance with hold/available breakdowns per asset. It is categorised as a Read tool in the Mcp Kraken MCP Server, which means it retrieves data without modifying state.
Register the Mcp Kraken MCP server in PolicyLayer and add a rule for get_extended_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 Mcp Kraken. Nothing to install.
get_extended_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_extended_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_extended_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_extended_balance is provided by the Mcp Kraken MCP server (xavierbeheydt/mcp-kraken). 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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