Get detailed information about your Yearn vault positions (uses address from private key in environment)
AI agents call getUserYearnPositions to retrieve information from Katana MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves existing data about Yearn vault positions without creating, modifying, deleting, or executing any financial transactions. It is purely informational. While the broader server context involves financial operations (DeFi, trading, bridging), this specific tool is read-only.
From the tool's definition Tool name 'getUserYearnPositions' and description state it 'Get[s] detailed information about your Yearn vault positions' — a retrieval operation with no modification or execution of transactions.
Attacks that exploit this kind of access
Get detailed information about your Yearn vault positions (uses address from private key in environment). It is categorised as a Read tool in the Katana MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Katana MCP Server MCP server in PolicyLayer and add a rule for getUserYearnPositions: 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 Katana MCP Server. Nothing to install.
getUserYearnPositions 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 getUserYearnPositions 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 getUserYearnPositions. 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.
getUserYearnPositions is provided by the Katana MCP Server MCP server (playainetwork/katana_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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