AI agents call get_all_markets to retrieve information from Justlend without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries market data from JustLend DAO without making any changes to state, executing code, or committing financial transactions. It is a pure read operation that gathers informational metrics about lending markets. The minimal blast radius reflects that an AI agent's misuse would only result in reading unnecessary or repetitive data, not harm to assets or systems.
From the tool's definition Tool name 'get_all_markets' and description 'Get overview data for ALL JustLend markets including supply APY, borrow APY, mining rewards APY' indicate a data retrieval operation with no modification or execution capability.
Attacks that exploit this kind of access
Get overview data for ALL JustLend markets including supply APY, borrow APY, mining rewards APY,. It is categorised as a Read tool in the Justlend MCP Server, which means it retrieves data without modifying state.
Register the Justlend MCP server in PolicyLayer and add a rule for get_all_markets: 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 Justlend. Nothing to install.
get_all_markets 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_all_markets 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_all_markets. 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_all_markets is provided by the Justlend MCP server (justlend/mcp-server-justlend). 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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