AI agents call get_claimable_rewards 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 information about available rewards from merkle airdrop distributors. It performs a read-only query against the blockchain to determine what rewards a user can claim, but does not execute any transactions, modify state, or delete data.
From the tool's definition Tool name 'get_claimable_rewards' and description 'Scan all JustLend V1 merkle airdrop distributors for a user' indicate data retrieval only. The verb 'scan' and 'get' are query operations with no modification or execution of transactions.
Attacks that exploit this kind of access
Scan all JustLend V1 merkle airdrop distributors for a user. 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_claimable_rewards: 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_claimable_rewards 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_claimable_rewards 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_claimable_rewards. 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_claimable_rewards 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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