claim_strx_rewards · Justlend MCP: Risk & Policy

WHAT IT DOES

What claim_strx_rewards does on Justlend

AI agents use claim_strx_rewards to commit financial operations through Justlend — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why claim_strx_rewards needs a policy

Claiming staking rewards involves moving cryptocurrency assets (sTRX rewards) to the caller's wallet, which constitutes a financial operation on the TRON blockchain. While it doesn't transfer funds out of the user's own holdings, it commits/transfers financial assets (staking rewards) to the user, making it a financial transaction. Misuse could trigger unintended on-chain financial transactions.

From the tool's definition Claim all available sTRX staking rewards

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

claim_strx_rewards Approval-gated

Any call to claim_strx_rewards is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "claim_strx_rewards": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Justlend, so you can run agents against it safely.

FAQ

Questions about claim_strx_rewards

What does the claim_strx_rewards tool do? +

Claim all available sTRX staking rewards. It is categorised as a Financial tool in the Justlend MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on claim_strx_rewards? +

Register the Justlend MCP server in PolicyLayer and add a rule for claim_strx_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.

What risk level is claim_strx_rewards? +

claim_strx_rewards is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit claim_strx_rewards? +

Yes. Add a rate_limit block to the claim_strx_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.

How do I block claim_strx_rewards completely? +

Set action: deny in the PolicyLayer policy for claim_strx_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.

What MCP server provides claim_strx_rewards? +

claim_strx_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.