yield_reserve_check_token_permission

THE RISK

Low Risk

Why yield_reserve_check_token_permission needs a policy

This tool performs a read-only lookup of token permissions in the Yield Reserve system. It retrieves information about which tokens are enabled for swapping but does not create, modify, delete, or execute any operations. The query returns existing permission state data.

From the tool's definition Tool description states it 'check[s] if a token is allowed' — a query operation that retrieves permission status without modifying state or executing external operations. No side effects indicated.

Documented attack patterns abuse exactly the kind of access yield_reserve_check_token_permission gives an agent:

POLICY

How to control yield_reserve_check_token_permission

PolicyLayer is an MCP gateway — it sits between your AI agents and Sperax Ecosystem Crypto & DeFI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for yield_reserve_check_token_permission:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "yield_reserve_check_token_permission": {}
  }
}

yield_reserve_check_token_permission is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Sperax Ecosystem Crypto & DeFI MCP Server — nothing to install.
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Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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FAQ

Questions about yield_reserve_check_token_permission

What does the yield_reserve_check_token_permission tool do? +

Check if a token is allowed for swapping in the Yield Reserve. Tokens can be enabled as source (input) or destination (output) tokens. It is categorised as a Read tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on yield_reserve_check_token_permission? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for yield_reserve_check_token_permission: 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 Sperax Ecosystem Crypto & DeFI MCP Server. Nothing to install.

What risk level is yield_reserve_check_token_permission? +

yield_reserve_check_token_permission is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit yield_reserve_check_token_permission? +

Yes. Add a rate_limit block to the yield_reserve_check_token_permission 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 yield_reserve_check_token_permission completely? +

Set action: deny in the PolicyLayer policy for yield_reserve_check_token_permission. 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 yield_reserve_check_token_permission? +

yield_reserve_check_token_permission is provided by the Sperax Ecosystem Crypto & DeFI MCP Server MCP server (sperax/sperax-crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Sperax Ecosystem Crypto & DeFI MCP Server tool call.

Start from Sperax Ecosystem Crypto & DeFI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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