DeFi total-value-locked (TVL) via DefiLlama. No params → top protocols by TVL (name, category, TVL, 1d/7d change, chains) + total DeFi TVL. protocol=<slug> (e.g. lido, aave, uniswap) → one protocol; chain=<name> (e.g. ethereum, solana) → that chain\
AI agents call crypto.defi to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and queries DeFi protocol TVL data from an external source (DefiLlama) with optional filtering by protocol or chain name. It returns informational metrics only and has no parameters that allow creating, modifying, deleting, or executing transactions.
From the tool's definition Tool description states: "DeFi total-value-locked (TVL) via DefiLlama. No params → top protocols by TVL (name, category, TVL, 1d/7d change, chains) + total DeFi TVL.
Attacks that exploit this kind of access
DeFi total-value-locked (TVL) via DefiLlama. No params → top protocols by TVL (name, category, TVL, 1d/7d change, chains) + total DeFi TVL. protocol=<slug> (e.g. lido, aave, uniswap) → one protocol; chain=<name> (e.g. ethereum, solana) → that chain\. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for crypto.defi: 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 Mcp. Nothing to install.
crypto.defi 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 crypto.defi 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 crypto.defi. 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.
crypto.defi is provided by the MCP server (@2sio/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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