granite_add_collateral · Stacks AI MCP Server MCP

WHAT IT DOES

What granite_add_collateral does on Stacks AI MCP Server

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

WHY IT NEEDS A POLICY

Why granite_add_collateral needs a policy

This tool moves real financial assets (sBTC/Bitcoin) into a DeFi lending protocol as collateral. It commits funds on-chain in a way that affects borrowing capacity and exposes those assets to liquidation risk. This is a financial operation with significant monetary consequences if misused by an AI agent.

From the tool's definition Deposit BTC (sBTC) as collateral to enable borrowing

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

granite_add_collateral Approval-gated

Any call to granite_add_collateral 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": {
    "granite_add_collateral": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about granite_add_collateral

What does the granite_add_collateral tool do? +

Deposit BTC (sBTC) as collateral to enable borrowing. It is categorised as a Financial tool in the Stacks AI MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on granite_add_collateral? +

Register the Stacks AI MCP Server MCP server in PolicyLayer and add a rule for granite_add_collateral: 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 Stacks AI MCP Server. Nothing to install.

What risk level is granite_add_collateral? +

granite_add_collateral 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 granite_add_collateral? +

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

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

granite_add_collateral is provided by the Stacks AI MCP Server MCP server (stack-ai-mcp/stacks-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.