subscribe · Sablier MCP Server MCP: Risk & Policy

WHAT IT DOES

What subscribe does on Sablier MCP Server

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

WHY IT NEEDS A POLICY

Why subscribe needs a policy

The tool name 'subscribe' strongly implies a financial subscription commitment. The server context — portfolio analysis, SEC filings, credit packs — further suggests this tool likely initiates a recurring financial obligation.

From the tool's definition Tool name is 'subscribe' on a server described as handling portfolios, market analysis, and financial operations; also a sibling tool 'buy_credit_pack' suggests financial transactions occur on this server

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

subscribe Approval-gated

Any call to subscribe 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": {
    "subscribe": {
      "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 Sablier MCP Server, so you can run agents against it safely.

FAQ

Questions about subscribe

What does the subscribe tool do? +

subscribe. It is categorised as a Financial tool in the Sablier MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on subscribe? +

Register the Sablier MCP Server MCP server in PolicyLayer and add a rule for subscribe: 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 Sablier MCP Server. Nothing to install.

What risk level is subscribe? +

subscribe 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 subscribe? +

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

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

subscribe is provided by the Sablier MCP Server MCP server (sablier-ai/sablier-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.