startStreamingTool · Beep MCP Server MCP: Risk & Policy

WHAT IT DOES

What startStreamingTool does on Beep MCP Server

AI agents invoke startStreamingTool to trigger actions in Beep MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why startStreamingTool needs a policy

This tool triggers an external operation (streaming initiation) that has real-world consequences on the Beep network. While it does not directly move money like 'issuePayment' (Financial category), it activates a streaming session tied to financial transactions (invoices). The effect is deterministic but depends on the argument (which invoice), making it Execute category.

From the tool's definition Tool description states it 'Starts the streaming for the given invoice'. The tool initiates a streaming process tied to a financial invoice on the Beep platform, which is an external operation with effects that depend on the invoice argument provided.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

startStreamingTool Rate-limited

startStreamingTool stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "startStreamingTool": {
      "limits": [
        {
          "counter": "startstreamingtool_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about startStreamingTool

What does the startStreamingTool tool do? +

Starts the streaming for the given invoice. It is categorised as a Execute tool in the Beep MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on startStreamingTool? +

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

What risk level is startStreamingTool? +

startStreamingTool is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit startStreamingTool? +

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

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

startStreamingTool is provided by the Beep MCP Server MCP server (lamdanghoang/beep-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.