stop_streaming · PicoScope MCP Server MCP: Risk & Policy

WHAT IT DOES

What stop_streaming does on PicoScope MCP Server

AI agents invoke stop_streaming to trigger actions in PicoScope 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 stop_streaming needs a policy

This tool executes a command that changes the state of an external device (the oscilloscope), stopping an active operation. While not destructive (the data is not deleted or overwritten) and not financial, it qualifies as Execute because it triggers an external operation whose effects depend on context—specifically, it terminates a live data stream.

From the tool's definition stop_streaming stops an active data acquisition operation on a PicoScope oscilloscope device. The tool name and description indicate it triggers a control action that halts an ongoing external operation (streaming from the oscilloscope hardware).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stop_streaming Rate-limited

stop_streaming 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": {
    "stop_streaming": {
      "limits": [
        {
          "counter": "stop_streaming_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 PicoScope MCP Server, so you can run agents against it safely.

FAQ

Questions about stop_streaming

What does the stop_streaming tool do? +

Stop streaming data acquisition. It is categorised as a Execute tool in the PicoScope 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 stop_streaming? +

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

What risk level is stop_streaming? +

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

Can I rate-limit stop_streaming? +

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

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

stop_streaming is provided by the PicoScope MCP Server MCP server (markuskreitzer/picoscope_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.