vicon_set_buffer_size · Vicon DataStream MCP Server MCP

WHAT IT DOES

What vicon_set_buffer_size does on Vicon DataStream MCP Server

AI agents use vicon_set_buffer_size to create or update resources in Vicon DataStream MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Vicon DataStream MCP Server environment.

WHY IT NEEDS A POLICY

Why vicon_set_buffer_size needs a policy

This tool modifies a configuration parameter (buffer size) on the Vicon motion capture system. It is a reversible write operation that changes how data is buffered during streaming. While it doesn't destroy data or execute arbitrary code, it does alter system state.

From the tool's definition Tool name 'vicon_set_buffer_size' and description indicating configuration of client buffer size (frame count) — modifies system parameters that affect data streaming behavior.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vicon_set_buffer_size Rate-limited

vicon_set_buffer_size stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "vicon_set_buffer_size": {
      "limits": [
        {
          "counter": "vicon_set_buffer_size_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about vicon_set_buffer_size

What does the vicon_set_buffer_size tool do? +

设置客户端缓冲区大小（帧数）. It is categorised as a Write tool in the Vicon DataStream MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on vicon_set_buffer_size? +

Register the Vicon DataStream MCP Server MCP server in PolicyLayer and add a rule for vicon_set_buffer_size: 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 Vicon DataStream MCP Server. Nothing to install.

What risk level is vicon_set_buffer_size? +

vicon_set_buffer_size is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit vicon_set_buffer_size? +

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

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

vicon_set_buffer_size is provided by the Vicon DataStream MCP Server MCP server (ros-claw/vicon-datastream-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.