vicon_add_subject_filter · Vicon DataStream MCP Server MCP

WHAT IT DOES

What vicon_add_subject_filter does on Vicon DataStream MCP Server

AI agents use vicon_add_subject_filter 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_add_subject_filter needs a policy

This tool modifies the subject filter configuration, which is a reversible change to how the motion capture system routes data. It does not delete data (Destructive), execute arbitrary code (Execute), cause financial impact (Financial), or merely read data (Read). The action is reversible through vicon_clear_subject_filter (a sibling tool), making it a Write operation.

From the tool's definition Tool name 'vicon_add_subject_filter' and description 'Add subject to filter (only receive specified subject)' indicates modification of filter configuration state. This creates or modifies filtering rules applied to data streams.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vicon_add_subject_filter Rate-limited

vicon_add_subject_filter 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_add_subject_filter": {
      "limits": [
        {
          "counter": "vicon_add_subject_filter_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_add_subject_filter

What does the vicon_add_subject_filter tool do? +

添加主体到过滤器（只接收指定主体）. 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_add_subject_filter? +

Register the Vicon DataStream MCP Server MCP server in PolicyLayer and add a rule for vicon_add_subject_filter: 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_add_subject_filter? +

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

Can I rate-limit vicon_add_subject_filter? +

Yes. Add a rate_limit block to the vicon_add_subject_filter 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_add_subject_filter completely? +

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

vicon_add_subject_filter 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.