set_tbar_position

THE RISK

High Risk

This tool triggers an external operation in OBS Studio — adjusting the T-bar (transition bar) position, which controls a live transition between scenes. It is not a simple data write but an action that affects the live broadcast state. Misuse could cause unintended on-air transitions, but the blast radius is relatively low (reversible, limited to visual output).

From the tool's definition Sets the position of the transition bar. tbar_position: Position to set the T-bar to (0.0-1.0)

Documented attack patterns abuse exactly the kind of access set_tbar_position gives an agent:

HOW TO CONTROL SET_TBAR_POSITION

PolicyLayer is an MCP gateway — it sits between your AI agents and OBS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for set_tbar_position:

policy.json

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

set_tbar_position 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.

Create a free account and register OBS MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

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EXPLORE

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High-risk tools in OBS MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the set_tbar_position tool do? +

Sets the position of the transition bar. Args: tbar_position: Position to set the T-bar to (0.0-1.0). It is categorised as a Execute tool in the OBS 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 set_tbar_position? +

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

What risk level is set_tbar_position? +

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

Can I rate-limit set_tbar_position? +

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

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

set_tbar_position is provided by the OBS MCP Server MCP server (royshil/obs-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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// WHAT SET_TBAR_POSITION ON OBS MCP SERVER DOES

// THE RISK

// HOW TO CONTROL SET_TBAR_POSITION

// EXPLORE