td_set_params · Td MCP: Risk & Policy

WHAT IT DOES

What td_set_params does on Td

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

WHY IT NEEDS A POLICY

Why td_set_params needs a policy

This tool modifies operator parameters in TouchDesigner. It writes/updates configuration data on existing operators. This is reversible (parameters can be changed back), so Write is appropriate rather than Destructive. Misuse could corrupt operator behavior in a running TD project, hence medium severity.

From the tool's definition Set multiple parameters on an operator in a single batch call

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

td_set_params Rate-limited

td_set_params 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": {
    "td_set_params": {
      "limits": [
        {
          "counter": "td_set_params_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 Td, so you can run agents against it safely.

FAQ

Questions about td_set_params

What does the td_set_params tool do? +

Set multiple parameters on an operator in a single batch call. It is categorised as a Write tool in the Td MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on td_set_params? +

Register the Td MCP server in PolicyLayer and add a rule for td_set_params: 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 Td. Nothing to install.

What risk level is td_set_params? +

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

Can I rate-limit td_set_params? +

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

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

td_set_params is provided by the Td MCP server (tai5863/td-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.