control_set_theme

Assign a Theme resource (res:// path) to a Control's 'theme' property so it and its children inherit it (undoable). Pass an empty theme_path to clear the override.

SERVERBreakpoint SOURCEbreakpoint-mcp

Medium RISK CLASS

Category Write

Parameters 22 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/breakpoint-mcp/control-set-theme.md

WHAT IT DOES

What control_set_theme does on Breakpoint

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

Parameter	Type	Required	Description
`path`	string	Yes	Control node path relative to the scene root
`theme_path`	string	Yes	Theme res:// path, or "" to clear the theme override

Parameters from the server's own tool schema.

RISK

Why control_set_theme is rated Medium

This tool creates or modifies a Control node's theme property, which affects visual presentation. The operation is explicitly described as 'undoable', confirming it is reversible and therefore a Write operation rather than Destructive. The severity is medium because modifying UI themes could affect application appearance and user experience, but the change is non-critical and can be undone.

From the tool's definition Tool description states 'Assign a Theme resource... to a Control's theme property' and 'undoable', indicating reversible modification of UI theme configuration.

Risk signalsAccepts file system path (path)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs control_set_theme safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Breakpoint, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For control_set_theme, this is the rule to start with:

control_set_theme Rate-limited

control_set_theme 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": {
    "control_set_theme": {
      "limits": [
        {
          "counter": "control_set_theme_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Breakpoint, apply this rule, and every control_set_theme call is checked against it from then on.

FAQ

Questions about control_set_theme

What does the control_set_theme tool do? +

Assign a Theme resource (res:// path) to a Control's 'theme' property so it and its children inherit it (undoable). Pass an empty theme_path to clear the override. It is categorised as a Write tool in the Breakpoint MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does control_set_theme accept? +

control_set_theme accepts 2 parameters: path, theme_path. Required: path, theme_path. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on control_set_theme? +

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

What risk level is control_set_theme? +

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

Can I rate-limit control_set_theme? +

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

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

control_set_theme is provided by the Breakpoint MCP server (breakpoint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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