compose_components · its-just-ui MCP Server MCP

WHAT IT DOES

What compose_components does on its-just-ui MCP Server

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

WHY IT NEEDS A POLICY

Why compose_components needs a policy

This tool falls into the Write category because it creates and modifies component compositions reversibly. While it generates UI structures, these are not irreversibly deleted, nor do they execute arbitrary code or trigger financial transactions.

From the tool's definition The tool name is 'compose_components' and it creates a composition of multiple components, which involves creating or assembling new UI component structures. This is a generative/creative operation that modifies the component state or creates new compositions.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

compose_components Rate-limited

compose_components 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": {
    "compose_components": {
      "limits": [
        {
          "counter": "compose_components_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 its-just-ui MCP Server, so you can run agents against it safely.

FAQ

Questions about compose_components

What does the compose_components tool do? +

Create a composition of multiple its-just-ui components. It is categorised as a Write tool in the its-just-ui 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 compose_components? +

Register the its-just-ui MCP Server MCP server in PolicyLayer and add a rule for compose_components: 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 its-just-ui MCP Server. Nothing to install.

What risk level is compose_components? +

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

Can I rate-limit compose_components? +

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

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

compose_components is provided by the its-just-ui MCP Server MCP server (its-just-ui/its-just-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.