create_design_system

SERVERMcp SOURCEhttps://stitch.googleapis.com/mcp

Medium RISK CLASS

Category Write

Parameters 21 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/com-googleapis-stitch-mcp/create-design-system.md

WHAT IT DOES

What create_design_system does on Mcp

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

Parameter	Type	Required	Description
`projectId`	string	—	Optional. The project ID to create design system for, example: '4044680601076201931', without the `projects/` prefix. If empty, creates a global asset (not asso
`designSystem`	object	Yes	Required. The design system to create.

Parameters from the server's own tool schema.

RISK

Why create_design_system is rated Medium

This tool creates and modifies design system configuration data (colors, fonts, shapes, themes) which constitutes reversible data creation/modification. It does not execute arbitrary code, delete data irreversibly, move money, or query existing data without side effects. The blast radius is limited to design/UI configuration changes that can be undone or modified later.

From the tool's definition Tool description states it 'Creates a new design system' and 'establishes the foundational design tokens that apply across all screens in the project.' The operations described (configuring color palette, typography, shape, appearance, and design…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_design_system safely

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

create_design_system Rate-limited

create_design_system 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": {
    "create_design_system": {
      "limits": [
        {
          "counter": "create_design_system_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 Mcp, apply this rule, and every create_design_system call is checked against it from then on.

FAQ

Questions about create_design_system

What does the create_design_system tool do? +

Creates a new design system for a project. Use this tool when the user wants to set or update the overall visual theme, style, or branding of the application. This includes configuring: - Color Palette: Presets, custom primary colors, and saturation levels. - Typography: Font families (e.g., Inter, Roboto, etc.). - Shape: Corner roundness for UI elements. - Appearance: Light and dark mode background colors. - Design MD: Free-form design instructions in markdown. This tool establishes the foundational design tokens that apply across all screens in the project. Instructions for Tool Call: * Call update_design_system tool immediately after this tool to apply the design system to the project, and display the design system in the UI. It is categorised as a Write tool in the Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does create_design_system accept? +

create_design_system accepts 2 parameters: projectId, designSystem. Required: designSystem. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on create_design_system? +

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

What risk level is create_design_system? +

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

Can I rate-limit create_design_system? +

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

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

create_design_system is provided by the MCP server (https://stitch.googleapis.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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