generate_variants

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

Medium RISK CLASS

Category Write

Parameters 64 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/generate-variants.md

WHAT IT DOES

What generate_variants does on Mcp

AI agents use generate_variants 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
`prompt`	string	Yes	Required. The input text used to generate the variants.
`modelId`	string	—	Optional. The model to use for generation.
`projectId`	string	Yes	Required. The project ID of screens to generate variants for, example: '4044680601076201931', without the `projects/` prefix.
`deviceType`	string	—	Optional. The type of device that captured the screenshot, e.g., mobile or desktop.
`variantOptions`	object	Yes	Required. The variant options for generation, including the number of variants, creative range, and aspects to focus on.
`selectedScreenIds`	array	Yes	Required. The screen ids of screen to generate variants for, example: ['98b50e2ddc9943efb387052637738f61', '98b50e2ddc9943efb387052637738f62'], without the `scr

Parameters from the server's own tool schema.

RISK

Why generate_variants is rated Medium

An AI agent can call generate_variants faster than any human can review: one bad instruction and it creates or modifies resources in Mcp by the hundred, each call as confident as the last.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs generate_variants 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 generate_variants, this is the rule to start with:

generate_variants Rate-limited

generate_variants 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": {
    "generate_variants": {
      "limits": [
        {
          "counter": "generate_variants_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 generate_variants call is checked against it from then on.

FAQ

Questions about generate_variants

What does the generate_variants tool do? +

Generates variants of existing screens within a project using a text prompt. Instructions for Tool Call: * If the tool fails with a timeout, don't retry. Instead, try to get the screen with get_screen method every 30 seconds for up to 10 times before giving up. 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 generate_variants accept? +

generate_variants accepts 6 parameters: prompt, modelId, projectId, deviceType, variantOptions, selectedScreenIds. Required: prompt, projectId, variantOptions, selectedScreenIds. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on generate_variants? +

Register the MCP server in PolicyLayer and add a rule for generate_variants: 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 generate_variants? +

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

Can I rate-limit generate_variants? +

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

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

generate_variants 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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