upload_design_md

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

Medium RISK CLASS

Category Write

Parameters 22 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/upload-design-md.md

WHAT IT DOES

What upload_design_md does on Mcp

AI agents use upload_design_md 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	Yes	Required. The project ID to upload the DESIGN.md to, example: '4044680601076201931', without the `projects/` prefix.
`designMdBase64`	string	Yes	Required. The base64-encoded DESIGN.md content. The decoded content must be valid UTF-8; uploads with invalid UTF-8 bytes will be rejected. Run `base64 -w 0 ` t

Parameters from the server's own tool schema.

RISK

Why upload_design_md is rated Medium

The tool performs a write operation by uploading a file to a project. It is reversible (can be deleted or overwritten) and does not delete data or execute arbitrary code. The severity is low because design system files are typically configuration/documentation artifacts with limited blast radius if misused—the worst case would be overwriting a design system definition, which is recoverable.

From the tool's definition Uploads DESIGN.md to a Stitch project. This is a file upload operation that creates or modifies project data (the DESIGN.md file within the project).

Attacks that exploit this kind of access

RECOMMENDED RULE

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

upload_design_md Rate-limited

upload_design_md 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": {
    "upload_design_md": {
      "limits": [
        {
          "counter": "upload_design_md_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 upload_design_md call is checked against it from then on.

FAQ

Questions about upload_design_md

What does the upload_design_md tool do? +

Uploads DESIGN.md to a Stitch project. Use this tool when the user wants to create a design system from a DESIGN.md file. Instructions for Tool Call: * Call create_design_system_from_design_md tool immediately after this tool to create the design system from the uploaded DESIGN.md, 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 upload_design_md accept? +

upload_design_md accepts 2 parameters: projectId, designMdBase64. Required: projectId, designMdBase64. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on upload_design_md? +

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

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

Can I rate-limit upload_design_md? +

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

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

upload_design_md 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.

KEEP EXPLORING

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