Register a design image URL with OpenPrints. Returns a design_id that can be reused across multiple orders without re-uploading. Use this before create_order if you want to reference the same design multiple times.
AI agents use upload_design to create or update resources in OpenPrints MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your OpenPrints MCP environment.
The tool creates/registers new data (a design record) in the OpenPrints backend, making it a Write operation. It is reversible (designs can presumably be deleted or replaced), so it does not qualify as Destructive.
From the tool's definition Tool description states 'Register a design image URL' and 'Returns a design_id that can be reused across multiple orders'. This creates a persistent data record (the design registration) that is stored in the OpenPrints system.
Attacks that exploit this kind of access
Register a design image URL with OpenPrints. Returns a design_id that can be reused across multiple orders without re-uploading. Use this before create_order if you want to reference the same design multiple times. It is categorised as a Write tool in the OpenPrints MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the OpenPrints MCP server in PolicyLayer and add a rule for upload_design: 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 OpenPrints MCP. Nothing to install.
upload_design is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the upload_design 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.
Set action: deny in the PolicyLayer policy for upload_design. 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.
upload_design is provided by the OpenPrints MCP server (openprints/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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