get_upload_url

For clients that can upload bytes: returns a presigned PUT URL for a .glb (and optionally a PNG preview). Then call finalize_upload with the returned keys.

SERVER3dassets SOURCE3dassets-mcp

Low RISK CLASS

Category Read

Parameters 32 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/3dassets-mcp/get-upload-url.md

WHAT IT DOES

What get_upload_url does on 3dassets

AI agents call get_upload_url to retrieve information from 3dassets without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required
`filename`	string	Yes
`withPreview`	boolean	—
`contentLength`	integer	Yes

Parameters from the server's own tool schema.

RISK

Why get_upload_url is rated Low

Even though get_upload_url only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Risk signalsAccepts file system path (filename)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_upload_url safely

PolicyLayer is an MCP gateway: it sits between your AI agents and 3dassets, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_upload_url, this is the rule to start with:

get_upload_url Allowed

get_upload_url is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_upload_url": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect 3dassets, apply this rule, and every get_upload_url call is checked against it from then on.

FAQ

Questions about get_upload_url

What does the get_upload_url tool do? +

For clients that can upload bytes: returns a presigned PUT URL for a .glb (and optionally a PNG preview). Then call finalize_upload with the returned keys. It is categorised as a Read tool in the 3dassets MCP Server, which means it retrieves data without modifying state.

What parameters does get_upload_url accept? +

get_upload_url accepts 3 parameters: filename, withPreview, contentLength. Required: filename, contentLength. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on get_upload_url? +

Register the 3dassets MCP server in PolicyLayer and add a rule for get_upload_url: 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 3dassets. Nothing to install.

What risk level is get_upload_url? +

get_upload_url is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_upload_url? +

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

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

get_upload_url is provided by the 3dassets MCP server (3dassets-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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