Get a presigned URL for fast direct image uploads. Returns: - uploadUrl: POST your image file here directly - publicUrl: Use this URL in your slides after upload This is MUCH faster than base64 encoding. Upload directly to storage.
AI agents call get_upload_url to retrieve information from Makeslates without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves a presigned URL — it does not itself upload or store any data. The act of fetching a URL is a read operation with no side effects on its own. The actual upload would be a separate action by the caller using the returned URL. Severity is low since misuse only yields a URL, not direct data exfiltration or modification.
From the tool's definition Get a presigned URL for fast direct image uploads. Returns: uploadUrl, publicUrl
Attacks that exploit this kind of access
Get a presigned URL for fast direct image uploads. Returns: - uploadUrl: POST your image file here directly - publicUrl: Use this URL in your slides after upload This is MUCH faster than base64 encoding. Upload directly to storage. It is categorised as a Read tool in the Makeslates MCP Server, which means it retrieves data without modifying state.
Register the Makeslates 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 Makeslates. Nothing to install.
get_upload_url is a Read tool with low risk. Read-only tools are generally safe to allow by default.
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.
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.
get_upload_url is provided by the Makeslates MCP server (makeslates-mcp-server). 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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