upload_media_base64
Upload an image to the media library from a base64 data URI. Returns the CDN URL.
This record as markdown: /tools/webcake-storefront/upload-media-base64.md
What upload_media_base64 does on Webcake Storefront
AI agents use upload_media_base64 to create or update resources in Webcake Storefront, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Webcake Storefront environment.
Why upload_media_base64 is rated Medium
The tool creates/adds data (image upload to media library) without irreversible deletion, code execution, or financial impact. This fits the Write category. Severity is medium because uncontrolled uploads could fill storage, introduce malicious images, or facilitate defacement, but the impact is confined to the media library and reversible.
From the tool's definition Tool description states 'Upload an image to the media library' — this creates a new media asset in the system and returns a CDN URL. The action is reversible (media can be deleted), and does not execute arbitrary code or trigger destructive operations.
Attacks that exploit this kind of access
The rule that runs upload_media_base64 safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Webcake Storefront, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For upload_media_base64, this is the rule to start with:
upload_media_base64 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Webcake Storefront, apply this rule, and every upload_media_base64 call is checked against it from then on.
Questions about upload_media_base64
Upload an image to the media library from a base64 data URI. Returns the CDN URL. It is categorised as a Write tool in the Webcake Storefront MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Webcake Storefront MCP server in PolicyLayer and add a rule for upload_media_base64: 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 Webcake Storefront. Nothing to install.
upload_media_base64 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_media_base64 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_media_base64. 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_media_base64 is provided by the Webcake Storefront MCP server (webcake-storefront-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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