set_image_alts

SERVERWebcake Storefront SOURCEwebcake-storefront-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/webcake-storefront/set-image-alts.md

WHAT IT DOES

What set_image_alts does on Webcake Storefront

AI agents use set_image_alts 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.

RISK

Why set_image_alts is rated Medium

The tool creates or modifies alt text metadata for images, which is a reversible change to page content. This is a Write operation because it updates existing data (alt attributes) without deleting or destroying anything.

From the tool's definition Tool description states "Batch-write alt text for image elements" and "each source is fetched + saved exactly once", indicating modification of data (alt text attributes) across multiple pages and sources.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

set_image_alts Rate-limited

set_image_alts 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": {
    "set_image_alts": {
      "limits": [
        {
          "counter": "set_image_alts_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 Webcake Storefront, apply this rule, and every set_image_alts call is checked against it from then on.

FAQ

Questions about set_image_alts

What does the set_image_alts tool do? +

Batch-write alt text for image elements across pages + global sources. Groups updates by source so each source is fetched + saved exactly once. Workflow: list_image_elements → read_image (per src) → describe → set_image_alts(items). If alt_path is omitted, it is auto-detected via the same probe used by list_image_elements (config.image.alt → config.alt → specials.alt). 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.

How do I enforce a policy on set_image_alts? +

Register the Webcake Storefront MCP server in PolicyLayer and add a rule for set_image_alts: 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.

What risk level is set_image_alts? +

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

Can I rate-limit set_image_alts? +

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

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

set_image_alts 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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