# append_site_custom_code

Append or prepend code to a custom code field WITHOUT reading the existing content first. Use this when you need to ADD new CSS rules, JS code, or script tags — no need to read first. For full rewrites, use update_site_custom_code instead.

Agent View of the PolicyLayer registry record for `append_site_custom_code`. HTML page: https://policylayer.com/tools/webcake-storefront/append-site-custom-code

## Facts

- Tool: `append_site_custom_code`
- Server: Webcake Storefront (`webcake-storefront-mcp`) — https://policylayer.com/tools/webcake-storefront.md
- Install: `npx -y webcake-storefront-mcp`
- Homepage: git+https://github.com/vuluu2k/webcake-storefront-mcp.git
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "append_site_custom_code",
    "arguments": {}
  }
}
```

## Why append_site_custom_code is rated Medium

append_site_custom_code creates or modifies site code (CSS/JS/scripts) without deletion capability, fitting the Write category. Severity is high because injecting arbitrary JavaScript or CSS into a live storefront can deface pages, steal customer data, or break functionality. However, it does not delete data (thus not Destructive) or directly move money (thus not Financial).

From the tool's own definition: "Tool appends code to custom code fields, modifying site content with CSS, JS, and script tags. The description explicitly states 'ADD new CSS rules, JS code, or script tags' — this is creating or modifying data."

## Use case

AI agents use append_site_custom_code 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.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Webcake Storefront:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "append_site_custom_code": {
      "limits": [
        {
          "counter": "append_site_custom_code_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Webcake Storefront (286)

- `clear_page_draft` — Destructive — https://policylayer.com/tools/webcake-storefront/clear-page-draft.md
- `delete_affiliate_accounts` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-affiliate-accounts.md
- `delete_affiliate_products` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-affiliate-products.md
- `delete_appointment_addresses` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-appointment-addresses.md
- `delete_appointment_calendars` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-appointment-calendars.md
- `delete_appointment_classifies` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-appointment-classifies.md
- `delete_appointment_employees` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-appointment-employees.md
- `delete_article` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-article.md
- `delete_automation` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-automation.md
- `delete_collection` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-collection.md
- `delete_contacts` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-contacts.md
- `delete_course` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-course.md
- `delete_courses` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-courses.md
- `delete_domain` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-domain.md
- `delete_employees` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-employees.md
- `delete_global_section` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-global-section.md
- `delete_global_source` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-global-source.md
- `delete_page` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-page.md
- `delete_partner_feeds` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-partner-feeds.md
- `delete_product` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-product.md
- `delete_product_category` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-product-category.md
- `delete_redirect_urls` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-redirect-urls.md
- `delete_saved_filter` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-saved-filter.md
- `delete_site_utms` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-site-utms.md
- `delete_subscribers` — Destructive — https://policylayer.com/tools/webcake-storefront/delete-subscribers.md
- `empty_media_trash` — Destructive — https://policylayer.com/tools/webcake-storefront/empty-media-trash.md
- `remove_font` — Destructive — https://policylayer.com/tools/webcake-storefront/remove-font.md
- `remove_font_group` — Destructive — https://policylayer.com/tools/webcake-storefront/remove-font-group.md
- `remove_reviews` — Destructive — https://policylayer.com/tools/webcake-storefront/remove-reviews.md
- `unblock_all_phone_customers` — Destructive — https://policylayer.com/tools/webcake-storefront/unblock-all-phone-customers.md
- …and 256 more: https://policylayer.com/tools/webcake-storefront.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=webcake-storefront · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/webcake-storefront