Custom Code Management

Concepts

Webflow custom code: register (store script) → apply (attach to site). Inline scripts only via MCP (max 10,000 chars).

Important note

ALWAYS use Webflow MCP tools for all operations: Use the following tools for all operations:

• data_scripts_tool with actions list_registered_scripts / list_applied_scripts

• List scripts

• data_scripts_tool with action add_inline_site_script

• Register inline script (no <script> tags)

• data_scripts_tool with action delete_all_site_scripts

• Remove ALL scripts (no selective delete)

• data_sites_tool with action list_sites

• List available sites

Instructions

View Scripts

• Call data_sites_tool with action list_sites if needed, then call both list tools in parallel

• Display registration and application status

Add Script

• Gather: name, code, location (header/footer)

• Validate: under 10,000 chars, no <script> tags

• Preview with character count, require "add" to confirm

• Call data_scripts_tool with action add_inline_site_script with displayName, sourceCode, version, location, canCopy

• Remind user to publish

Remove Scripts

• List current scripts

• Warn: removes ALL scripts (no selective delete)

• Require "delete all" to confirm

• Remind user to publish

Constraints

• Max 10,000 characters per script

• Do NOT include <script> tags (Webflow adds them)

• displayName + version must be unique

• Site-level only (no page-specific via MCP)

• Hosted scripts not available via MCP

Response Format

After adding a script, respond with the script name, location, and version. Suggest using the safe-publish skill to publish changes.