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

1. Call data_sites_tool with action list_sites if needed, then call both list tools in parallel
2. Display registration and application status

Add Script

1. Gather: name, code, location (header/footer)
2. Validate: under 10,000 chars, no <script> tags
3. Preview with character count, require “add” to confirm
4. Call data_scripts_tool with action add_inline_site_script with displayName, sourceCode, version, location, canCopy
5. Remind user to publish

Remove Scripts

1. List current scripts
2. Warn: removes ALL scripts (no selective delete)
3. Require “delete all” to confirm
4. 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.