Google Tag Manager / API Reference
gtm_build_custom_javascript_variable
Tool tool. Create a Custom JavaScript Variable in GTM. Args: account_id: The GTM account ID. container_id: The GTM container ID. workspace_id: The GTM workspace ID. js_code: JavaScript function body — must be a function() { return ...; } expression. name: Variable name.
This is a write tool: it builds custom javascript variable in your Google Tag Manager account. Claude asks you to confirm before it runs.
Ask Claude
You do not call this tool yourself. Ask for the outcome and the client picks the tool:
Build custom javascript variable in my Google Tag Manager account for [container id], [workspace id], [js code].
It takes 4 required and 1 optional parameter.
Parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
account_id | string | Yes | Account Id |
container_id | string | Yes | Container Id |
workspace_id | string | Yes | Workspace Id |
js_code | string | Yes | Js Code |
name | string | No | Name |
Related Google Tag Manager tools
gtm_build_custom_event_triggergtm_build_custom_html_taggtm_build_constant_variablegtm_build_conversion_linker_taggtm_build_datalayer_variablegtm_build_facebook_pixel_tag
Start free — 30 tool calls a month
No card required. Connect Google Ads, Meta Ads, GA4 or Search Console and ask Claude for the outcome — it picks the tool.