mcp-gtm

mcp-gtm

Enables LLMs to manage Google Tag Manager containers through exported JSON files, with full CRUD operations on tags, triggers, variables, and folders, plus validation and analysis tools.

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README

mcp-gtm

An MCP (Model Context Protocol) server that lets LLMs interact with Google Tag Manager through exported JSON container files. Zero auth setup, fully offline.

Quick Start

npm install
npm run dev

Or configure in your MCP client:

{
  "mcpServers": {
    "gtm": {
      "command": "npx",
      "args": ["tsx", "/path/to/mcp-gtm/src/index.ts"],
      "env": {
        "GTM_CONTAINER_FILE": "/path/to/your-container.json"
      }
    }
  }
}

Tools (41 total)

Tool Description
gtm_load_container Load a GTM container JSON file
gtm_get_container_info Get container metadata
gtm_get_container_state Get summary counts
gtm_list_tags List all tags
gtm_get_tag Get tag by ID or name
gtm_create_tag Create a new tag
gtm_update_tag Update an existing tag
gtm_delete_tag Delete a tag
gtm_find_tags_by_type Find tags by type (e.g. gaawe)
gtm_list_triggers List all triggers
gtm_get_trigger Get trigger by ID or name
gtm_create_trigger Create a new trigger
gtm_update_trigger Update a trigger
gtm_delete_trigger Delete a trigger
gtm_list_variables List user-defined variables
gtm_get_variable Get variable details
gtm_create_variable Create a variable
gtm_update_variable Update a variable
gtm_delete_variable Delete a variable
gtm_list_builtin_variables List built-in variables
gtm_list_folders List folders
gtm_get_folder Get folder details
gtm_create_folder Create a new folder
gtm_delete_folder Delete a folder
gtm_move_tag_to_folder Move a tag to/from a folder
gtm_get_tag_dependencies Show tag trigger dependencies
gtm_find_unused_entities Find unused tags/triggers/variables
gtm_find_orphaned_triggers Find triggers not used by any tag
gtm_validate_container Run full Zod validation
gtm_export_container Export container state to JSON
gtm_diff_containers Compare two container files

Resources (4 total)

Read-only MCP resources for container state snapshots:

Resource URI Description
container_state gtm://container/state Entity counts and metadata
container_tags gtm://container/tags Full tag listing
container_triggers gtm://container/triggers Full trigger listing
container_variables gtm://container/variables Full variable listing

Prompts (4 total)

Pre-built prompt templates for common workflows:

Prompt Description
inspect_container List all entities with resolved names
audit_container Find unused/orphaned/disabled entities
debug_tag Debug why a specific tag isn't firing
compare_containers Compare two container files

Why JSON Files?

  • Zero auth (no GCP project, no service account)
  • Fully offline and testable
  • Diffable and version-controllable
  • Import back into GTM with one click

Configuration

Environment Variable Description
GTM_CONTAINER_FILE Path to a GTM export JSON file. Auto-loaded on startup.
GTM_READ_ONLY Set to any value to disable all write tools (create, update, delete, move, export). Only read and analysis tools will be available.

Development

npm test        # Run tests
npm run dev     # Run server
npm run build   # TypeScript check

License

MIT

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