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Google Tag Manager MCP Server

by rgellis

Summarize Container

summarize_container

Get a quick overview of a GTM container's settings, workspaces, and live state.

Instructions

Summarise a container: settings, workspaces and what is live.

The quickest answer to "what is this container and what is it running".

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
account_idYesNumeric Tag Manager account ID.
container_idYesNumeric container ID.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A3.8/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the behavioral disclosure burden. It clearly indicates this is a summary/read-like operation covering settings, workspaces, and live state, which is useful, but it does not explicitly state that it performs no modifications or describe any other behavioral traits.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is two short sentences with no filler. The main definition is front-loaded, and the second sentence adds a practical use case, so every word earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple two-parameter tool with an output schema and a clear summary intent, the description is largely sufficient. It could be more complete by explicitly noting that this is a read-only aggregation and distinguishing it from get_container or lookup_container, but nothing essential is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema already fully documents both parameters (account_id and container_id) with descriptions, so the schema coverage is 100%. The description adds no additional parameter-level meaning beyond referring to the container.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('Summarise') with a clear resource ('container') and lists the output scope: settings, workspaces, and what is live. It is distinguishable from detailed sibling tools like get_container, but it does not explicitly name or contrast with any sibling.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The phrase 'The quickest answer to...' gives a clear usage context: use this when you need a fast high-level overview rather than deep detail. However, it does not state when not to use it or name alternative tools for fuller details.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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