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rgellis

Google Tag Manager MCP Server

by rgellis

Set Latest Version

set_latest_version

Set the container version that workspaces use as a baseline for conflict detection when syncing, without changing what is published.

Instructions

Set the version that workspaces sync against.

This is the baseline used to detect conflicts when a workspace syncs. It does not change what is published.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
account_idYesNumeric Tag Manager account ID.
version_idYesNumeric container version 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

A4/5.0
Behavior4/5

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

With no annotations provided, the description carries the full burden. It clearly discloses that this is a mutation (set) and adds a key behavioral detail: it does not change published state. However, it does not mention potential consequences for existing workspaces or authorization requirements, leaving some gaps.

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 that front-load the core purpose and then add clarifying context. It contains no extraneous words and is efficiently structured.

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 set operation with an output schema present, the description covers the essential purpose and a key distinction from publishing. It lacks detail on prerequisites or error conditions, but is reasonably complete for the tool's complexity.

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?

Schema coverage is 100%, so all three parameters are already documented in the schema. The description adds no additional parameter-specific meaning beyond what the schema provides, so the baseline score of 3 applies.

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

Purpose5/5

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

The description states a specific verb and resource: setting the version that workspaces sync against. It clearly distinguishes itself from publishing by explicitly noting 'It does not change what is published,' which differentiates it from publish_version and update_version among siblings.

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

Usage Guidelines3/5

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

The description provides context that this is the sync baseline and clarifies it does not affect publishing, but it does not explicitly name alternative tools or conditions for when to use this tool versus others. Usage is implied but left to the agent's inference.

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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