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Google Tag Manager MCP Server

by rgellis

Get Tag

get_tag

Retrieve a single tag from a Google Tag Manager workspace by providing account, container, workspace, and tag IDs. Get the tag's configuration for review or updates.

Instructions

Get one tag from a workspace.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tag_idYesNumeric tag ID.
account_idYesNumeric Tag Manager account ID.
container_idYesNumeric container ID.
workspace_idYesNumeric workspace ID.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.9/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only says 'Get one tag,' which implies a read operation but does not explicitly state that it is non-mutating, what happens if the tag is not found, or whether permissions are required. The description adds minimal behavioral context beyond the tool's name.

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

Conciseness4/5

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

The description is a single concise sentence with no redundant wording. It is front-loaded with the core action and resource. It could be slightly more informative without losing conciseness, but as written it is efficient.

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

Completeness3/5

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

The tool is a straightforward getter with a complete input schema and an output schema, so the description does not need to explain return values. However, the description lacks any guidance about when to use this tool, how to locate tag_id, or the relationship to workspace/container/account IDs. It is minimally adequate but has clear gaps.

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 has 100% description coverage, so all four parameters are already documented as numeric IDs. The description adds no extra meaning about the parameters, but the schema compensates fully. This matches the baseline of 3 for high schema coverage.

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 states a specific verb and resource: 'Get one tag from a workspace.' This clearly distinguishes it from list-oriented or mutation tools like list_tags, create_tag, and update_tag. However, it does not explicitly contrast it with siblings like get_workspace or get_trigger, and the phrase is close to the tool name, so it lacks full differentiation.

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

Usage Guidelines2/5

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

The description gives no guidance on when to use this tool versus alternatives such as list_tags or get_workspace. There is no mention of prerequisites, fallback behavior, or exclusions. The usage context is only weakly implied by the verb 'get,' so an agent receives little decision support.

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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