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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds one useful nuance — that results are 'headers' (summary-level), not full version payloads — but says nothing about pagination, ordering, or how many versions come back. With annotations carrying the behavioral load, a 3 fits.

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

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

The first sentence is front-loaded and wastes no words. The trailing 'Tools revision: d80f65c0.' is build metadata rather than task-relevant information and dilutes an otherwise tight definition.

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

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

An output schema exists, so return-value explanation is not required, and annotations cover the safety profile. What is missing is any detail on the 'container' argument's format and on result ordering or volume — enough gaps that an agent may need a trial call to call it correctly.

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

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

Only one parameter ('container') exists, and the schema gives it zero description coverage. The description does not explain the expected identifier form (numeric container ID vs. path vs. name), so it fails to compensate for the coverage gap. However, a single obvious parameter keeps this from being a serious deficiency.

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

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

States a specific verb ('List') and a specific resource ('the container's published/version history headers'), which is enough to distinguish it from siblings like gtm_list_containers or gtm_list_workspaces. It does not explicitly name those siblings, so it stops short of a 5.

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

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

There is no when-to-use guidance, no prerequisites, and no named alternative. The agent must infer that this is the tool for auditing container version history versus listing containers or workspaces, which is left entirely implicit.

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