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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the description need not restate safety. It adds nothing beyond that: no note on scope (built-in vs custom), freshness, or result size. The only extra line is a build revision string, which is not behavioral context.

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 core sentence is efficient and front-loaded, but the second line about the tools revision is operational noise that does not help an agent select or invoke the tool.

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?

The presence of an output schema means return values need not be described. However, for a tool whose only input is an undocumented property identifier, the description should carry the identifier format, and it does not.

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?

Schema description coverage is 0% for the single required 'property' parameter. The description does not clarify the expected identifier form (e.g., 'properties/123456789'), so the agent gets no help on a parameter that must be supplied correctly.

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?

Specific verb and resource: lists the dimensions and metrics available for a GA4 property. It is distinguishable from ga4_list_custom_dimensions and ga4_list_custom_metrics, though it never says explicitly that it covers the built-in/all available set versus custom-only, which would have sharpened the sibling distinction.

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?

No when-to-use guidance or named alternatives. The metadata-lookup-before-reporting use case is only implied by the word 'available'. An agent must infer that this is for discovering valid dimension/metric names.

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