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

Annotations already fully declare readOnlyHint, idempotentHint, and non-destructive behavior, so the description needs to add context it does not supply — no pagination behavior, no note on return shape, and the only extra sentence is a 'Tools revision' marker that carries no behavioral information.

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 tight and front-loaded, but the second sentence ('Tools revision: 5c9bea8f.') is build metadata that adds no value for an agent and should not be in a tool description.

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?

For a simple read-only listing tool with a full annotation set and an output schema, the description covers the essentials; the main missing piece is what form the 'property' argument takes, which the agent needs 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?

The single required parameter 'property' has 0% schema description coverage, and the description does nothing to clarify the expected format (numeric ID vs. 'properties/123' resource name). With low coverage the description should compensate but does not.

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?

Clear verb + resource ("List the custom dimensions of a GA4 property") that is unambiguously distinct from siblings like ga4_list_custom_metrics and ga4_create_custom_dimension. It does not explicitly contrast with those siblings, but the name and phrasing make the scope obvious.

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 guidance on when to use this versus the related tools (create/update custom dimension, list custom metrics), and no prerequisites or exclusions stated beyond the implied 'I need to see existing dimensions' context.

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