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 fully covered by structured data. The description adds nothing beyond a restatement of the title plus an irrelevant 'Tools revision' line — no note on result caps, ordering, or empty-list behavior.

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 short and front-loaded, which is good, but the trailing 'Tools revision: d80f65c0.' sentence adds no decision-relevant information for an agent and is pure noise.

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 values need not be explained, and annotations cover the safety profile. However, for a tool whose only parameter is entirely undocumented, the description leaves an agent guessing at the identifier format and result limits, which is a real gap despite the tool's simplicity.

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, so the description must carry the load. It only implies that a GA4 property is involved and never states the expected identifier format (e.g. 'properties/123456789') or whether a bare numeric ID is accepted.

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?

The description states a specific verb and resource ('List the custom dimensions') scoped to 'a GA4 property', which lets an agent distinguish it from ga4_list_custom_metrics and ga4_create_custom_dimension. It stops short of explicitly naming the read-vs-create alternative, so it is clear but not maximally differentiated.

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 guidance on when to call this versus ga4_get_metadata (which may also expose dimension info) or the list/create/update siblings, and no stated prerequisites such as the required property resource-name format or pagination behavior for long dimension lists.

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