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 only that links represent the paid/organic join; it says nothing about behavior when no link exists (empty list vs. error) or pagination of results.

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 purpose is front-loaded in one tight sentence with a useful gloss. The trailing 'Tools revision: d80f65c0.' line adds no meaning for tool selection and is dead weight.

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 output schema covers return values and annotations cover safety, so the description is close to sufficient for a simple read tool. It still leaves the property-identifier format and the empty-result behavior unaddressed, which are the two things an agent would most need.

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, and the description does not compensate: it never states the expected identifier form (e.g., 'properties/123456') or where to obtain it via ga4_list_properties. This is the main practical ambiguity for calling the tool 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?

Uses a specific verb ('List') and resource ('Google Ads links of a GA4 property') and adds a clarifying gloss ('the paid+organic join'). An agent can distinguish it from the sibling write operation ga4_create_google_ads_link, though the description does not name that alternative explicitly.

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?

The listing verb plus read-only framing implies when to reach for it (inspecting existing Google Ads links on a property), but there is no explicit when/when-not guidance and no mention of the related ga4_create_google_ads_link tool for creating links. Usage must be inferred.

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