ga4_compare_all_sites

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

No annotations are provided, so the description must carry the full burden. It describes the tool as a read operation ('get metrics') but does not disclose any behavioral traits such as authentication requirements, data freshness, error handling for missing sites, or whether the operation is expensive. The description is insufficiently transparent about side effects or constraints.

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 description is a single sentence summarizing the purpose, followed by an inline list of the three sites. It is concise and front-loaded with the key action. No unnecessary words.

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?

Given the lack of output schema and annotations, the description is minimally complete. It explains what it does and the specific sites, but omits details about the type of metrics returned (e.g., users, sessions) and any prerequisites (e.g., all sites must have data). For a tool with two optional parameters, this is adequate but not comprehensive.

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 input schema has 100% coverage with descriptions for both parameters. The tool description does not add any additional semantic information beyond what the schema already provides, such as formatting or default behavior. Therefore, it does not improve parameter understanding.

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 clearly states the tool's function: retrieving audience overview metrics for all three specific sites simultaneously for side-by-side comparison. It distinguishes itself from single-site tools like ga4_audience_overview by emphasizing 'ALL three configured sites at once.'

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 description implies usage when a quick comparison across the three listed sites is needed. However, it does not explicitly state when not to use this tool or mention alternative tools (e.g., ga4_audience_overview for individual sites). The context is clear but lacks direct guidance.

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