ga4_user_behavior

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

No annotations are provided, so the description carries full burden. It discloses that the tool executes a single batch request and returns three reports, implying a read-only operation. It does not mention side effects, rate limits, or authentication, but the behavior is reasonably transparent for a reporting tool.

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 concise with two paragraphs and four sentences. The first sentence front-loads the core purpose, followed by a technical detail, a usage hint, and a filter clarification. No filler or repetition.

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 tool has an output schema, the description's lack of return structure detail is acceptable. It sets expectations by naming the three reports. However, the missing parameter documentation for property_id creates a gap, preventing a perfect score.

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%, so the description must compensate. It only explains hostname and country as filters, leaving start_date, end_date, and property_id unexplained. The property_id is especially important as it is nullable with a default null, and the description does not clarify how it is resolved.

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 fetches GA4 sessions and engagement rate broken down by device, country, and user type. It specifies it executes a single batch request returning three reports, which distinguishes it from sibling tools like ga4_conversion_funnel or ga4_page_performance that focus on other metrics.

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 provides useful context by stating it is 'useful for audience analysis' and explains that hostname and country parameters narrow results across all sub-reports. This helps an agent decide when to use it, though it does not explicitly exclude other use cases or name alternatives.

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