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 safety behavior is covered. The description adds only the property ID format (properties/<id>) and general report scope; it omits limits, pagination, date formats, and error 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 first sentence is concise and front-loaded with the core purpose. The appended 'Tools revision' sentence adds no value for tool selection or invocation and should be removed.

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 exists, so return values need not be explained, but the description is still incomplete for a six-parameter report tool with 0% schema coverage. It lacks crucial parameter semantics and does not differentiate this report from its many GA4 report siblings.

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 explain all six parameters. It clarifies the property format and the general dimensions/metrics/date-range concept, but it does not explain date formats, the optional dimensions default, the metrics array, or the limit parameter.

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: running a GA4 Data API report over dimensions and metrics for a property and date range. It does not distinguish this general report tool from sibling report types such as ga4_run_cohort_report, ga4_run_funnel_report, ga4_run_pivot_report, or ga4_run_realtime_report.

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?

It gives no explicit guidance on when to use this tool versus the other GA4 report tools. The dimensions-by-metrics framing implies general reporting, but it lacks exclusions, prerequisites, or alternative-routing advice.

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