Ga4.Report

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

No annotations are provided, so the description carries the full burden. It implies a read-only report but never states that no state is modified, nor does it disclose GA4 Data API quota/rate-limit behavior, required property-level permissions, row limits, or handling of sampling/thresholding — all material for a reporting call.

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?

A single front-loaded sentence with zero filler, but it is under-specified rather than concise: for a five-required-parameter reporting tool with no annotations, the title-level brevity leaves vital invocation detail unstated.

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, but that is the only thing covered elsewhere. With no annotations, 0% parameter coverage, and GA4's idiosyncratic dimension/metric naming, the description is too thin for an agent to call this correctly without trial and error.

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 coverage is 0% and the description only gestures at 'date range', which covers 2 of 5 required parameters. Nothing explains property_id format (e.g., 'properties/123456789'), accepted dimension/metric names, array cardinality, or date syntax ('YYYY-MM-DD' vs '30daysAgo'), so the agent gets almost no help beyond the bare schema.

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 names a specific verb (runReport / report) and resource (GA4 Data API) plus a scoping constraint (over a date range), which is far better than a tautology. It does not, however, explicitly contrast with the closest sibling ga4.realtime (real-time vs. historical) or with ads.report.* / searchconsole.search_analytics, so differentiation relies on the tool name alone.

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 explicit when-to-use or when-not-to-use guidance. The phrase 'over a date range' faintly implies historical (non-realtime) reporting, but the agent is left to infer that ga4.realtime is the alternative for live data and that this is the tool for standard aggregated reporting.

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