Run several GA4 reports

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

Annotations already cover the safety profile (readOnlyHint=true, openWorldHint=true), and the description usefully adds the hard cap of 5 requests plus the cost/latency benefit. However, it says nothing about batch failure semantics — whether one malformed request aborts the whole call or returns partial results — which is the key behavioral unknown for a batch 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?

Two sentences with zero filler; the batching limit and the cost/latency benefit are front-loaded before the field-reference note. Nothing would be gained by lengthening it.

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?

For a read-only batch tool with no output schema, the description covers invocation well but leaves the return shape ambiguous: it doesn't say whether results come back as an ordered array of per-request reports or a merged payload, nor how partial failures surface. An agent can call it, but cannot reliably interpret or error-handle the response.

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?

Top-level schema coverage is 50% (property documented, requests not), but the description compensates by stating 'Each request takes the same fields as run_report,' routing the agent to a known contract instead of guessing. The nested schema is also richly documented per field, so no additional description of metrics/dimensions/filters is needed.

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?

States a specific verb and resource ('Run up to 5 reports for one property in a single API call') and explicitly positions itself against the sibling run_report. An agent can distinguish batch vs single-report behavior immediately.

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?

Gives a clear selection rationale — 'cheaper and faster than separate run_report calls' — which tells the agent to prefer this when multiple reports target the same property. It does not state the inverse case (when run_report is still preferable, e.g. more than 5 reports or reports against different properties).

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