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

Annotations already declare readOnlyHint=true and openWorldHint=false, but the description adds substantive context beyond them: results are aggregates only ('counts and distributions only, with their method') and 'current' figures are provisional week-to-date, a data-freshness caveat the annotations do not convey. It stops short of describing pagination or output volume.

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?

Purpose and scope are front-loaded in the first sentence, with parameter-mode guidance following. It is dense and largely waste-free, though the middle clause ('Counts and distributions only, with their method') is slightly clipped in phrasing.

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 single optional parameter with no output schema, the description adequately covers what the report contains and how to select the latest versus provisional version. It could say a bit more about scope boundaries versus the stats/history siblings, but nothing essential for a correct call is missing.

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 100%, so the baseline is 3, but the description adds meaning the schema cannot express: the absent-id default (latest published report) and the distinction between a final dated report and the provisional 'current' mode. That is real added value over the pattern documented in the 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?

States a specific verb+resource ('weekly State of Agent Services report') and enumerates the covered domains (coverage, probe results, payment networks, prices, purpose tags), which implicitly separates it from siblings like get_stats or get_changes. It never names a sibling explicitly, so it falls short of the 5 bar for full differentiation.

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 gives mode-selection guidance for the id parameter (omit for latest published, 'current' for provisional week-to-date), which is genuinely useful. However, it never states when to prefer this tool over alternatives such as get_stats or get_history, so selection versus siblings is left to inference.

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