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

The description frames this as a retrieval ('will provide you with historical data'), yet the annotations declare destructiveHint=true, readOnlyHint=false, and idempotentHint=false. That is a direct conflict between the described behavior and the structured safety profile, and the description offers no reconciliation (no note that it is a billed live POST call, no rate-limit or cost disclosure).

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 that states the endpoint's output, with no filler or redundancy. It is efficient, though the brevity is partly what leaves usage and behavior unaddressed.

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?

Since an output schema exists, return values need not be described, and for a single-parameter tool the purpose statement is nearly sufficient. But the missing usage routing across many near-identical siblings and the unreconciled destructive annotation leave the definition only minimally adequate.

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 reported as 0% for the top-level body parameter, but the nested fields (technology, date_from, date_to, tag) carry their own descriptions in the schema. The prose implies the 'technology' selector and the country/language breakdown but adds no new syntax, defaults, or date-range semantics beyond what the schema already documents.

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 gives a concrete verb+resource+scope: it returns historical counts of domains per country and language using a given technology. An agent can distinguish this 'stats' output from siblings like summary_live or domains_by_technology_live. It does not, however, explicitly contrast itself against those siblings.

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 statement of when to use this endpoint versus the numerous sibling tech endpoints (aggregation_live, summary_live, domains_by_technology_live, for_domain_live). No prerequisites, no exclusion conditions, and no guidance on the live-vs-batch tradeoff despite batch_use existing as a sibling.

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