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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is fully covered by structured data. The description adds only that results are aggregated over the archive, with no note on caching, rate limits, or how empty date ranges behave.

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 wastes no words and puts the scope ('across the archive for a date range') before the enumerated outputs.

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 described, and the description is adequate for a read-only aggregate. However, with three undocumented parameters and zero usage routing, an agent gets little help on how to call it correctly versus its many 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% and there are three parameters. The phrase 'date range' loosely maps to from_date/to_date, but neither the accepted date format nor the semantics/default behavior of min_count is explained anywhere, so the description fails to compensate for the schema gap.

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 (get), resource (JavaScript library detection statistics) and even enumerates the headline outputs: total fingerprints, detection rate, most common libraries. It is distinguishable from siblings like get_js_library_inventory or get_jsfingerprint_hash_prevalence, though it never names an alternative to sharpen the boundary.

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 only contextual cue is 'for a date range'; there is no statement of when this aggregate stats tool should be chosen over the many other JS-fingerprint siblings (bundle stats, hash prevalence, library inventory) and no prerequisites or exclusions.

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