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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds real semantic context beyond that: that `tools` treats a day as counting if any listed tool was used, and that `verified` means GitHub's public calendars back the shipped days – non-obvious behavior an agent cannot infer from the schema.

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 dense sentences, front-loaded with the resource and ranking dimensions before the optional filters. Nearly every clause maps to a parameter or documented behavior; there is minimal filler.

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?

With no output schema, the description does establish what the ranking is over and how rows are filtered, and all 9 parameters are documented in the schema. The remaining gap is the shape of a returned row (fields besides rank), which is left implicit.

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 100%, so every parameter is already documented at the field level, including defaults and the from/needs-to constraint. The description only restates parameter categories (date range, tools, verified) without adding syntax or interaction detail, so the baseline 3 applies.

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 resource (a leaderboard of AI-assisted developers) and enumerates the ranking dimensions (consistency, shipped, streak, tokens), so an agent knows exactly what is returned. It does not explicitly contrast itself with siblings like get_profile or get_today, but the resource is distinct enough in practice.

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 implies usage through its optional filters (date range, tools, verified) but never says when to pick this over get_my_profile or get_today, nor states any prerequisites. Adequate implication, no explicit routing guidance.

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