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

Annotations already declare readOnlyHint and openWorldHint, and the description adds meaningful behavior: it is the public github.com board, counts will be null because the board shows names and popular repositories rather than follower numbers, and it costs 1 credit. It does not cover pagination or rate limits, but it adds useful caveats beyond annotations.

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?

Three short sentences, front-loaded with the purpose and followed by source, null-count caveat, and credit cost. Every sentence adds useful information with no repetition or wasted text.

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 scraper with no output schema and low schema coverage, the description covers the source, null counts, and cost. However, it omits how since, language, and cache_max_age affect results, leaving important invocation details incomplete.

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?

The description never mentions the since, language, or cache_max_age parameters. Schema description coverage is only 33%, and the description does not compensate for the undocumented parameters, even though the since enum values are largely self-explanatory.

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 that it returns trending developers from the public github.com/trending/developers board, a specific resource and source. The name/title and 'developers' distinguish it from github_trendingRepositories, but it does not explicitly name or contrast sibling tools.

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 no when-to-use, when-not-to-use, or alternative guidance, such as when to choose github_user or github_trendingRepositories instead. It only notes the credit cost, leaving tool selection to inference.

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