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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and non-destructive intent, so the description does not need to restate safety. It adds useful context beyond the annotations: the free-plan/no-card requirement and the get_player follow-up, and nothing contradicts the 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 with no filler: purpose, output fields, follow-up workflow, and access constraint are each given in one line. The key action and result are front-loaded.

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 full schema documentation, safe-read annotations, and an output schema, the description is mostly complete. It could slightly improve by noting whether it searches only current players vs archive players, given the sibling search_archive_players, but the core workflow is fully covered.

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% and the query parameter is well described with an example ('alcaraz'), while limit has min/max and default. The description only restates 'by name' and adds no parameter semantics beyond the schema, so it lands at the baseline.

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 states the action explicitly: 'Search tennis players by name' and lists the returned fields (id, country, ranking, tour), so an agent knows what the tool does. It is clear, but it does not explicitly distinguish this from search_archive_players, so it misses sibling 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?

It gives concrete workflow guidance: use the returned id with get_player, and it notes the tool works on the free plan, which sets expectations about access. It does not explicitly state when not to use it or name alternatives like search_archive_players, so it falls short of fully explicit routing.

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