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

No annotations are provided, so the description carries the full disclosure burden. It hints at streaming with '(streamed)' but never explains the NDJSON output format, chunking behavior, ordering, or whether results are paginated or unbounded. For a read-only search this is a significant but not catastrophic gap.

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?

It is extremely short and front-loaded, but the brevity is under-specification rather than efficiency — the one distinguishing word, '(streamed)', is unexplained. There is no wasted text, but there is also almost no 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?

With two required parameters, no annotations, and no output schema, the description should compensate by explaining the streaming format and its tradeoffs against players_search. It does neither, leaving the agent unable to confidently select or correctly consume this tool.

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% — both 'q' (search prefix) and 'region' (enum of eu/na/asia) are documented in the schema. The description adds no parameter meaning beyond what is already structured, so the baseline of 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?

The description states a verb and resource ('Search players'), which is minimally clear, but the parenthetical '(streamed)' is cryptic and never explained. It does not distinguish this tool from the sibling players_search, leaving the key question — why NDJSON streaming exists as a separate tool — unanswered.

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 guidance on when to use this streamed variant versus players_search, players_search_ndjson's obvious alternative. No prerequisites, no context about result volumes or streaming consumers are mentioned, so the agent must guess from the name suffix alone.

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