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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered; the description adds real value by specifying the exact shape of the response (roster roles, player ids, match scores/results, news). It does not mention staleness/freshness of recent matches or whether roster data may be missing, which would be the remaining behavioral 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?

Two dense sentences: the first front-loads what comes back, the second front-loads id acquisition and next steps. No filler, no restatement of the tool name.

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 an output schema present, the description need not document return shape, yet it still summarizes the payload well enough to support tool selection. Combined with the id-provenance sentence, an agent has everything needed to call it correctly on the first attempt.

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 single parameter is fully documented, so 3 is the baseline. The description adds provenance the schema lacks (vlr_event as an additional id source beyond the schema's "vlr_rankings or a match page") and reinforces that the id is numeric, which meaningfully helps an agent avoid passing a slug.

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 and resource ("Returns one VLR.gg Valorant team by numeric id") and then enumerates the payload: identity fields, roster with role breakdown, recent matches with results, and related news. An agent can immediately distinguish it from list/search siblings like vlr_rankings or vlr_team_matches.

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?

Explicitly tells the agent where to source the id ("Get team ids from vlr_rankings, vlr_event or vlr_match") and routes the follow-up action ("use vlr_player with a roster id"). It stops short of stating when *not* to use it (e.g., for team match history use vlr_team_matches instead), so it is clear context without full exclusions.

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