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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered structurally. The description adds genuine behavioral context beyond that: the upstream source (nflverse), the historical window (2009–current), and the result ordering ('latest week first'). It omits any note on rate limits, auth, or result volume, keeping it short of a 5.

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 sentences, both dense: the first front-loads the resource, source, coverage, and returned fields; the second delivers the filtering and ordering rules. No filler or restatement of the 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 no output schema, the description carries the return-value burden and does so by enumerating the key returned fields plus ordering. It is nearly complete for a read-only data tool, with only pagination/result-size behavior (beyond the schema's limit field) left unaddressed.

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 (team, week, limit, player, season) is already documented with its own format hints, including team abbreviations. The description's mention of team/week/player filtering adds no syntax or constraint detail beyond the schema, so the baseline 3 is correct.

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 names a specific resource (official NFL weekly injury reports), its source (nflverse), its coverage window (2009–current), and the exact fields returned (player, team, position, game status, practice participation). This is plainly distinguishable from siblings such as nfl_play_by_play, nfl_schedule, and nfl_player_season_stats without opening any schema.

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 states how to narrow results ('Filter by team, week or player name') and that results are ordered 'latest week first', which implies the retrieval context. However, it never says when to prefer this tool over the other nfl_* siblings, nor any when-not condition, so usage is only implied.

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