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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so safety is covered. The description usefully adds the temporal constraint that data is for the 'latest charted season,' but says nothing about return shape or whether the side defaults, which matters since there is no output schema.

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?

A single front-loaded sentence packs the resource, breakdown dimensions, side, and scope with zero filler. Nothing could be trimmed without losing information.

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 and one undocumented parameter, the description should say more about what the returned EPA breakdown looks like and how side behaves when omitted. It is adequate for a simple stats lookup but leaves the return contract underspecified.

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 only 50%: team is documented with an example (KC/PHI), but the side parameter has an enum with no description. The phrase 'on offense or on defense' does clarify the meaning and valid values of side, adding value over the bare enum, but does not compensate fully for the undocumented parameter.

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 (EPA) broken down by personnel grouping and defensive package, scoped to one team and a season. It is clearly a stats-lookup distinct from the raw invoke_nfl_personnel sibling, though it does not explicitly name that sibling to sharpen the distinction.

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 reach for this tool versus alternatives such as invoke_nfl_personnel or invoke_nfl_dvp. The agent must infer usage from the resource being returned, with no prerequisites or exclusions stated.

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