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 by structured data. The description adds useful behavioral context about the returned flags (absence already baked into teammates' season averages, injured players the projection still uses), but says nothing about ordering, limit interaction, or what 'new_only' actually filters.

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 that are compact but poorly front-loaded: the purpose is never stated up front, and the second sentence ('Also flags an injured player the projection still gives work') restates the flag concept from the first sentence rather than adding new 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?

For a 4-parameter tool with no output schema and low schema coverage, the description should define the parameters and clarify the output contract. It gestures at return contents but leaves three parameters and the limit/plan-limit behavior unexplained, so an agent cannot call it confidently.

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 25% – only 'limit' is documented – and the description mentions none of 'team', 'new_only', or 'position'. With a boolean 'new_only' that is unexplained anywhere, the description fails to compensate for the coverage gap.

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 implies a board of NFL skill players who are out/doubtful/IR plus the vacated workload, but it never states a clear verb+resource and opens mid-thought with 'Each skill player listed out...'. It does not distinguish this tool from the sibling invoke_nfl_injuries, so an agent cannot tell the two apart from the text alone.

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 when-to-use, when-not-to-use, or alternative guidance. Given that invoke_nfl_injuries, invoke_nfl_start_sit, and invoke_nfl_projections all touch the same domain, the absence of any routing rule is a real gap.

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