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 the 'verified season' constraint, which hints that only recognized seasons are accepted, but says nothing about auth, rate limits, or response shape.

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 tight sentence with the resource and scoping front-loaded; nothing is wasted. It is short enough that it could afford one more clarifying clause without bloat.

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 simple two-parameter lookup with a full-coverage schema and an output schema, the description covers the essentials an agent needs. It lacks only routing guidance to sibling arm-strength tools.

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 the schema already documents player_id and the year enum (2020-2026 or 9999). The description restates player id and 'all years' but adds no format or validation detail beyond the schema, matching the baseline for full coverage.

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 specific verb (Fetch) and resource (Arm Strength throw records) scoped to an individual player, which separates it from the aggregate-style mlb_statcast_arm_strength sibling. It does not name that sibling explicitly, so differentiation relies on the word 'individual'.

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 implies the usage context (needs a player id and a verified season) but gives no explicit when-to-use versus alternatives such as the non-player arm strength endpoint. No exclusions or prerequisites beyond the implicit inputs.

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