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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint, so safety is covered. With no output schema, the description usefully discloses the returned fields (team, opponent, venue, handedness, first pitch time) and that times are in Central, adding real value beyond structured data.

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 that names the resource and enumerates the payload fields 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?

For a zero-required-parameter read tool with no output schema and fully documented parameters, the description covers scope and returned fields adequately; only finer points, such as how confirmed vs probable status is represented, are missing.

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%, so team, limit and player are already documented in the input schema. The description adds no parameter-level meaning (e.g., how team and player filters interact), so the baseline of 3 applies.

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 clear resource and scope: today's confirmed and probable MLB starting pitchers by game. An agent can tell this returns today's pitching probables rather than historical splits or health data. It does not explicitly name sibling tools like invoke_mlb_pitcher_health to sharpen differentiation.

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?

The phrase 'Today's confirmed and probable' implies the usage window, but there is no explicit when-to-use, when-not-to-use, or named alternative such as invoke_mlb_pitcher_splits or invoke_mlb_pitcher_health. Usage is inferable rather than stated.

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