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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the situational split (bases-empty vs runners-on) as behavioral context about what the rows contain, but since an output schema exists it does not need to enumerate return values, and it says nothing about auth, rate limits, or row volume.

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 tightly written sentences with the payload description front-loaded and the required-parameter sourcing note second. No filler and no repetition of schema details.

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 a full output schema and readOnly/openWorld annotations, the description needs only to establish purpose and parameter sourcing, which it does. It is essentially complete, with the only gap being explicit differentiation from the adjacent pitch tempo/timer 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 all five parameters (type, entity_id, game_type, season_start, season_end) are already documented in the schema; baseline is 3. The description adds only the sourcing hint for entity_id ('from the leaderboard') and nothing new about type, game_type, or season semantics.

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 specific verb (Return) and resource (a player's Pitch Tempo detail rows) and enumerates the content: elapsed seconds, pitch counts, and hot/cold frequencies split by bases-empty vs runners-on. It distinguishes itself from the sibling mlb_statcast_pitch_tempo by pointing at 'the leaderboard' as the source of entity_id, though it does not name the sibling explicitly.

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 line 'Use an entity_id from the leaderboard' tells the agent how to obtain the required parameter, which is useful prerequisite guidance. However, it gives no explicit when-to-use/when-not guidance versus the pitch tempo leaderboard or the related mlb_statcast_pitch_timer sibling, leaving selection largely implied.

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