betr_fav4

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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint. The description adds useful context: 'Auth: none needed' and the exact return structure. It does not contradict annotations and provides extra behavioral details (return fields) that annotations do not cover.

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?

The description is extremely concise, with a clear one-line purpose followed by the return shape and auth requirement. Every sentence provides distinct information, and there is no redundancy or fluff.

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?

This is a simple read-only list tool with one optional parameter. The schema fully describes the parameter, and the description provides the return structure in lieu of an output schema. It also covers auth, making the tool's behavior sufficiently complete.

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?

The schema already fully documents the single parameter EventTypeFilter with description 'Race-type filter (7 = all racing)' (100% coverage). The description's phrase 'for a race-type filter' adds no new meaning beyond the schema, so baseline 3 is appropriate.

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 ('Returns') and resource ('Featured 'Fav 4' upcoming races') with a scoping parameter ('for a race-type filter'). It clearly distinguishes from sibling tools like betr_next5_races and betr_todays_races by focusing on the 'Fav 4' subset.

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 description implies usage for retrieving featured Fav 4 races by race type, but does not explicitly state when to use this tool versus alternatives such as betr_next5_races or betr_todays_races. There are no when-not-to-use instructions or alternative tool names.

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