openf1_drivers

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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, so the bar is lower. The description adds useful context: 'Auth: none needed' and that the return is a top-level array. It also implies behavior for 'latest' values. No contradiction with annotations.

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 concise: one sentence for purpose, one for return format, and one for auth. It is front-loaded with the primary action and includes all necessary detail without any filler. Every line earns its place.

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 5-parameter, optional-filter list tool with no output schema, the description compensates by explicitly listing the return fields and their structure. It covers session scoping, the latest option, and auth context. Combined with strong annotations, the overall context is 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?

Schema coverage is 100% with detailed descriptions for all 5 parameters, so the baseline is 3. The description only reiterates session_key usage ('Pass session_key or latest') and adds no extra semantics for team_name, name_acronym, driver_number, or meeting_key beyond what the schema already provides.

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 clearly states the resource ('Drivers entered in a session'), the key scope ('Pass session_key or latest'), and the fields returned. It distinguishes itself from sibling tools like openf1_championship_drivers by emphasizing session-level data. This is a specific verb+resource+scope definition.

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 gives clear context: use it to get drivers entered in a session, and explicitly recommends passing session_key (or 'latest') to bound the response. However, it does not explicitly state when not to use it or mention alternatives like championship_drivers or jolpicaf1_drivers, so it falls short of a full when/when-not justification.

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