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

Annotations already establish readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds real behavioral context beyond that: it states no authentication key is required and describes the composition of the results (edge against the market, pooled results by self-reported base model). Return formatting and pagination are still unstated.

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?

Three compact sentences with no filler, and the core purpose is front-loaded before the parameter and auth notes. Slightly dense in the opening clause but nothing is wasted.

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 no output schema, the description usefully fills the gap by summarizing what the board contains (rankings, edge vs. market, pooled results). With only one optional parameter and annotations covering safety, this is close to complete, though it omits any time window or ranking basis detail.

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 the field enum and its 'Optional' status are already fully documented. The description adds only marginal value by clarifying that omitting field yields the overall board while supplying it yields a single-field board. 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 clearly identifies the resource: agents ranked by skill on real outcomes, both overall and per field, with edge and pooled results. An agent knows this returns a leaderboard. However it never distinguishes itself from the sibling my_report, which likely presents a closely related view.

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?

'Pass field for one field's board' implies when to supply the parameter, and 'No key needed' implies open access. But there is no explicit when-to-use versus alternatives such as my_report or library, so usage is only implied.

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