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

Annotations already declare readOnlyHint and openWorldHint, so the description is not carrying the safety burden, and it uses the freed space well: it discloses the default tour (R), that result shape varies by tour ('group counts differ by tour'), that stat IDs stay strings like 02675, and that filtering is deliberately absent. That last point importantly prevents a caller from trying to construct filters. It stops short of describing pagination or response size, which matters for an open-world tool that returns 'every category'.

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 dense sentences, front-loaded with what is returned before the parameter detail, and no filler. It is slightly over-packed in the second sentence, where the tour code list is duplicated verbatim from the schema, which is wasted effort rather than harm.

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 single optional parameter with full schema coverage, an output schema, and read-only annotations, this covers what an agent needs: default behavior, tour variation, preserved string IDs, and the explicit absence of filtering. The only residual gap is an indication of response size or pagination when 'every category' is returned.

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% and the enum-to-code mapping is already in the schema, so the baseline is 3. The description earns above that by adding two things the schema cannot: the operational consequence that 'group counts differ by tour' (so callers should not assume a fixed shape) and the rationale that omitting the tour yields the website default R.

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 pairs a specific verb with a specific resource: 'Get the golf statistics overview for one PGA Tour context', and enumerates what comes back (year, categories, subcategories, stat entries, featured stat lists). It is clearly distinguishable from pgatour_leaderboard or pgatour_schedule by scope, though it never names a sibling to draw the contrast 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?

Usage is implied rather than stated: call this for a tour-wide statistics overview, and 'no year, category or round filter is exposed because those are separate source surfaces' hints that finer-grained queries belong elsewhere. There is no explicit when-to-use statement, no prerequisites, and no named alternative tool to route to.

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