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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered; the description's real contribution is the payment model — $0.002 USDC per successful call via x402 on Base/Solana/Arc, with failed calls free. That is meaningful cost/behavior context an agent needs before invoking. It omits any rate-limit or freshness/latency notes, keeping it short of a 5.

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 sentences, front-loaded with the resource and its column shape, then the pricing clause. Dense but every part carries information; the long column enumeration is slightly list-heavy yet genuinely useful for deciding relevance.

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?

An output schema exists, so return values needn't be explained, and the description nonetheless conveys the table shape plus the payment model for an openWorld, paid endpoint. It is complete enough to invoke correctly, with only routing guidance among siblings absent.

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% with only 3 optional params, so the schema already documents stat, limit, and sport fully. The description adds only a passing example of a stat slug (points-per-game) and the sport scope, which is baseline-level reinforcement rather than new 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 resource (TeamRankings team stat table), the sports covered (NBA/NFL), and the granularity (one stat page such as points-per-game), even enumerating the returned columns. That is far more specific than the sibling names alone, though it never explicitly contrasts itself with near-neighbors like dev_nba_stats or dev_espn_standings.

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 by the 'one stat page' framing and the column list, which tells an agent this is a per-stat leaderboard lookup. There is no explicit statement of when to prefer it over the many sports-stat siblings, nor any exclusion or prerequisite beyond pricing.

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