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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint, so the safety profile is covered. The description adds meaningful context: it clarifies that the response does not guarantee the book will accept the betslip, that affiliate 27 is excluded, that empty results don't imply lack of coverage, and that there is no background polling or automatic retry. This goes beyond annotations, though it could specify rate limits or auth requirements more clearly.

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 mostly front-loaded with the core purpose, then adds operational constraints. It is somewhat dense and could be better structured with bullet points for clarity, but it avoids unnecessary fluff and every sentence carries information.

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?

Given the presence of an output schema and rich annotations, the description provides sufficient additional context: it explains non-guarantees, affiliate exclusions, and the absence of polling/retries. However, it does not mention pagination behavior or how to interpret the ranking beyond price, which could be useful for a complex tool with nested parameters.

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%, so the schema already documents all parameters. The description adds the affiliate exclusion and the POST body's read-only nature, but does not elaborate on leg structure or limits beyond what the schema provides. 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 states the tool returns sportsbooks with all requested legs open, ranked by combined same-book price. It distinguishes itself from the sibling v2GetParlayBook by focusing on best same-book price ranking, though it could more explicitly contrast with the wider family of 'best line' and 'parlay' tools.

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 the tool is for finding sportsbooks that offer all legs of a parlay, and mentions it is read-only and does not submit a bet. However, it offers no explicit guidance on when to use this versus v2GetParlayBook or v2GetBestLineMulti, and no exclusions beyond the affiliate exclusion.

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