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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so safety is covered. The description adds real value beyond them by warning that odds are 'deeply nested by market' and that the full structure comes back under `raw` — useful return-shape context, especially since no output schema exists.

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 tightly-scoped sentences front-load the purpose, then the return-structure caveat, then the prerequisite and a concrete invocation example. No sentence is filler and the ordering matches how an agent needs the 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?

With no output schema, the description compensates by explaining the `raw` wrapper holding the nested odds structure, and annotations cover the safety profile. The only minor gap is that it does not indicate whether odds may be missing/empty for some markets, but nothing essential to correct invocation is 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%, so both parameters are already documented in the schema. The description's mention that event_id comes from betsapi_inplay/betsapi_upcoming duplicates the schema's own description, and the example adds no syntax beyond what the schema's example block 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?

States a specific verb and resource: 'Bookmaker odds for a single event across markets', with the covered markets (moneyline, spreads, totals) named. This is clearly distinguishable from sibling listing tools like betsapi_inplay and betsapi_upcoming, which supply event ids rather than odds.

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?

Explicitly gives the prerequisite: 'Get an event_id from betsapi_inplay or betsapi_upcoming first,' naming the sibling tools that produce the required input. It does not describe when this tool is preferable over an alternative odds source, but no competing odds sibling exists, so the routing guidance is effectively complete.

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