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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds a genuinely useful behavioral caveat beyond the annotations: 'Prices may have moved since the scan,' warning the agent that results are a stale snapshot rather than live odds.

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 compact sentences with no filler; the core purpose comes first and the freshness caveat follows. The colon-heavy phrasing is slightly dense but not wasteful.

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 need no explanation, and all three parameters are fully documented in the schema. With annotations covering the read-only safety profile and a freshness caveat supplied, the description is nearly complete; relational guidance versus 'arbs' is the only real gap.

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 'game', 'text', and 'books' with usable descriptions. The prose adds nothing about parameter syntax, formats, or defaults, so the 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 states what the tool produces (spread and total middles across sportsbooks) and even defines the domain term inline ('two numbers far enough apart that both bets could win'), so an agent can grasp the concept without outside knowledge. It does not, however, distinguish itself from the closely related sibling 'arbs', which an agent would likely confuse it with.

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?

There is no explicit when-to-use guidance, no mention of prerequisites, and no routing to alternatives such as 'arbs' or 'game_lines'. Usage is only implied by the content of the result.

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