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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so safety is covered. The description adds real behavioral context beyond that: results are restricted to already-played matches, the chance shown is the value logged the night before, and the response includes the match result and whether the team covered the line — valuable given there is no output schema.

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?

Front-loaded with the core purpose and organized as purpose → return shape → usage → boundary. It is slightly wordy and colloquial ("the Desk," "won the line"), and the already-played constraint is stated twice, but no sentence is filler.

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 does the necessary work of describing the return fields (logged chance, line outcome, match result) and the temporal boundary. The only gap is that "latest matches" leaves the count or recency window unspecified.

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%, so both parameters are already documented. The description restates the team default ("pass the team, or nothing for the member's own team") consistently with the schema but adds no new syntax or semantics, and the `asked` parameter is not addressed at all. Baseline 3 applies.

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: it returns a team's past matches that the Desk forecast, along with the logged pre-match chance and the outcome. The closing sentence separates it from the upcoming-match path ("never a chance for a match still to come, which comes with the Desk Pass"), though it names a product concept rather than the sibling tool get_desk_pass or query_team_forecast.

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?

Gives explicit invocation contexts: "how the Desk's forecasts did for a team, or what the Desk gave a team in a past match." It also states an exclusion (upcoming matches are out of scope) and a default behavior (pass nothing for the member's own team). It stops short of explicitly pointing at the sibling to use for future forecasts.

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