get_fixtures

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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior, so the safety profile is covered. The description adds a default-to-today behavior and notes that live scores, corners, and cards are included, but does not go deeper into pagination or response behavior. This is adequate but not exceptional.

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 short sentences with no filler. The primary purpose and key default are front-loaded, and the output-information detail is relevant and compact.

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 all parameters covered by the schema, annotations covering read-only/idempotent behavior, and a description that names the output highlights, the tool is largely complete for invocation. The only notable gap is the lack of explicit routing against league/team-specific sibling tools.

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 fully documents all five parameters. The description only re-emphasizes the date scope and default, which does not meaningfully add beyond the schema. 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 a specific verb ('List'), a clear resource ('football fixtures'), and a precise scope ('for a calendar day (UTC)'). It also distinguishes itself from sibling tools like get_league_fixtures and get_team_fixtures by emphasizing the date-based listing scope.

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 usage for date-based fixture lookups and mentions the UTC/day default, but it does not explicitly say when to prefer this over get_league_fixtures, get_team_fixtures, or get_fixture. No alternatives or exclusions are named.

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