fixtures

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

With no annotations and no output schema, the description carries the full disclosure burden, and it only contributes the at-least-one-filter rule. It says nothing about whether past, live, or upcoming fixtures are returned, how results are ordered or paginated, or how `last`/`next` behave — all material for a 10-parameter read tool.

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?

Single line, front-loaded, with no wasted words. The brevity is under-specification rather than true conciseness, but nothing is padded or buried.

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?

A 10-parameter tool with no annotations, no output schema, and 40% schema coverage needs considerably more description than one sentence. Key behaviors (date range semantics, ordinal `last`/`next`, timezone handling, result shape) are absent from every structured field.

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 40%, and the description only echoes four parameter names that the schema already documents (date format, team id, league id, season year). It adds no meaning for `from`, `to`, `last`, `next`, `status`, or `timezone`, leaving the most ambiguous parameters unexplained in both places.

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 names the resource ('Fixtures') and the four filter dimensions it accepts (date, league, team, season), so the agent can infer it returns scheduled matches. However, it never supplies an explicit verb and never distinguishes the tool from siblings like live_scores or events, which also return match-level data.

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 parenthetical '(at least one filter)' is a real usage constraint that tells the agent it cannot call this with no arguments, despite the schema marking zero required parameters. Beyond that precondition there is no guidance on when to pick this over live_scores, events, or standings, and no exclusions.

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