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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the timezone default (UTC) and the YYYYMMDD format, but does not clarify what 'grouped' data contains or how results are organized. Adequate but not rich beyond the annotations.

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 tight sentences with no filler; the primary purpose and format are front-loaded and the routing cue comes second. Every clause earns its place.

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 an output schema present and annotations covering the safety profile, the description need not explain return values or permissions. It supplies the essentials (date format, timezone default, alternatives) for a simple two-parameter read tool, leaving only the meaning of 'grouped' data 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 description coverage is 100%, so both parameters are fully documented in the schema. The description only restates the date format and timezone default, adding essentially no syntax or semantics beyond what the schema already provides. 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 (Fetch) and resource (grouped match data) scoped to one FotMob calendar date, and differentiates itself from siblings by naming fotmob_team_fixtures and fotmob_match. The word 'grouped' is a slight ambiguity (grouped by what?), but the overall purpose is unmistakable.

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 routes the agent: use fotmob_team_fixtures for a team's fixture schedule, or fotmob_match for one known match. This gives clear alternatives and the condition that selects this tool (a calendar date). It stops short of stating when not to use it (e.g., relative to league/table tools), so it is strong rather than exhaustive.

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