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

Annotations already declare readOnlyHint=true and openWorldHint=true, covering the safety profile. The description adds essentially nothing behavioral beyond that: no mention of pagination limits (page goes 1-200, 50 records each), no data freshness, and the content-type list merely restates the mode parameter. It does not contradict 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?

A single front-loaded sentence with no filler. The trailing filter enumeration is slightly list-like but earns its place by signaling the tool's breadth. Efficient and appropriately sized.

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?

For an 11-parameter tool the description is thin on usage context, but the schema is 100% covered, an output schema exists, and annotations carry the safety profile, so most structured information is already present. What is missing is the when/when-not routing an agent would need to pick this over siblings.

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 all 11 parameters in detail. The description's phrase 'time, league, team, direction, fee, and sort filters' just names categories that map to parameters already fully described, adding no syntax, defaults, or unit detail beyond the schema. 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?

The description names the specific resource (FotMob transfers) and the three content types it returns (confirmed, rumours, popular), plus the filterable dimensions. It clearly identifies what the tool fetches, though it uses a noun-phrase rather than verb+resource and never names a sibling to distinguish from (no other transfer tool exists in the list).

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 when-to-use guidance, no prerequisites, and no mention of alternatives. It lists available filter categories but does not tell the agent under what circumstances this tool is the right choice versus sibling tools like fotmob_team_news or fotmob_search.

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