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 informational scope it returns, but no behavioral traits such as pagination, rate limits, or whether market values are billable/heavy. Adequate given annotations carry the safety burden.

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 that leads with the resource and follows with contents. It is efficient, though the trailing content list is somewhat loose and could be tightened without loss.

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?

An output schema exists, so return-shape explanation is not required, and annotations cover the read-only/open-world profile. For a straightforward id-based profile lookup the description plus structured fields are sufficient, with only the lack of sibling routing as a minor gap.

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%, with the id parameter documented as a numeric FotMob id from fotmob/search and include_market_values documented with its default. The description contributes only the passing mention of 'player-specific season ids' and adds no new meaning beyond the schema, so 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 states a specific resource (FotMob public player profile) and enumerates the concrete contents (injury info, recent matches, career history, trophies, market values, season ids), so an agent knows what comes back. It distinguishes itself from narrower siblings like fotmob_player_stats or fotmob_player_matches by being the broad profile. It stops short of explicitly naming those siblings, so not a 5.

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 or when-not-to-use guidance and no named alternative. Nothing tells the agent to pick this over fotmob_player_stats or fotmob_player_matches when it wants a specific slice of data. The dependency on a search-derived id appears only in the schema, not the description.

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