get_fpl_transfer_trends

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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds meaningful context beyond them: 'live' signals fresh/non-cached data, and it names the specific derived signals returned, including 'Bandwagon Trap warnings' for injured, doubtful, or 4-yellow-card assets. It stops short of saying how fresh 'live' is or how the trap warnings are computed.

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?

One sentence, front-loaded with verb and resource, then a compact enumeration of output categories. Every clause carries information; the only minor cost is that the trailing 'Bandwagon Trap' clause is dense jargon that could be slightly clearer.

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 a low-complexity tool with one optional parameter and no output schema, the description does the necessary work by listing what comes back across the four categories. The absence of any usage guidance is the only real completeness 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 coverage is 100% and the single 'limit' parameter is fully documented in the schema as rows per category with a default of 15. The description adds nothing about limit, which is acceptable at this coverage level, but it also doesn't clarify that the limit applies uniformly across the four categories.

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 ('Retrieve') plus a precise resource ('live 2026/27 FPL Gameweek transfer momentum') and then enumerates the four return categories. That level of detail makes it distinguishable from sibling get_transfer_rumours (real-world news) even though the sibling is not named explicitly.

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, when-not-to-use, or alternative-tool guidance at all. An agent must infer from the domain wording that this is for fantasy-manager transfer-decision context rather than news, and nothing tells it whether to prefer get_fpl_gameweek_briefing or get_transfer_rumours for adjacent questions.

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