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

No annotations are provided, so the description carries the full disclosure burden. It does state a server-side cap ("up to 2000 from HL"), but leaves key traits unstated: what "Recent" actually means (time window vs. row cap), ordering, pagination behavior past 2000, and whether the call is read-only.

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 short sentences with the resource and the distinctive return field front-loaded; no filler. Slightly compressed to the point where the usage sentence could have carried the missing recency semantics at no extra length cost.

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?

The description names the key return field (closedPnl), which partly compensates for the absence of an output schema, and gives the 2000 cap. However, with no annotations and an undocumented walletId, the definition is not complete enough for an agent to call it confidently in ambiguous cases.

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 only 50% — limit is documented in the schema, but walletId has no description anywhere. The description's "up to 2000 from HL" merely restates the limit constraint already in the schema and adds no meaning for walletId (e.g., accepted format, whether it must belong to the caller).

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 uses a specific verb+resource ("Recent Hyperliquid trade fills") and adds a distinguishing payload detail ("closedPnl per fill"), which separates it from balance/position siblings. It does not explicitly distinguish itself from the similarly named get_hyperliquid_history, so an agent must infer the boundary.

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?

"Use for P&L review and trade history" gives implied usage context, but it never names an alternative (get_hyperliquid_history, list_hyperliquid_positions) or states when-not to use it. The guidance is adequate but leaves the agent to infer routing among several Hyperliquid read tools.

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