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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds genuine context beyond that by narrowing scope to executed (not open/cancelled) fills for the subaccount. It says nothing about pagination, default result size, or sort order, so it does not go far beyond the annotation baseline.

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 well-formed sentence with the core action front-loaded and no filler. It is appropriately sized, though it spends its words on return fields rather than the parameters that need explanation.

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 no output schema, the description usefully names key returned fields (price, size, fee, maker/taker liquidity). However, it omits pagination behavior and default limit semantics for a paged list tool, leaving real gaps for a 3-parameter endpoint.

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 only 33% (only 'market' is documented), so the description must compensate for page and limit, and it does not — neither parameter is referenced. The field list describes return values, not the input parameters.

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 and resource ('Get executed fills') plus the scope ('for the subaccount') and enumerates the returned fields. An agent can distinguish this from get_open_orders or get_orderbook, though the description never names those siblings to reinforce the distinction.

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 explicit when-to-use statement, no exclusion against alternative history/order tools, and no mention of prerequisites or how to page through results. 'Executed fills' only implicitly suggests historical trade lookup rather than open orders.

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