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

With no annotations, the description carries the full burden and does well: it discloses ordering, included record types, key fields, the limit ceiling, since semantics, and that a summary is returned. It does not mention auth requirements, rate limits, or whether since is inclusive/exclusive, leaving some operational details implicit.

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?

The description is front-loaded with the core purpose, then compactly enumerates the returned activity and constraints. No sentence is wasted, and the sibling redirection is placed efficiently at the end.

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?

There is no output schema or annotations, so the description appropriately describes the returned activity types and summary. It is nearly complete, but the account parameter format and some pagination semantics remain unspecified.

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 0%, so the description must compensate. It explains limit as at most 500 and since as unix seconds, but it does not explain the required account parameter at all, leaving one of three parameters semantically undocumented.

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 and scope: past account activity, newest first, including fills, settlements, redeems, and a summary. It also explicitly distinguishes the tool from get_positions, so an agent can identify it without opening the schema.

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?

It establishes clear usage context by emphasizing PAST activity and explicitly redirecting open-position queries to get_positions. It does not discuss other potentially related siblings such as get_pnl, but the primary exclusion is stated.

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