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

Annotations already indicate readOnly, idempotent, and non-destructive behavior. The description adds meaningful context by revealing response contents: previous-quarter exits, reported value, shares, fund weight, and action. It also clarifies that the quarter can be the latest one or a requested one.

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 a single, well-structured sentence that front-loads the core purpose and then lists the most relevant output fields. There is no redundant or filler wording.

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 read-only paginated lookup tool, the description covers the main input semantics and even hints at the output fields despite having no output schema. The main missing piece is explicit routing guidance against closely related 13F tools, but the description is otherwise sufficient for correct invocation.

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?

With only 25% schema description coverage, the description partially compensates by clarifying the ticker scope and the 'latest or requested quarter' behavior. However, it does not explain the quarter format, the limit maximum of 25, or the offset pagination semantics beyond the word 'Page'.

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 ('Page') and a clear resource ('funds holding one ticker'), and it names the quarter scope. It is distinguishable from siblings like sec.filings or insider_transactions, though it does not explicitly contrast itself with sec.thirteenf_crowding or company.holders.

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 guidance about when to use this tool versus alternatives such as sec.thirteenf_crowding or company.holders. The description only states what the tool does, not when it is the right choice or when another tool should be used instead.

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