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

Annotations already establish readOnly, idempotent, non-destructive, closed-world behavior, so the description's added value is the pagination cap of 5000 rows and the as_of clipping semantics. The page limit is genuinely useful planning information not present in annotations, though it omits ordering and what the rows contain.

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 compact sentence with the scope stated first and the volume constraint last; every clause carries information and nothing is padded.

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?

No output schema exists, so the description should say more about the shape of returned rows (columns, aggregation levels) and it mentions a 5000-row page cap without any offset/cursor parameter being available. Adequate for basic invocation but leaves real gaps for a data-retrieval tool.

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 25%: as_of is documented but start, end, and market are bare strings with no format guidance in either schema or description. The description only restates that start/end bound the range and that market selects a market, adding nothing on expected formats or identifiers.

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 ('Returns') and a specific resource ('CFTC Commitments of Traders rows') scoped by market and date range. The resource is distinctive from siblings like get_futures or get_bars, though the description never explicitly names the boundary between them.

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?

No statement of when to use this versus alternatives such as get_futures or get_macro_vintage, and no prerequisites or exclusions. The agent must infer usage entirely from parameter names.

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