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

Annotations already establish read-only, idempotent, non-destructive behavior. The description adds meaningful behavioral context beyond the schema by explaining what each lens produces and what interval granularities are available. It does not discuss output shape or aggregation details, but the annotations lower the bar here.

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 three concise sentences: the first front-loads the purpose, and the next two compactly explain the lens values and interval options. Every sentence contributes useful information with no wasted words.

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 tool with seven parameters, the description plus a fully described schema is mostly sufficient. It explains the central lens and interval semantics, and parameter descriptions cover the rest. However, it does not describe return-value structure or how product/sub_lens interact with lenses, leaving minor gaps.

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 100%, so the baseline is 3. The description adds genuine meaning to the lens parameter by specifying what each value shows, and clarifies trend_interval choices. It does not elaborate on date bounds, product, or sub_lens, but those already have self-explanatory schema descriptions.

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 clearly states the tool returns time-series trends of complaint volume and enumerates the lens options (overview, product, company, issue). It does not explicitly contrast itself with sibling tools like cfpb_complaint_aggregations or cfpb_state_complaints, so it misses full sibling differentiation.

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?

The description provides no guidance on when to use this tool instead of the other CFPB complaint tools, and it does not mention alternatives or exclusions. The time-series framing implies temporal analysis, but there is no explicit decision guidance.

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