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

With no annotations provided, the description carries full burden for behavioral disclosure. It doesn't mention that from/to dates are required, that results are paginated, or what the return structure looks like. It also doesn't explicitly confirm this is a read-only operation, though it implies search.

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 two sentences and front-loads the key purpose. The second sentence adds some redundancy but is still concise and readable.

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?

The description is complete enough to understand the tool's basic function, but it misses critical context such as the requirement to provide from/to dates and the pagination behavior. Given the tool's simplicity and lack of output schema or annotations, the missing context is a notable gap for successful 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?

Schema coverage is 100%, so the baseline is 3. The description doesn't add parameter details beyond what the schema already provides, but since the schema descriptions are clear, no penalty is applied. It could have mentioned the required date range, but that is already in the schema.

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 searches for SEC filings by CIK number, using a specific API. It differentiates from siblings like getFilingsBySymbol or getFilingsByFormType by explicitly emphasizing the CIK lookup method.

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 implies usage when you have a CIK and want to track a company's filings, but does not explicitly state when to use this instead of other filing tools or exclude alternatives. Sibling context shows many comparable tools, so more explicit guidance would have been helpful.

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