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

No annotations are provided, so the description carries the full burden. It only says 'retrieve dates' and does not disclose what input is required (CIK), what exact dates are returned (filing date vs period of report), or any pagination/error behavior. The read-only nature is only implied by the verb 'retrieve'.

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 first sentence is serviceable and front-loaded, but the second sentence is marketing language ('This is crucial...') that does not help an agent invoke the tool. The description is short but wastes a sentence on generic value statements.

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 one-parameter tool with no output schema or annotations, the description should clarify what the returned dates represent (e.g., filing date vs period of report) and that the CIK identifies the institutional investor. It does not, leaving the description incomplete for 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?

The only parameter, cik, is fully described in the schema as 'CIK number,' and the description adds no additional meaning about how CIK relates to the tool or how to format it. Since schema coverage is 100%, the baseline of 3 applies.

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 the tool 'retrieve[s] dates associated with Form 13F filings by institutional investors'—a specific verb and resource. However, it does not distinguish the tool from siblings like getFundDisclosureDates or getFilingsByCIK, and it omits that the input is a CIK.

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 second sentence provides clear context: the tool is useful for tracking institutional stock holdings at specific points in time. It does not, however, explicitly mention alternatives or when-not-to-use conditions, so it stops short of full selection guidance.

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