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

Annotations already declare readOnly, idempotent, non-destructive and open-world behavior, so the safety profile is covered. The description adds the 'recent EDGAR window' scoping trait, which is genuine behavioral context, but the enumerated return fields largely duplicate the existing output schema rather than disclosing new traits like auth or rate-limit behavior.

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?

Three sentences, front-loaded with the usage trigger and then the return shape; each sentence carries information. The return-field enumeration is somewhat redundant against the output schema, which costs it the top score.

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?

With an output schema present, the definition need not explain return values, yet it still covers the use case, identifier options and result cap. The main gap is that it omits any mention of the 'limit' parameter's default or interplay with the 20-filing ceiling.

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 33%, so the description is expected to compensate. It clarifies that the identifier can be a ticker or CIK and implies the form-type filter via examples, but it never mentions the 'limit' parameter or the full enum (20-F, 40-F, /A variants), leaving gaps the schema only partially fills.

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 names a specific verb ('list/ask for') and resource ('a company's recent SEC filings') with concrete examples (10-K, 10-Q, 8-K), so the agent knows exactly what comes back. It does not explicitly contrast itself with siblings like read_filing_section or filing_facts, so it stops short of 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?

'Use when someone asks for a company's recent SEC filings ... by ticker or CIK' is an explicit trigger condition, giving the agent a clear activation context. There is no when-not guidance or naming of the alternative tools (read_filing_section, filing_facts) for deeper lookups, so it is clear context without exclusions.

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