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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and open-world access are covered. The description adds nothing beyond that — no note on identifier requirements, filing availability, or rate behavior for the EDGAR source.

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 terse fragment with no waste, but its brevity is under-specification rather than efficiency — it conveys almost no actionable content for a 3-parameter lookup tool.

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?

An output schema exists, so return values needn't be explained, but for a tool with three undocumented parameters at 0% coverage and no usage guidance, the description leaves the agent without enough to invoke it correctly.

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 0%, so the description must carry the burden for cik, ticker, and accession, but it mentions none of them. It gives no hint that accession is required or that cik/ticker are alternate identifiers, leaving all three parameters undocumented.

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?

Names the resource (SEC EDGAR filing) and scopes it to a 'single filing detail', which hints at a fetch-one-by-identifier operation distinct from search/list siblings like sec_full_text_search. However the verb is left implicit and the phrase 'single filing detail' is a noun fragment rather than a clear action statement.

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 when-to-use guidance and no named alternatives among the many sec_* siblings (sec_filing_sections, sec_full_text_search, sec_company_submissions). The agent must infer from the name alone that this retrieves one filing rather than searching or listing.

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