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

Annotations already carry readOnly, idempotent, openWorld and non-destructive hints, so the bar is lower. The description still adds genuine context beyond them: the reply opens with a one-line answer plus date, rows link back to filings, source is SEC EDGAR, and the licence is CC BY 4.0.

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 question is well front-loaded, but the remainder is a chain of fragments ('Cyber Disclosures.', 'SEC 8-K Items 8.01 and 7.01 · cybersecurity incidents disclosed voluntarily · the filer's own sentence.') that read as marketing copy rather than operational detail.

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 a single optional parameter, no output schema, and full annotation coverage, the description supplies what an agent otherwise lacks: the shape of the answer (one-line answer + date, per-row filing links) and provenance. Missing only explicit guidance on when a different disclosure tool would be the better pick.

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?

Only one optional parameter and its schema description already covers default 50, ceiling 200, and the total/returned/truncated reply metadata, so the schema does the heavy lifting. The description restates the truncation/more-link behaviour rather than adding new syntax or format detail, which is the expected baseline 3.

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?

Opens with a concrete question ('Which public companies disclosed a cybersecurity incident voluntarily, without declaring it material?') that pins down both the verb (disclose) and the exact SEC filing subset (8-K Items 8.01/7.01). The 'voluntarily, not declared material' qualifier implicitly separates it from a material-breach sibling like get_breaches, though no sibling is named explicitly.

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 framing as a question implies the situation in which to reach for it, and 'voluntarily, without declaring it material' scopes it against material-incident lookups. But there is no explicit when-to-use/when-not-to-use instruction or named alternative among the many sibling tools.

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