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

Annotations already declare readOnlyHint, idempotentHint and non-destructive, so safety is covered. The description adds real behavioral context beyond that: data is read from filings and exhibits, the default digest is short, items are dated and cite SEC accession numbers, and `record` yields a point-in-time snapshot. No pagination or rate-limit information, which keeps it short of a 5.

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?

One dense paragraph that is front-loaded with what the digest contains before explaining the modifiers. It is slightly long, but nearly every clause carries information (topics, dating, accession numbers); only the parameter advice mildly overlaps the schema.

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?

There is no output schema, so the description carries the return burden and does so: full digest by default, short, dated index alternative, point-in-time record. Combined with 100% schema coverage and read-only annotations, an agent has everything needed to call 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 100%, so the baseline is 3. The description still adds value over the schema: it spells out the accepted topic vocabulary, notes that `section` accepts a heading with a unique prefix, and clarifies that `index` is dated and one-line. That is meaning beyond the raw field descriptions.

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?

States a specific resource (digest of a company's material current reports, Form 8-K / 6-K) with a clear verb and then enumerates the contents (earnings releases, management changes, dividends/buybacks, debt, M&A, votes, restructuring, legal). An agent can distinguish this from raw-filing siblings like get_filings or get_narrative without opening the schema.

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?

Explicitly describes default behavior (returns the full digest) and the conditions that select each variant: `section` to narrow, `index=true` for a one-line dated index, `record` for an earlier snapshot. It never names a sibling tool as an alternative, so the agent must infer whether to use get_events vs get_filings.

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