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

With no annotations, the description carries the burden of behavioral disclosure. It mentions point-in-time by filing date, item code mapping, free access, and a disclaimer ('Not advice'). However, it does not specify return format, pagination, rate limits, or explicitly label the operation as read-only. It adds useful context but lacks some behavioral details.

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 description is two sentences with no redundant text. It front-loads the purpose, gives concrete examples, and includes access notes. The star and emoji are decorative but do not detract. Every sentence adds value.

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 simple two-parameter tool with an output schema, the description covers the purpose, key behaviors, and access. It does not need to explain the return format since the output schema exists. Minor gaps include no mention of result limits or pagination, but these are not critical for basic usage.

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 compensate for parameter meaning. It does not explicitly explain 'since_days' or 'ticker' beyond what their names imply. The description mentions 'recent' and 'point-in-time' which hints at since_days, but does not define it. No format or example values are given, leaving the agent to infer.

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 clearly states the tool's function: fetching recent material events from SEC 8-K filings. It lists specific event types (earnings, exec changes, M&A, restatements) and maps item codes to plain language, making it distinct from other tools that might cover broader fundamentals or sentiment. It is not a tautology and provides concrete examples.

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 description implies use for analysts looking for catalysts and mentions 'point-in-time by filing date', but it does not explicitly state when to use this tool versus alternatives like fundamentals or quote. There is no exclusionary guidance or mention of cases where this tool would be inappropriate. The context is clear but not directive.

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