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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, so safety behavior is covered. The description adds useful context beyond annotations: it says the service is free, license-cleared, attribution-required, names the source systems, and notes that detection timestamps are measured by cev-os. It still does not describe rate limits or response structure in detail.

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 front-loaded with the usage trigger and return information, then moves into licensing/provenance details. It is somewhat dense and includes legal boilerplate, but the attribution block is relevant to use and nothing is seriously redundant.

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 read-only status lookup with full schema coverage and no output schema, the description covers the key return concepts: whether a release is out, when it was first seen, and actual/prior/revision values. It also covers provenance and licensing. Minor gaps remain around explicit sibling differentiation and output formatting, but the essential invocation context is present.

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 schema already documents all four parameters, including date patterns, event types, and ticker behavior. The description reinforces the event categories and earnings use case, but does not add syntax, defaults, or constraints beyond what the schema provides.

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 states a specific verb/resource: checking whether a scheduled US release or an S&P 100/NASDAQ-100 earnings 8-K is out, plus first-seen timing and actual/prior/revision values. It is clear enough to distinguish the core function, but it does not explicitly contrast itself with siblings such as get_macro_calendar or get_earnings_reactions.

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?

It gives an explicit trigger: 'Use this when you need to know whether...' and lists the covered release categories and earnings type. It does not specify when not to use it or name alternative tools for calendar-style or reaction-style queries.

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