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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint, so the safety profile is covered. The description adds two genuinely useful operational facts not in annotations: the service is free and requires attribution to listed sources. However it says nothing about result volume, ordering, or how 'impact tier' is assigned.

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 trigger condition is front-loaded well, but roughly half the text is licensing/attribution boilerplate (source list, BEA disclaimer) that is administrative rather than selection-relevant. The useful capability information is compressed into one long clause while the legal text gets equal space.

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, and the description does convey what a result contains (events of five kinds, each with an impact tier), which is the key missing piece. Remaining gaps – no pagination/limit note, no ordering, no explicit sibling routing – are modest for a zero-required-parameter calendar lookup.

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%, with hours range, kinds enum values, min_tier enum and include_estimated default all documented in the schema. The description only echoes the 'next hours' window and 'impact tier' concept, adding no syntax or defaulting detail beyond the schema – 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?

States a specific verb and resource: returns market-moving events (US macro, FOMC, Treasury auctions, earnings, options expiry) over a look-ahead window, each tagged with an impact tier. The event-type enumeration makes the scope concrete, but it never names the obvious sibling (get_macro_calendar) that overlaps with its 'macro' and 'fed' kinds.

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?

'Use this when you need to know whether the next hours contain a market-moving event' gives a clear trigger condition, but there are no exclusions and no alternatives are mentioned despite several calendar/regime siblings. An agent must infer on its own why it would pick this over get_macro_calendar.

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