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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and scope are covered. The description adds 'Free', a pricing/cost trait not present in the structured fields, but says nothing about pagination, refresh cadence, timezone/timestamps, or rate limits despite the open-world data source.

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?

Two compact sentences, no filler, with the resource enumeration and the optional filter both front-loaded. Every clause carries information.

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 two-param, read-only listing tool with annotations covering safety and a schema covering both parameters, the definition is nearly sufficient. Minor gaps remain — no mention of time horizon semantics beyond the schema's day range, and no hint about the shape of returned events — but nothing an agent needs to call it is missing.

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 both parameters (days range/default 14, market string) are fully documented in the schema; baseline is 3. The phrase 'filtered to what affects one market' adds a small interpretive nudge about the market parameter's purpose but no format or syntax detail beyond the schema example.

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 names the resource (scheduled market-moving releases) and enumerates concrete examples (Fed decisions, CPI, jobs report, PPI, JOLTS, EIA oil/gas), so an agent knows exactly what it returns. It does not explicitly contrast with any sibling, but the siblings are functionally unrelated (trading/positioning tools), so disambiguation is not really at risk.

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?

Usage is implied by the content — this is the tool for looking up upcoming scheduled releases — and 'Optionally filtered to what affects one market' hints at the filter case. However, there is no explicit when-to-use guidance, no prerequisites, and no named alternative, leaving the agent to infer the scenario.

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