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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, openWorld), so the bar is lower, yet the description still adds real value: the credit cost, the default local time zone, the fact that three releases are returned, and the explicit limitation that no figures or forecasts are included. It does not discuss freshness/caching of the schedule or what happens if a date is tentative, which keeps it from 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?

The key information (what it returns, in what detail, and the limits) is front-loaded in the first two sentences, with audience and cost trailing. The audience sentence ('For traders, economists...') is somewhat expendable padding, but overall there is little waste.

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?

With no output schema, the description carries the burden of describing return content and does so concretely: estimate stage, quarter, triple time-zone times, and the following two releases. Combined with the explicit scope limit and cost, an agent has enough to call it correctly; only the handling of tentative/unconfirmed dates is unaddressed.

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 coverage is 100% and the single timezone parameter is fully documented in the schema, so the baseline is 3. The description only echoes that local times are returned 'in your time zone (London by default)', confirming the parameter's effect on the response rather than adding syntax or constraints beyond the schema.

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 opens with an explicit verb+resource question ('When is the next US GDP release?') and then states exactly what is returned: the next scheduled BEA release, its estimate stage (advance/second/third), the quarter, times in Eastern/UTC/local, plus the two following releases. This is clearly distinguishable from siblings such as bea_release_dates_for_year (a yearly calendar) and next_cpi_release (a different indicator).

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 names the audience and the planning use case ('For traders, economists and anyone planning around the GDP print') and states a clear exclusion: 'It gives the schedule only, not the GDP figures or forecasts.' What is missing is an explicit pointer to the alternative tool (bea_release_dates_for_year) when a full calendar is wanted, so the routing is implied rather than spelled out.

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