Electricity prices

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

Annotations already cover readOnlyHint and openWorldHint. The description adds meaningful context: price granularity, exclusion of tariffs/taxes/VAT, and the release schedule. It does not describe response format or pagination, but with annotations covering safety and time-variance, the added details are sufficient.

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 tight sentences. The first sentence establishes purpose, resolution, and value-add; the second conveys temporal coverage and pricing basis. No filler, all information earns its place.

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 retrieval tool with full schema coverage and annotations, the description is adequate. It explains the temporal scope and what the prices exclude. The absence of an output schema is offset by the include_periods parameter and mention of summaries. Slight room for improvement in stating return structure, but not a critical gap.

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%, so all four parameters (end, start, price_areas, include_periods) have detailed descriptions. The tool description adds context about 15-minute resolution and summary availability but does not specifically elaborate on parameter syntax beyond the schema. Baseline 3 applies.

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 and resource: 'Day-ahead electricity spot prices in 15-minute resolution' with added value of cheapest/most expensive periods. This clearly distinguishes it from siblings like get_carbon_intensity and get_power_system_now, which target different data domains.

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 usage for day-ahead electricity pricing and notes the publication timing ('once published in the early afternoon, tomorrow'), giving temporal context. It does not explicitly name alternatives or exclusions, but the resource focus is unambiguous, so the gap is minor.

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