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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint=false. The description adds useful domain behavior beyond annotations: it defines all-in price composition, excludes fixed monthly charges, and clarifies spot price meaning. It does not cover error behavior, but for a simple read-only tool this is strong added context.

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 core action and return values are front-loaded in the first sentence, followed by precise definitions of all-in and spot pricing. Every sentence adds useful meaning, with no redundant or filler content.

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, so the description must explain return contents; it does so clearly by naming all-in household price and wholesale spot price, per kWh, in local currency and EUR. It also defines scope and exclusions sufficiently for a one-parameter read-only tool.

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%, and the market parameter is fully documented in the schema, including examples and a reference to list_markets. The description adds no additional parameter semantics beyond that, so the baseline of 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?

States a specific verb ('Gets') and resource ('electricity price for the current delivery period') and identifies both returned price types. It is clear on its own, but does not explicitly differentiate itself from sibling tools like get_prices or compare_markets.

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 a single market's current delivery slot, but gives no explicit when-to-use or when-not-to-use guidance. It does not route the agent between this tool and siblings such as compare_markets or get_prices.

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