get_currency_rate

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

No annotations are provided, so the description carries the full burden. It does state that the result includes the ruble rate and the day's change, but it does not disclose the return structure, default date behavior, error handling, or any permission/read-only details. This leaves the behavior under-specified.

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 description is a single compact sentence with no redundant wording. It states the core purpose and the additional daily-change detail without wasting tokens.

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?

The tool is simple and the schema covers the parameters, but there is no output schema, no annotations, and no explanation of return values or edge cases. The description gives the basic rate-and-change concept, but an agent is left without enough context for confident usage or selection among closely related siblings.

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?

The schema already documents both parameters with 100% coverage. The description adds the useful clarification that the rate is against the ruble, but it does not add meaningful details about the date format or currency code beyond what the schema already provides.

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 clearly states the resource: the rate of a specific currency against the ruble, and adds the 'change over the day' detail. It distinguishes itself implicitly from siblings like get_daily_rates and get_rate_dynamics, but it does not explicitly name any alternative.

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?

No guidance is given for when to use this tool instead of sibling tools such as get_daily_rates, get_rate_dynamics, or convert_currency. The phrase 'конкретной валюты' implies single-currency use, but there is no explicit when-to-use or when-not-to-use guidance.

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