get_api_status

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

With no annotations present, the description carries the full disclosure burden and adequately does so: it tells the agent that this is an unauthenticated read-style status operation and specifies exactly what freshness data it exposes. It omits details about error or caching behavior, but that is a minor gap for a zero-parameter status endpoint.

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?

A single sentence conveys purpose, scope, and auth requirement without wasted words. The parenthetical list of freshness fields is compact and front-loaded.

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 zero-parameter, no-output-schema tool, the description is nearly complete: it states what the tool returns, the service scope, and the lack of an auth requirement. It would be slightly stronger if it explicitly distinguished itself from get_key_status, but that ambiguity is minor.

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?

There are no parameters, so the schema already trivially covers all inputs. The description adds the relevant auth-related input condition, 'No API key required', which is the only meaningful invocation consideration.

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 the active verb 'Get' and names a specific resource: Rate-API service status and rate-data freshness. It further lists concrete outputs (currency count, last update, age) and distinguishes itself from key-specific siblings by noting no API key is required.

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 use as a public health/freshness check and states that no API key is required, which signals ubiquity. However, it never names sibling tools such as get_key_status or states when not to use this tool, leaving the routing decision partially to inference.

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