fx_rates

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

With no annotations, the description carries the full burden of behavioral disclosure. It provides no information about side effects, rate limits, data freshness, or return behavior. It is merely a noun phrase describing the data source, not what the tool does.

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 extremely brief, which is concise, but it consists of a fragment rather than a complete sentence. It lacks structure and cannot be considered well-formed for the purpose of informing an agent.

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 or annotations, and the description adds almost no value beyond the tool's name. It fails to explain what parameters do, what response to expect, or any usage context, making it inadequate for a tool with two undocumented parameters.

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 has two parameters (base, symbols) with zero description coverage. The description does not mention them at all, leaving their meaning and format completely unexplained.

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 identifies the tool's subject (ECB reference FX cross-rates) and source (Frankfurter), which distinguishes it from siblings like kzt_rates. However, it lacks an explicit verb like 'get' or 'retrieve', so it falls short of a fully specified purpose.

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 provided on when to use this tool versus alternatives. It does not mention that this covers ECB rates only, nor does it exclude cases where kzt_rates or other tools would be more appropriate.

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