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

With no annotations, the description must disclose behavior but only states the output. It does not mention whether it makes external network calls, rate limits, error conditions, or that most parameters are discarded. The schema hints at a test-like nature, but the description fails to clarify.

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 short sentence, which is concise, but it omits crucial information about the multi-purpose schema. It is under-specified rather than efficiently comprehensive, so a 3 reflects the trade-off.

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 tool with 9 parameters and no output schema, the description is highly incomplete. It does not explain the return format, when to use which parameter, or how the weather hint relates to the other parameters. An agent would be confused about what to provide.

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% with detailed descriptions for each parameter, so the baseline is 3. The tool description adds no additional meaning for parameters beyond the schema, and the city parameter is the only one referenced. Given the schema already provides clear semantics, a 3 is appropriate.

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 clear purpose: returning current temperature for a city via Open-Meteo. However, the input schema includes 9 unrelated parameters (ref, url, feed, host, json, path, zone, query) with descriptions suggesting other functions, creating a mismatch. This ambiguity reduces clarity about what the tool actually does.

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 like geo-hint or web-fetch. The description does not mention exclusions, prerequisites, or typical use cases, leaving the agent without direction.

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