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

With no annotations, the description must carry the full behavioral burden. It mentions Open-Meteo as the source, but does not disclose that this likely performs an external network request, which parameters are actually used, or what the output format is. The unrelated parameters in the schema further obscure behavior.

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 clear sentence with no filler. It is appropriately concise, though given the nine-parameter schema, slightly more structure about the primary parameter would have been helpful.

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 has nine optional parameters, no required parameters, no annotations, and no output schema. The description only identifies city as the relevant input, leaving significant ambiguity about whether other parameters are accepted, ignored, or affect behavior. An agent could reasonably pass the wrong parameter.

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%, so the baseline is 3. The description names 'city' but adds no detail beyond the schema's own parameter description. It also fails to clarify why many seemingly unrelated parameters exist.

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 tool returns the current temperature for a city and names the data source (Open-Meteo). It is distinguishable from siblings like geo-hint or lib-docs-hint, though it lacks an explicit action verb.

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 the tool should be used when an agent needs the current temperature for a city. However, it provides no explicit guidance about when not to use it or how it compares to alternatives such as geo-hint.

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