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

The annotations provide readOnlyHint=true, indicating this is a safe read operation. The description adds value by explaining that location names are automatically converted to grid identifiers, which is useful behavioral context not covered by annotations. However, it does not disclose other potential traits like rate limits, error handling, or data freshness, leaving some gaps in transparency despite the annotation support.

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 concise and well-structured, consisting of two sentences that efficiently convey the tool's purpose and key behavioral detail (automatic conversion of location names). Every sentence adds value without redundancy, and the information is front-loaded, making it easy to grasp quickly. There is no wasted verbiage or unnecessary elaboration.

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?

Given the tool's moderate complexity (2 parameters, 1 required), the presence of annotations (readOnlyHint), and an output schema (which handles return values), the description is reasonably complete. It covers the core functionality and a key behavioral aspect (location conversion). However, it could be more comprehensive by addressing potential limitations or usage nuances, such as the scope of supported locations or the role of the optional region 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%, meaning the input schema fully documents both parameters (location and region). The description adds semantic context by clarifying that location names are accepted and automatically converted to grid identifiers, which enhances understanding beyond the schema's basic description. This provides some added value, but since the schema already covers the parameters well, the baseline score of 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 clearly states the tool's purpose: 'Get current weather information for a Dutch location.' It specifies the verb ('Get'), resource ('weather information'), and geographic scope ('Dutch location'), making it easy to understand what the tool does. However, since there are no sibling tools, it cannot demonstrate differentiation from alternatives, which prevents a perfect score.

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 usage by specifying 'for a Dutch location,' which sets a geographic context. However, it does not provide explicit guidance on when to use this tool versus alternatives (e.g., other weather tools or methods), nor does it mention any exclusions or prerequisites. With no sibling tools, the lack of comparative guidance is less critical, but the description still only offers implied context without clear when/when-not instructions.

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