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

With no annotations, the description carries the full burden. It discloses the cost of 80 sats per call, which is a behavioral trait. The description implies a read-only lookup, but does not explicitly state side effects, error handling, or dependencies. The cost mention adds value, but the overall behavioral disclosure is minimal.

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 sentence, front-loaded with the core functionality and followed by the cost. Every word earns its place, with no redundancy or filler. It is an ideal length for a simple tool.

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 is simple, has one optional parameter, and no output schema. The description explains what the tool returns (time, geolocation, weather) and covers the input scope. It lacks details like error cases or output formatting, but for a straightforward lookup, it is sufficiently complete.

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 input schema is fully self-descriptive: the only parameter 'ip' is explained as optional and defaults to the caller IP. The description adds no additional parameter semantics beyond what the schema already provides. With schema coverage at 100%, 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 function: providing UTC time, geolocation, and weather for any IP address. It distinguishes itself from sibling tools by focusing on worldstate data rather than prices, domain intel, or translation. However, it lacks an explicit verb like 'get' or 'retrieve', so it stops short of a perfect 5.

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 usage is implied: if you need time, location, or weather information for an IP address, this is the tool to use. There is no explicit comparison to alternative tools or exclusion of when not to use it. The description gives a clear context but no direct guidance on choosing this over a sibling.

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