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

Annotations already establish a safe read-only, open-world lookup, and the description adds real operational context: a paid-tier requirement, a 2-credit cost per request, and the underlying GET route. What it omits is error behavior when no paid plan is active and how partial location inputs are resolved.

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?

Roughly three telegraphic segments, all front-loaded: what it returns, the endpoint, the cost. Nothing is redundant, though the fragment style reads as a keyword dump rather than flowing guidance.

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?

With seven optional parameters, no required fields, and no output schema, the description covers pricing and payload scope but leaves the caller to work out how to select a location and how to bound the forecast window. Adequate for a weather lookup, but not self-sufficient for a first correct call.

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 a moderate 71%, so several parameters are already documented and the baseline of 3 applies. The description adds nothing about parameter interplay, notably that 'il'/'ilce'/'konum' form one locator mode while 'enlem'/'boylam' form another, nor how 'gun' and 'saat' constrain each other.

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?

Names the resource and enumerates the distinctive payload it returns (feels-like, dew point, pressure, visibility, gusts) plus the 16-day horizon, which separates it from the plain 'hava' sibling. It never explicitly names that sibling or says how the two differ, so differentiation is implied rather than stated.

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 'Ücretli paket gerekir' note functions as a gating condition, telling the agent this call is only usable on a paid plan, and 'İstek birimi: 2 birim' signals a higher-cost call. There is no explicit statement of when to prefer this over 'hava' or which location-input mode to choose, so usage is only inferable.

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