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

Annotations already declare readOnly/idempotent/non-destructive/openWorld=false, so the safety profile is covered. The description adds genuinely new context: results are limited to models the key is permitted to use, prices are public USD figures, and the call is free ('costs nothing'). It does not describe pagination or truncation 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 English portion is front-loaded and efficient: capability, filters, cost, then the chaining hint. The trailing Persian sentence mostly duplicates the English content, which adds bulk without new information, though it plausibly serves localization.

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 no output schema, the description usefully states what comes back (model list with public USD prices, and an `id` field to reuse). For a simple read-only list tool that is nearly complete; only the `limit`/pagination dimension and full return shape are left unstated.

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 67%; `type` and `search` are already documented in the schema, and the description largely restates the enum values rather than adding semantics. The third parameter, `limit`, is unmentioned in both description and schema description, so the description does not compensate for that gap.

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?

States a specific verb and resource ('List the AI models'), scopes it to what 'this Gisoo key may call', and adds that prices are returned. It is instantly distinguishable from the sibling tools, which all invoke models rather than enumerate them.

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?

Explicitly routes the agent onward: 'Use the returned `id` as the `model` argument of the other tools', which tells it when this tool is a prerequisite step. Filter usage ('by type ... and/or a search word') is also described. It stops short of naming when-not to call it or which sibling to prefer once an id is known.

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