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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds useful scope (football TV schedules, public listings), but says nothing about what the selector returns, whether it is static, or ordering — modest value beyond the annotations.

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?

A single short sentence with no filler, and the domain qualifier is placed after the resource. It is efficient, though the missing verb makes it slightly less immediately actionable than it could be.

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?

An output schema exists, so return values need not be explained, and the zero-param read-only nature keeps the surface small. Still, for a selector tool the description does not confirm it enumerates the country codes needed by the TV guide siblings, leaving the agent to guess its role in the workflow.

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 tool takes zero parameters, so the baseline is 4. The description appropriately does not discuss inputs, and there are no parameter semantics to clarify.

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 names the resource (a country selector) and its domain (public football TV schedules), which distinguishes it loosely from fotmob_tv_guide_channels. However, it uses a noun phrase with no verb, leaving it implicit whether the tool lists countries, validates them, or filters the guide, so the exact operation is not 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?

There is no guidance on when to call this tool, nor any mention that it likely supplies the valid country values consumed by fotmob_tv_guide or fotmob_tv_guide_channels. The relationship to those siblings is left entirely to inference.

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