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

Annotations already declare readOnlyHint and openWorldHint, so the safety and reach profile is covered. The description adds that this is a directory listing whose output feeds downstream calls, but says nothing about auth, rate limits, or result shape (though an output schema exists). Adequate but not rich.

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?

Two sentences with no waste: the purpose leads, the workflow routing follows. Every clause carries information.

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?

For a parameterless directory tool with an output schema and annotation-covered safety profile, the description supplies everything needed: what it lists and how to use the result. Nothing an agent needs to invoke it correctly is missing.

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?

Zero input parameters, so there is nothing to document and the baseline is 4. The mention of a 'returned country code' refers to output, not input, and does not affect input semantics.

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 (List) and resource (country directory for FotMob's public football TV guide), and explicitly distinguishes itself from the sibling tools that consume its output. An agent can tell what it returns and how it differs from fotmob_tv_guide and fotmob_tv_guide_channels without opening either schema.

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?

Names the exact next step and the two alternative tools to route into, with the condition (pass a returned country code) that selects each. This makes the tool's role as a prerequisite lookup unambiguous.

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