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 without the description. The only added behavioral hint is 'grouped', which implies the response is bucketed rather than a flat list, but it does not say by what, so the added value is marginal.

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 four-word fragment with zero waste and the key noun front-loaded. It is efficient, though it borders on under-specification rather than true conciseness, since there was room to explain 'grouped' without bloat.

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 parameters and an output schema present, the description needn't explain return values, so the bar is low. Still, for a directory tool in a namespace containing cricinfo_team, cricinfo_squads and cricinfo_grounds, it omits the grouping key and scope (international vs domestic teams), leaving an agent to guess at what the directory contains.

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 and the schema is trivially empty, so there is nothing for the description to disambiguate. Baseline 4 applies; no parameter guidance is needed.

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 ('team directory') and a qualifier ('grouped'), so an agent can tell it lists teams rather than a single team. However, 'grouped' is never explained (grouped by country? by series? by format?), and it does nothing to distinguish itself from the sibling cricinfo_team, which appears to be the single-team counterpart.

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 statement of when to call this tool, what prerequisites exist, or how it differs from cricinfo_team or cricinfo_squads. The agent is left to infer that this is a browse/list entry point from the word 'directory' alone.

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