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

With no annotations, the description must disclose behavioral traits itself. It does state that the tool works offline and handles bidirectional IDN/Punycode conversion plus homograph checking, but it omits important details like expected input format, output shape, and behavior on invalid or mixed-script input.

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 description is a single compact sentence with no filler. The key facts—IDN/Punycode conversion, homograph checking, and offline operation—are front-loaded and every part earns its place.

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 one-parameter tool with no annotations, the description is too thin. Although an output schema exists, the parameter semantics are completely unexplained, and the homograph-check behavior is vague. An agent would likely need to guess acceptable input formats and result interpretation.

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 schema has a single parameter 'q' with no description, and schema description coverage is 0%. The tool description never explains what 'q' should contain, whether it accepts IDN, Punycode, or both, or how the default empty string is handled. The description does not compensate for the missing parameter documentation.

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 a specific resource and operation: converting between IDN domains and Punycode (xn--) and performing homograph checks. It distinguishes itself from a bare tautology, though it does not explicitly contrast with sibling tools like homoglyph or unicode_lookup.

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 use this tool versus related alternatives such as homoglyph or unicode_lookup. The word 'offline' hints at one context, but no when-to-use or when-not-to-use conditions are given.

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