lookup_phone

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

No annotations are provided, so the description carries the full burden. It clearly identifies the operation as a lookup and discloses the output fields (community verdict, rating, spam level, operator, region, tags, recent reviews). There is no mention of rate limits, auth, or edge cases, but for a straightforward read-only lookup, the provided detail is adequate.

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 sentence that starts with the main action 'Look up' and efficiently packs all essential information—website, output categories—without redundancy or filler.

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?

The tool is simple: one parameter with full schema coverage, no output schema required, and no complex behavior. The description fully covers what the tool does and what it returns, making it complete for an agent to select and invoke it correctly.

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 description coverage is 100% for the 'number' parameter, so the baseline is 3. The description does not add parameter-specific details beyond the schema, but none are needed given the schema already explains the format and meaning.

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 uses a specific verb 'Look up' with a clear resource 'phone number on ktozvonil.net' and enumerates the returned data (community verdict, rating, spam level, operator, region, tags, recent reviews). This clearly distinguishes it from the sibling tool 'post_comment', which serves a different purpose.

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?

The description implies when to use the tool: whenever you need phone number information from ktozvonil.net. The only sibling tool, 'post_comment', has an obviously distinct purpose, so the usage context is clear even though no explicit exclusions or alternative recommendations are stated.

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