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

With no annotations, the description carries the full behavioral burden. It usefully discloses that validation is offline and covers format, version and checksum, but it does not say what an invalid address produces (false vs. error vs. detail object), which is the key behavioral fact for a validation tool.

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 front-loaded sentence with no filler; every clause contributes (what is validated, which checks, and the offline behavior).

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 simple one-parameter validation tool with no output schema and no annotations, the description is adequate on inputs and scope but leaves the return semantics unspecified. An agent cannot tell from the description alone whether to expect a boolean, a structured result, or an exception on invalid input.

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 0%, but the description compensates by defining the single parameter as a Tor v3 address, which gives meaningful semantics beyond the bare 'string' type in the schema. It could still specify expected structure (e.g., 56-character base32 .onion), but the core meaning is conveyed.

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 states a specific verb ('Validate') and resource ('Tor v3 address') and enumerates exactly what is checked: format, version and checksum. There is no ambiguity with the unrelated sibling tools.

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?

Use is only implied by the word 'Validate'; there is no explicit statement of when to call it (e.g., before connecting or submitting an address) or what it does not verify (e.g., reachability). The 'without a network request' clause hints at scope but is not framed as a usage condition.

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