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

With no annotations, the description carries the full behavioral burden, and it delivers richly: it explains longest-prefix-first registry resolution, sub-block handling (MA-M/MA-S/IAB), the exact returned fields, null vendor behavior for randomized addresses, cidRegistrant addition, and the source registry file. It even gives a concrete example, DA:A1:19 as Google's Company ID.

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 dense but every sentence earns its place: purpose, resolution algorithm, return fields, randomized-address edge case, and next-step sibling guidance. It is front-loaded with the core purpose and maintains a clear logical structure without redundancy.

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 single-parameter lookup tool with no output schema and no annotations, the description is remarkably complete: it explains behavior, outputs, edge cases, and related-tool routing. An agent has enough information to invoke the tool correctly and interpret its results.

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 input schema already provides 100% coverage for the single mac parameter, including format guidance and an example. The tool description does not add parameter-level semantics beyond what the schema states, so the baseline score of 3 is appropriate.

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 verb and resource: identify the organization behind a MAC address and detect randomized/private addresses. It also distinguishes itself from sibling tools by covering lookups, not compliance checks, router defaults, or corrections, and even points to get_router_defaults for 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 conveys clear usage context: it is for MAC/OUI vendor identification and randomized-address detection. It explicitly routes the user to get_router_defaults when the need is a router factory login, which serves as an alternative-usage signal, though it does not explicitly contrast with check_router_compliance or submit_correction.

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