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

With no annotations, the description usefully discloses that the tool returns multiple snapshot captures and direct archive links, which goes beyond a bare noun phrase. It does not mention rate limits, availability behavior when no snapshots exist, or authentication needs, leaving meaningful behavioral gaps for an unannotated 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?

Two sentences, front-loaded with the resource and returned data, followed by concrete use cases. There is no filler or 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?

The presence of an output schema reduces the need to explain return values, and the description does indicate the snapshot set returned. Still, for a two-parameter tool with 0% schema description coverage, it omits input format guidance and does not clarify failure behavior when no captures exist.

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%, so the description must compensate. It implies that 'date' selects the closest capture, which adds some meaning, but it does not explain the expected date format, URL format, or what happens when 'date' is omitted despite the schema default.

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 exact resource—Internet Archive Wayback Machine snapshots of a URL—and specifies the returned captures: closest to a date, first, latest, and direct archive links. This is far more specific than the tool name or title alone and clearly separates it from siblings like read_web_page or url_metadata.

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?

It gives clear use cases: see how a page looked before or recover deleted content. However, it does not state when not to use it or name alternatives such as read_web_page for current content, so it falls short of explicit sibling routing.

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