x402_wayback

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does usefully mention the source (archive.org) and the per-call cost ($0.01 USDC/call), but it never states what the returned 'snapshot' contains, whether it returns page content or metadata, or what happens when no snapshot exists.

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 that conveys the tool's purpose, source, and cost with no filler. It is easy to parse and front-loaded.

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?

With no output schema and no annotations, the description should clarify what the tool returns and any operational caveats. It does not explain the return format, how 'closest' is determined, or behavior on missing snapshots, so the definition is not fully self-sufficient.

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 documents the single 'url' parameter with 100% coverage, so the baseline is 3. The description adds mild context by indicating the URL is the one to look up in archive.org, but it does not enrich the parameter with format or example guidance beyond the schema.

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 clearly identifies the resource ('a URL from archive.org') and the specific function ('closest archived snapshot'), which distinguishes it from sibling tools like x402_read or x402_metadata. It lacks an explicit verb like 'retrieve' or 'fetch', but the meaning is unambiguous.

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 about when to use this tool versus alternatives, such as preferring it for historical/archived content or when a live URL is unavailable. With 35 sibling tools, the absence of any routing context is a notable gap.

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