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

With no annotations, the description carries the full burden. It does disclose the x402 pricing model ($0.02/call in USDC on eip155:8453) and what the response contains, which are genuinely useful. It omits auth requirements, rate limits, and failure behavior for invalid or unarchived URLs.

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?

Front-loads purpose well, but the closing sentence 'Use this when an agent needs to how the Internet Archive remembers a URL' is grammatically broken and largely restates the opening. The pricing tail is useful but tacked on.

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?

There is no output schema, so the description's enumeration of returned fields (first archive, latest snapshot, year span, recent captures) usefully fills that gap. For a single-parameter read tool this is nearly complete, only missing error/empty-result behavior.

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 coverage is 100% for the single url parameter, so the schema already documents it as 'URL or domain'. The description adds only the vague phrase 'for any URL', roughly matching the schema but adding no format, scheme, or normalization guidance.

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?

States a specific verb (Query) and resource (Internet Archive's Wayback index) and enumerates the return payload: first archive date, latest snapshot, year span, recent captures. It does not distinguish itself from plausible siblings like dev_page_verify or live_url_metadata, which query related web-state data.

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?

Gives use-case context (fact-checking page history, deleted content, due diligence), which implies when the tool helps. However, it names no alternative tool and no when-not condition, so an agent must infer selection from sibling names alone.

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