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UPinar

contrastapi

by UPinar
OverviewSchemaRelated ServersScoreDiscussions
Python
Hybrid

wayback_lookup

Read-onlyIdempotent

Retrieve historical snapshots of any domain from the Wayback Machine, showing first and last capture dates, total snapshot count, and archive URL. Instantly assess domain age and history.

Instructions

Retrieve Wayback Machine snapshots for a domain: first capture, latest, total count, snapshot list. Use to investigate domain history and age; for full audit use domain_report. Free: 30/hr, Pro: 500/hr. status='ok' means the count is authoritative (even when 0 → confirmed no archives). status='unavailable' means CDX timed out/rate-limited/5xx — total_snapshots is OMITTED (unknown, NOT zero) and the agent should NOT report "no snapshots"; the warnings[] array carries the cdx_* error code (cdx_timeout/cdx_rate_limited/cdx_unavailable/cdx_error/cdx_parse_error/cdx_body_too_large). Heavy domains (kernel.org, microsoft.com, archive.org itself) frequently time out the CDX endpoint despite having millions of snapshots — fall back to archive_url for manual inspection. Returns {domain, status, total_snapshots, first_seen, last_seen, years_online, snapshots, archive_url, summary, warnings}.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
domainYesDomain to look up in web archives (e.g. 'example.com', 'archive.org')

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Tool Definition Quality

A4.6/5.0
Behavior5/5

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

Goes beyond annotations by detailing behavior for status='ok' (authoritative even when zero) and status='unavailable' (total_snapshots omitted, warnings array with error codes). Explains heavy domain timeout issue and fallback.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Well-structured with front-loaded purpose. Each sentence adds value, though slightly lengthy. Minor room for tightening without losing information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers output format, edge cases, error handling, fallback, and rate limits. Completely addresses the tool's behavior and return structure given its complexity.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with parameter description. Description adds domain examples and context but does not substantially enhance parameter semantics beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states 'Retrieve Wayback Machine snapshots for a domain' with specific verb and resource. Distinguishes from sibling 'domain_report' by noting 'for full audit use domain_report'.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly says use for 'investigate domain history and age' and provides alternative for full audit. Includes rate limits and guidance on interpreting status codes and heavy domain fallback.

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

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