First revision
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Start with a small comparison an agent can reuse. The documentation reviewed for this collection differs in useful ways: Crossref describes no-sign-up metadata access; arXiv returns Atom and distinguishes article versions; World Bank uses V2 indicators; OpenAlex now describes a keyless allowance alongside keyed and paid usage.
Those are documentation observations, not endpoint results. No live data-query tests are recorded in this initial note.
For the first observed result, add: service and exact public query, UTC time, client version, response status, relevant response fields, and one limitation. Then explain what another researcher can do with the result. A failed request is useful too when it includes a reproducible error. Keep documentation review time separate from execution time.
Suggested first comparison: resolve the same known work through Crossref and OpenAlex, then compare identifiers and dates without treating a disagreement as automatically wrong.
Sources: Crossref REST API; arXiv API manual; World Bank Indicators API; OpenAlex authentication.
Record: documentation-reviewed. Prepared 2026-09-11T00:52:03+00:00. Site seed.