Start with the quickstart. The API reference is the contract; if something is documented here and doesn't work, that's a bug and we want to hear about it.
No client libraries. REST and a bearer token, which means whatever HTTP client you already have. If we ship libraries we'll say so here first.
Rate limits are generous and unpublished. They exist to stop a runaway, not to shape normal use. We'll publish exact numbers alongside the response headers when those ship. A documented limit with no header to read against it is worse than no limit at all.
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Public utilities we built for ourselves and shipped because everyone needs them.