Token isolation is the easy half of multi-tenant OAuth

Multi-tenant OAuth security depends less on token storage isolation, now a well-established practice through per-tenant encryption boundaries and envelope encryption, than on managing the ongoing and provider-specific credential lifecycle. Refresh-token rotation can turn concurrency bugs, failed persistence, or duplicate refresh requests into revoked grants and forced user reauthorization, making distributed locking, durable writes, monitoring, and provider-specific retry rules essential. Providers vary widely in expiration reporting, token reuse windows, error formats, inactivity policies, and revocation behavior, so reliable systems require per-provider configuration, authenticated health probes, and clear distinctions between temporary failures and credentials requiring reconnection. Encryption-key rotation should be separate from provider token rotation and designed to rewrap keys without disrupting user access, while caches must also be encrypted and protected from concurrent updates. Because revocations often occur outside an application's control and without webhooks, credential systems need actionable status signals and session limits, particularly when agents receive broad, long-lived access. The central build-versus-buy question is therefore not basic cryptographic isolation but whether to operate the costly infrastructure for refresh coordination, provider quirks, credential monitoring, and incident response across hundreds of integrations.

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