Gmail API
Official Google API to read, label, draft, send emails programmatically. Auth via OAuth. Lets you build agents that triage your inbox overnight, draft replies, and wake you up with a clean feed.
Strengths
- Full access: read, write, draft, label, archive, delete
- Free for personal use (generous quota)
- Stable and documented, no surprise breaking changes
Limitations
- OAuth setup tedious (Google Cloud + credentials + consent screen)
- Aggressive rate limits on some endpoints (200 quota units/sec)
Best for
- Overnight inbox triage agent
- Newsletter aggregator that digests your mail day