CustomerOS Flow API
34-operation REST API for outbound sequencing — flows, sequences, steps (email, LinkedIn or manual), senders with warming state and daily send limits, sending schedules, opt-out and analytics config, and per-sequence contacts. Server is templated as https://api.customeros.ai/flow/{version} with version defaulting to v1. The spec is advertised in the docs llms.txt as flowApiSpec.yaml but every HTTP path for it 404s; it was harvested from the documentation MCP server's virtual filesystem, which is the only surface that serves it.