https://flow.engineer/blog Posts and guides on AI agents, iMessage and messaging APIs, MCP and the Personal Agent Protocol. en-us Fri, 23 Oct 2026 12:00:00 GMT https://flow.engineer/blog/send-imessage-programmatically https://flow.engineer/blog/send-imessage-programmatically Fri, 23 Oct 2026 12:00:00 GMT iMessage API curl, TypeScript and Python: get a key, receive a signed webhook, reply once and handle retries. https://flow.engineer/blog/imessage-api-without-mac https://flow.engineer/blog/imessage-api-without-mac Fri, 23 Oct 2026 12:00:00 GMT iMessage API Why a hosted iMessage API removes the Mac, what the DIY relay costs you, and how to choose. https://flow.engineer/blog/imessage-mcp-server https://flow.engineer/blog/imessage-mcp-server Fri, 23 Oct 2026 12:00:00 GMT iMessage API Two things people mean by it: a messaging MCP for your coding agent, and your product as an MCP server. https://flow.engineer/blog/does-twilio-support-imessage https://flow.engineer/blog/does-twilio-support-imessage Fri, 23 Oct 2026 12:00:00 GMT iMessage API No. Flow gives your agent iMessage, and you can keep Twilio for SMS beside it. https://flow.engineer/blog/imessage-api-pricing https://flow.engineer/blog/imessage-api-pricing Fri, 23 Oct 2026 12:00:00 GMT iMessage API Why Flow is the value pick: start free, support 200–300 people for $30 a month, and scale with dedicated lines from $100. https://flow.engineer/blog/best-imessage-api https://flow.engineer/blog/best-imessage-api Fri, 23 Oct 2026 12:00:00 GMT iMessage API Why Flow is the best iMessage API for agents: one codebase, reliable webhooks, testing and every channel in one platform. https://flow.engineer/blog/apple-messages-for-business-vs-imessage-api https://flow.engineer/blog/apple-messages-for-business-vs-imessage-api Fri, 23 Oct 2026 12:00:00 GMT iMessage API Two different things that both get called iMessage for business, side by side. https://flow.engineer/blog/linq-alternative https://flow.engineer/blog/linq-alternative Fri, 23 Oct 2026 12:00:00 GMT iMessage API Why Flow is the best Linq alternative: a lower paid price, a free start and one agent on every channel. https://flow.engineer/blog/build-imessage-ai-agent https://flow.engineer/blog/build-imessage-ai-agent Fri, 23 Oct 2026 12:00:00 GMT iMessage API Webhook in, model call, tools, reply out: the Flow loop, memory, testing and production safeguards. https://flow.engineer/blog/imessage-ai-agent-vercel-ai-sdk https://flow.engineer/blog/imessage-ai-agent-vercel-ai-sdk Fri, 23 Oct 2026 12:00:00 GMT iMessage API Take a Vercel AI SDK agent and answer on iMessage with streamed, chat-sized bubbles. https://flow.engineer/blog/imessage-ai-agent-openai-agents-sdk https://flow.engineer/blog/imessage-ai-agent-openai-agents-sdk Fri, 23 Oct 2026 12:00:00 GMT iMessage API Receive an iMessage, run an OpenAI Agents SDK agent and send the result back as bubbles. https://flow.engineer/blog/imessage-ai-agent-claude-agent-sdk https://flow.engineer/blog/imessage-ai-agent-claude-agent-sdk Fri, 23 Oct 2026 12:00:00 GMT iMessage API Run a Claude agent for each iMessage and deliver its streamed answer. https://flow.engineer/blog/langchain-imessage-agent https://flow.engineer/blog/langchain-imessage-agent Fri, 23 Oct 2026 12:00:00 GMT iMessage API Connect a LangChain model or chain to an iMessage conversation. https://flow.engineer/blog/imessage-api-for-coding-agents https://flow.engineer/blog/imessage-api-for-coding-agents Fri, 23 Oct 2026 12:00:00 GMT iMessage API Let Claude Code, Cursor or Codex set up and test a messaging integration for you. https://flow.engineer/blog/imessage-whatsapp-telegram-one-agent https://flow.engineer/blog/imessage-whatsapp-telegram-one-agent Fri, 23 Oct 2026 12:00:00 GMT iMessage API What changes per channel and what stays the same when one codebase answers everywhere. https://flow.engineer/blog/imessage-api-nodejs https://flow.engineer/blog/imessage-api-nodejs Fri, 23 Oct 2026 12:00:00 GMT iMessage API Install the SDK, stream inbound messages, verify signed webhooks in Express and reply safely. https://flow.engineer/blog/imessage-api-python https://flow.engineer/blog/imessage-api-python Fri, 23 Oct 2026 12:00:00 GMT iMessage API Stream inbound events, verify signed webhooks in FastAPI and reply with idempotency keys. https://flow.engineer/blog/imessage-api-go https://flow.engineer/blog/imessage-api-go Fri, 23 Oct 2026 12:00:00 GMT iMessage API Poll events, reply and verify signed webhooks with the standard library, no SDK needed. https://flow.engineer/blog/imessage-webhooks-signing-retries https://flow.engineer/blog/imessage-webhooks-signing-retries Fri, 23 Oct 2026 12:00:00 GMT iMessage API What a reliable webhook does, and how Flow, Sendblue and Linq differ on retries and replay. https://flow.engineer/blog/imessage-tapbacks-typing-effects-api https://flow.engineer/blog/imessage-tapbacks-typing-effects-api Fri, 23 Oct 2026 12:00:00 GMT iMessage API Tapbacks, typing indicators, read receipts, effects, edit and unsend, with the limits that apply. https://flow.engineer/blog/free-imessage-api https://flow.engineer/blog/free-imessage-api Fri, 23 Oct 2026 12:00:00 GMT iMessage API Start free on Flow's shared iMessage line, test your agent without a phone, and scale to 200–300 people for $30 a month. https://flow.engineer/blog/sendblue-alternative https://flow.engineer/blog/sendblue-alternative Fri, 23 Oct 2026 12:00:00 GMT iMessage API Start with Flow for free, scale from $30 a month, and run one agent across every channel. https://flow.engineer/blog/imessage-vs-sms-vs-rcs-for-ai-agents https://flow.engineer/blog/imessage-vs-sms-vs-rcs-for-ai-agents Fri, 23 Oct 2026 12:00:00 GMT iMessage API The rules that differ for agents: who writes first, registration, consent and what each can show. https://flow.engineer/blog/imessage-vs-whatsapp-for-ai-agents https://flow.engineer/blog/imessage-vs-whatsapp-for-ai-agents Fri, 23 Oct 2026 12:00:00 GMT iMessage API Reply windows, templates, buttons, limits and setup compared, and how to build one agent for both. https://flow.engineer/blog/test-imessage-agent-without-a-phone https://flow.engineer/blog/test-imessage-agent-without-a-phone Fri, 23 Oct 2026 12:00:00 GMT iMessage API Simulated contacts, transcripts and graded test chats that keep the real channel rules. https://flow.engineer/blog/imessage-ai-agent-mastra https://flow.engineer/blog/imessage-ai-agent-mastra Fri, 23 Oct 2026 12:00:00 GMT iMessage API Stream a Mastra agent’s answer as chat bubbles and keep memory per person. https://flow.engineer/blog/flow-imessage-features-and-pricing https://flow.engineer/blog/flow-imessage-features-and-pricing Fri, 23 Oct 2026 12:00:00 GMT iMessage API What an agent on Flow's iMessage line can do, what each plan costs, and the limits and restrictions that apply. https://flow.engineer/blog/imessage-api-rate-limits https://flow.engineer/blog/imessage-api-rate-limits Fri, 23 Oct 2026 12:00:00 GMT iMessage API Flow reply windows, new-contact budgets, pacing and abuse protection, with design patterns for agents. https://flow.engineer/blog/imessage-opt-in-link https://flow.engineer/blog/imessage-opt-in-link Fri, 23 Oct 2026 12:00:00 GMT iMessage API How to get customers to text your iMessage line first: opt-in links, QR codes and where to put them. https://flow.engineer/blog/imessage-media-and-voice-notes-api https://flow.engineer/blog/imessage-media-and-voice-notes-api Fri, 23 Oct 2026 12:00:00 GMT iMessage API Images, video, documents and voice notes: types, size limits, uploads and malware scanning. https://flow.engineer/blog/imessage-api-security-checklist https://flow.engineer/blog/imessage-api-security-checklist Fri, 23 Oct 2026 12:00:00 GMT iMessage API Keys, webhooks, retention, deletion and agent tools: what to lock down before you ship. https://flow.engineer/blog/idempotency-keys-messaging-api https://flow.engineer/blog/idempotency-keys-messaging-api Fri, 23 Oct 2026 12:00:00 GMT iMessage API How to retry a send without messaging twice, with the rules, the traps and the one case a key cannot cover. https://flow.engineer/blog/imessage-group-chats-api https://flow.engineer/blog/imessage-group-chats-api Fri, 23 Oct 2026 12:00:00 GMT iMessage API Which providers support group messaging, on which plans, and what to design around. https://flow.engineer/blog/imessage-api-glossary https://flow.engineer/blog/imessage-api-glossary Fri, 23 Oct 2026 12:00:00 GMT iMessage API The terms you meet building on iMessage: tapback, A2P 10DLC, MSP, idempotency key, send gate and more. https://flow.engineer/blog/flow-vs-sendblue https://flow.engineer/blog/flow-vs-sendblue Fri, 23 Oct 2026 12:00:00 GMT iMessage API Why Flow is the better iMessage platform for agents: a free start, one agent on every channel and webhooks that do not lose messages. https://flow.engineer/blog/flow-vs-linq https://flow.engineer/blog/flow-vs-linq Fri, 23 Oct 2026 12:00:00 GMT iMessage API Why Flow is the better iMessage platform for agents: a free line, a $30 shared line for roughly 200–300 people, dedicated lines from $100 and one codebase across channels. https://flow.engineer/blog/flow-vs-twilio https://flow.engineer/blog/flow-vs-twilio Fri, 23 Oct 2026 12:00:00 GMT iMessage API Why Flow is the way to put an agent on iMessage, while Twilio does not list iMessage as a channel. https://flow.engineer/blog/flow-vs-photon https://flow.engineer/blog/flow-vs-photon Fri, 23 Oct 2026 12:00:00 GMT iMessage API Why Flow is the better-value iMessage platform for AI agents: start free for more people, reach roughly 200 to 300 people for $30 a month and get dedicated lines from $100. https://flow.engineer/blog/sentry-ai-agent-ready https://flow.engineer/blog/sentry-ai-agent-ready Wed, 14 Oct 2026 12:00:00 GMT Personal notes MCP, CLI, skills, plugins, code review and a Slack agent. What Sentry is building, how it works, and who is working on it. https://flow.engineer/blog/poppy-personal-agent-protocol-launch https://flow.engineer/blog/poppy-personal-agent-protocol-launch Sat, 10 Oct 2026 12:00:00 GMT News What launched, why it matters for any company with customers who use AI agents, and the three things to do first. https://flow.engineer/blog/poppy-what-is-personal-agent-protocol https://flow.engineer/blog/poppy-what-is-personal-agent-protocol Sat, 10 Oct 2026 12:00:00 GMT Explainer How personal agents find a company, sign a person in and get work done, in plain words.