Oct 15 release expands Mercury MCP from read to write: ChatGPT/Claude/Cursor can request sends/transfers and categorize expenses, but money only moves after Mercury-app approval.
Kondo’s WhatsApp MCP (Streamable HTTP at mcp.trykondo.com/mcp) lets Claude, ChatGPT, Cursor, Claude Code and Copilot search chats, read messages, draft replies, label, reminder and archive while Kondo Desktop holds the local WhatsApp session—no send tool, so nothing leaves as a message until you press Send. Relay keeps chat content off the cloud; Desktop must stay open. MCP on Business/Enterprise plans; install skill at trykondo.com/skills/kondo-whatsapp.md.
Marc Lou’s MailCheap exposes Streamable HTTP MCP at https://mailcheap.ai/mcp so ChatGPT, Claude and Grok Bot connect with OAuth (no key to copy); Claude Code, Codex and Cursor use a bearer API key. Agents can draft campaigns, send tests, schedule issues and read stats; schedule/send tools are marked destructive and ask before sending. Open-source / self-host option; pay only for SES-style sends vs beehiiv-class plans.
Open-source TypeScript beta for agentic apps: define a capability once and expose it to UI, agent, HTTP, CLI, MCP, and A2A so Claude/ChatGPT/Cursor can call the same actions humans click—skip screen-scraping computer-use for lower tokens.
Local-first OSS DB/workspace where Claude Code/Codex/Cursor share durable records, docs, skills, and apps—writes that matter go through human review; Skill, MCP, OpenAPI, and ACP connections keep agents stateless and work durable.