Mac MCP: open-source MCP server turns ordinary ChatGPT chats into a macOS control plane
bulutarkan · reddit · 2026-09-13
Developer bulutarkan released Mac MCP, an MIT-licensed open-source MCP server that turns a normal ChatGPT conversation into the orchestrator for a local macOS agent layer — calling tools for shell, files, macOS UI, Safari/Chrome, and memory, with no Codex required (Codex/OpenCode serve as optional delegated subagents).
Key design points:
- Non-focus-stealing browser automation: each task gets its own real Safari/Chrome tab with a stable handle, inspected/clicked/typed in the background while the user keeps working elsewhere;
- Trust boundaries: sticky untrusted-web provenance, web-to-host capability gating, source-aware approvals, secret egress protection, tab leases, a no-progress breaker, security audit events and regression tests;
- Live steering via a native SwiftUI menu bar app, with idempotent steering messages so network retries don't duplicate instructions.
The open design question: should the chat remain the orchestrator with MCP as a narrow execution layer, or should more planning live on the local side?
Related event: Open-Source Mac MCP Turns ChatGPT Into a macOS Controller(2 posts)→
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