Lessons from building a local macOS MCP server for ChatGPT-assisted coding and admin work
bulutarkan · reddit · 2026-09-09
The author of Mac MCP shares lessons from building a local macOS MCP server (81 tools, MIT) that lets the regular ChatGPT surface carry local tasks further — shell/files, browser automation, Accessibility control, memory, and delegated Codex/OpenCode workers.
Key takeaways: stable browser tab handles make background Safari work far less annoying; local permissions need to be obvious (localhost-only dashboard, optional auth, explicit dangerous capabilities rather than a generic 'computer use' button); delegating long sub-tasks to Codex/OpenCode works well with the main Chat thread as coordinator; and Chat/Codex/Work are distinct surfaces — the goal is making ordinary Chat more agentic for long multi-step local tasks. He's still weighing permission models: per-tool approvals vs profiles vs read-only sessions.
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