Guides for the agent era

A coding agent is a program that takes a goal, works in a real shell on a real machine, and asks you for a yes now and then. Almost everything worth knowing about running one is unglamorous: how it authenticates, where its settings live, how to keep it running after the laptop closes, how to reach it from a phone, why a tunnel says “starting” forever. The vendors’ docs cover their own product on its happy path. These guides cover the seams between products, machines, and devices — the places where a search engine is the only support desk.

Every page here follows one rule: teach the thing you searched for first, completely, using tools you already have. Where that honest route runs out — a session that must survive your absence, a machine you would rather not expose, a phone that needs a real terminal — the page says so, and only then shows what spawnd does about it. If you stop reading before that turn, you still got what you came for.

Agent guides cover Claude Code and Codex in depth — plans and pricing, settings and commands, running them remotely and in teams — plus the open alternatives, OpenCode and Aider. Device guides cover SSH from an iPhone, iPad, or Android, and every method for reaching a Mac from somewhere else. Reference pages define the vocabulary the industry is settling on. Fix pages start from the exact error you pasted into the search box. Two tools do sums and lookups a page of prose can’t. Each page links its siblings, so the rack below is a map, not a menu.