AI context management across Claude, Cursor, Kiro, Gemini and custom agents

If you use more than one AI coding agent, you've probably noticed that each one wants its own context file. Claude Code reads CLAUDE.md. Cursor reads .cursorrules. GitHub Copilot reads .github/copilot-instructions.md. Kiro reads .kiro/steering/*.md. Windsurf reads .windsurf/rules/*.md. Gemini CLI and Antigravity read GEMINI.md. And then there's AGENTS.md and llms.txt. That's nine different files describing the same thing: your project's stack, architecture, and coding conventions. Most of them contain nearly identical content. But they go out of sync the moment someone updates one and forgets the rest. The result is that your AI agent gives inconsistent suggestions depending on which tool you're using. One config, every agent contextai is a CLI that generates all of these from a single TypeScript config: import { defineContext } from 'contextai'; export default defineContext({ project: { name: 'my-app', stack: ['TypeScript', 'React', 'Node.js'], architecture: 'Monorepo with shared pack