kata

One tool to configure all your AI harnesses / agents. Define it once, perform it everywhere!

kata - English /ˈkɑːtə/, Japanese 型 [ka̠ta̠] - a mold, model, or pattern: a standardized template that produces the same form every time.

Every AI coding tool wants its own config: CLAUDE.md, AGENTS.md, .cursor/rules, .mcp.json, .codex/config.toml, and more. Keeping them in sync by hand is tedious and error-prone.

kata lets you write instructions, MCP servers, prompts, skills, and subagents once in a .kata/ directory, then compiles them into each tool's native format - like Babel or Terraform, but for agent configs.

• Guide - what kata is and how to get started
• Kata format - everything .kata/ supports
• CLI reference - every command and flag
• ROADMAP.md - planned work

How it works

1. kata init scaffolds .kata/ and detects which tools are installed.
2. You describe your customization once, in .kata/.
3. kata plan shows exactly which native files would be created or updated, with diffs.
4. kata apply writes them.

Output is deterministic and idempotent: the same .kata/ always produces byte-identical native files, so a second plan reports no changes and git diffs stay clean. Content you hand-edit outside the <!-- kata:begin/end --> managed regions is never touched, and JSON configs are merged rather than overwritten.

Quick start

Install the CLI (requires Node ≥ 24):

npm install -g @katahq/cli

Or run it without installing: npx @katahq/cli <command>.

Then, in a project you want to configure:

kata init                       # scaffold .kata/, detect installed tools
$EDITOR .kata/instructions/base.md
kata plan                       # preview native files, with diffs
kata apply                      # write them

Or configure every project at once via the user-level ~/.kata/:

kata init --global
$EDITOR ~/.kata/instructions/base.md
kata apply --global             # emits ~/.claude/CLAUDE.md, ~/.codex/config.toml, ...

Commands

Every command except import also accepts -g, --global to operate on the user-level ~/.kata/. Secrets are referenced as ${env:VAR} in .kata/ and rendered to each tool's native expansion syntax - never inlined into a committed file.

Targets

Adapters for Claude Code, Codex CLI, GitHub Copilot CLI, Cursor, Gemini CLI, OpenCode, and VS Code. Each declares its capabilities and reports lossy mappings in plan/apply output rather than dropping them silently. See the adapter reference for the full capability matrix. Community adapters can ship as kata-adapter-* npm packages.

Repository layout

• packages/core - kata schema (zod), project loader, planner/applier, adapter interface, managed-region + JSON-merge write strategies.
• packages/cli - the kata command-line tool (built on oclif).
• packages/adapters/* - one adapter per target tool.
• packages/docs - VitePress documentation site.

Development

npm run build        # build all workspaces
npm run typecheck
npm run lint
npm test             # vitest
npm run docs:build   # build the docs site

Requires Node ≥ 24 (pinned in .node-version); uses npm workspaces.

License

MIT © Tiago Santos