# Hosts: Cursor, Claude Code, Copilot, Antigravity

Lifecycle rules live in `AGENTS.md`. `wk init` and `wk export-rules` write a thin pointer for each host. `wk mcp` writes MCP config in the file that host actually reads. `wk model resolve --host …` maps the same capability class to that host’s model slug.

Windsurf still gets a rules pointer (`.windsurfrules`). It does not get a first-class MCP writer yet.

## What each host gets

| Surface | Cursor | Claude Code | GitHub Copilot / VS Code | Antigravity / Gemini CLI |
|---------|--------|-------------|--------------------------|---------------------------|
| Rules | `.cursorrules` | `CLAUDE.md` | `.github/copilot-instructions.md` | `GEMINI.md` |
| Project MCP | `.cursor/mcp.json` | `.mcp.json` | `.vscode/mcp.json` (`servers`) and shared `.mcp.json` | `.agents/mcp_config.json` |
| User MCP | `~/.cursor/mcp.json` | `~/.claude.json` (`mcpServers`) | `~/.copilot/mcp-config.json` | `~/.gemini/config/mcp_config.json` |
| Model overlay | `models/hosts/cursor.yaml` | `models/hosts/claude.yaml` | `models/hosts/copilot.yaml` | `models/hosts/antigravity.yaml` |
| External skills (`wk sync`) | `~/.cursor/skills` | symlink `~/.claude/skills` | not mirrored (use repo `.mcp.json`) | symlink `~/.gemini/skills` |

Canonical content is still `AGENTS.md`, `skills/`, and `mcps/`. Host files are adapters.

```bash
wk init . --mcp default --hook
wk align .
wk mcp default --install
wk mcp default --install --host claude
wk mcp default --project
wk model resolve --skill agent-tdd --spec-complete --host claude
wk model resolve --skill agent-tdd --spec-complete --host copilot
wk model resolve --skill agent-tdd --spec-complete --host antigravity
```

`--host` accepts `cursor`, `claude`, `copilot`, `antigravity` (aliases: `gemini`, `agy`), a comma list, or `all` (default).

## What is still host-shaped

Cursor’s in-product skill picker and Task `model` slugs are the deepest. Claude Code and Antigravity pick up Agent Skills from their user skill dirs after `wk sync`. Copilot Chat reads `.vscode/mcp.json`; Copilot’s Agent Host also reads workspace `.mcp.json`.

Kit-authored `skills/agent-*` stay in the Waykit clone (`~/.agents/skills`). Hosts that do not walk that tree still need the handshake: read `~/.agents/AGENTS.md`, then load the skill file.

OAuth popups differ (Cursor vs Claude vs VS Code). Stdio servers that need env vars still need those vars in the process that launches the host.

## EDD vs hosts

The eval runner is `wk`, not the IDE chat. `--style cli --cli cursor-agent|claude|agy` can drive a live host binary. That path is part of [EDD (alpha)](./edd.md), not a complete eval platform.