# TUI Testing with mcp-tui-driver

## Overview
[mcp-tui-driver](https://github.com/michaellee8/mcp-tui-driver) is an MCP server that provides Playwright-like automation for TUI applications. It enables Claude Code to launch, view, interact with, and test terminal UI apps through structured MCP tools.

## Installation
```bash
cargo install --git https://github.com/michaellee8/mcp-tui-driver
```
Binary installs to: `~/.cargo/bin/mcp-tui-driver`

### MCP Config
Configured globally in `~/.claude.json` under the top-level `mcpServers` key:
```json
"tui-driver": {
  "command": "/home/cal/.cargo/bin/mcp-tui-driver",
  "args": []
}
```
> **Note:** `~/.claude/.mcp.json` is NOT read by Claude Code. Global MCP servers go in `~/.claude.json`.

### Updating
```bash
cargo install --git https://github.com/michaellee8/mcp-tui-driver --force
```

## Tool Reference (23 tools)

### Session Management
| Tool | Description |
|------|-------------|
| `tui_launch` | Start a new TUI app session (command, args, cols, rows) |
| `tui_close` | Terminate a session and its process |
| `tui_list_sessions` | List all active sessions |
| `tui_get_session` | Get session details and status |
| `tui_resize` | Change terminal dimensions |

### Viewing
| Tool | Description |
|------|-------------|
| `tui_text` | Get plain text from the terminal screen |
| `tui_snapshot` | Accessibility-style snapshot with element references (like Playwright locators) |
| `tui_screenshot` | Capture terminal as PNG image |

### Keyboard Input
| Tool | Description |
|------|-------------|
| `tui_press_key` | Press a single key or key combo (e.g., `Ctrl+c`, `Enter`) |
| `tui_press_keys` | Press multiple keys sequentially |
| `tui_send_text` | Send raw text string to the terminal |

### Mouse Input
| Tool | Description |
|------|-------------|
| `tui_click` | Click a snapshot element by reference |
| `tui_click_at` | Click at specific terminal coordinates (row, col) |
| `tui_double_click` | Double-click an element |
| `tui_right_click` | Right-click an element |

### Waiting
| Tool | Description |
|------|-------------|
| `tui_wait_for_text` | Block until specific text appears on screen |
| `tui_wait_for_idle` | Block until screen stops changing |

### Scripting
| Tool | Description |
|------|-------------|
| `tui_get_code_interface` | Get TypeScript API definitions for scripting |
| `tui_run_code` | Execute JavaScript automation scripts |

### Debug
| Tool | Description |
|------|-------------|
| `tui_get_input` | Get raw input buffer with escape sequences |
| `tui_get_output` | Get raw PTY output |
| `tui_get_scrollback` | Get lines scrolled off-screen |
| `tui_send_signal` | Send signals (SIGINT, SIGTERM, etc.) |

## Typical Testing Workflow

1. **Launch** the TUI app under test:
   ```
   tui_launch → command: "python", args: ["-m", "myapp"], cols: 120, rows: 40
   ```

2. **Wait** for it to render:
   ```
   tui_wait_for_text → text: "Welcome" or tui_wait_for_idle
   ```

3. **Inspect** the screen:
   ```
   tui_snapshot → returns accessibility tree with element refs
   tui_screenshot → returns PNG for visual verification
   ```

4. **Interact** with the app:
   ```
   tui_press_key → key: "Tab" (navigate)
   tui_send_text → text: "search query" (type into fields)
   tui_press_key → key: "Enter" (confirm)
   tui_click → ref: "button-submit" (click element from snapshot)
   ```

5. **Assert** expected state:
   ```
   tui_text → verify expected text content
   tui_snapshot → verify element structure
   ```

6. **Cleanup**:
   ```
   tui_close → terminate the session
   ```

## Key Concepts

### Accessibility Snapshots
`tui_snapshot` returns a structured view of the terminal with labeled element references. These refs can be used with `tui_click`, `tui_double_click`, and `tui_right_click` — similar to Playwright's `getByRole()` locators but for terminal elements.

### Multi-Session Support
Multiple TUI sessions can run concurrently. Each `tui_launch` returns a session ID used by all other tools. This enables:
- Testing multiple instances side by side
- Launching a helper process alongside the app under test
- Comparing output between different configurations

### Asciicast Recording
Sessions record output in asciicast v3 format (.cast files) compatible with `asciinema play`. Useful for reviewing test sessions after the fact.

### JavaScript Scripting
For complex automation sequences, `tui_run_code` accepts JavaScript with access to the full TUI automation API. Use `tui_get_code_interface` to get the TypeScript definitions.

## Alternatives Considered
- **mcpterm** (https://github.com/dwrtz/mcpterm): Go-based PoC with only 2 tools (`run`, `runScreen`). Single session, no mouse support, no screenshots, no accessibility snapshots. Too minimal for systematic TUI testing.

## Dependencies
- Rust toolchain (cargo)
- Uses: wezterm-term, portable-pty, boa_engine (JS), rmcp, image