# Mellos Mapping (MCP server)

> Mellos Mapping is an MCP server that adds developer tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Live layered dependency map for bottom-up development, drawn by the agent in a terminal pane. It has 100 GitHub stars, is released under the MIT license and runs locally with npx -y mellos-mapping.

A live, terminal-native map of bottom-up development for Claude Code, ChatGPT desktop Codex mode and Codex CLI. While Claude builds your system, a split pane beside the conversation shows the system's layered dependency map: primitive layers at the bottom, dependency edges that may only point downward, ghost nodes for what is designed, a spinner on what is being built right now, and solid green for what is built and verified.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/GuangminJu/mellos-mapping |
| GitHub stars | 100 |
| License | MIT |
| Language | TypeScript |
| Transport | stdio |
| Packages | npm: mellos-mapping |
| Remote URL | none |
| Needs API key | no |
| Official | no |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code |
| Category | Developer tools |
| Latest release | v0.27.1 (Sep 22, 2026) |
| Last commit | Sep 22, 2026 |
| MCP registry name | io.github.GuangminJu/mellos-mapping |

## Install

### Claude Desktop (claude_desktop_config.json)

```json
{
  "mcpServers": {
    "mellos-mapping": {
      "command": "npx",
      "args": [
        "-y",
        "mellos-mapping"
      ]
    }
  }
}
```

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

### Claude Code

```sh
claude mcp add --transport stdio mellos-mapping -- npx -y mellos-mapping
```

### Cursor (.cursor/mcp.json)

```json
{
  "mcpServers": {
    "mellos-mapping": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mellos-mapping"
      ]
    }
  }
}
```

Project file; use ~/.cursor/mcp.json to enable it in every project.

### VS Code (.vscode/mcp.json)

```json
{
  "servers": {
    "mellos-mapping": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mellos-mapping"
      ]
    }
  }
}
```

Config formats checked against the official docs on 2026-10-07.

## Tools

- `mmap_declare`: Grow the map: title (null removes it), diagram kind, layer bands, lanes, groups (subsystems), nodes — with status,…
- `mmap_update`: Record progress and revise: status (planned → in-progress → done +evidence, regressed), relabel a node, move it to…
- `mmap_remove`: Revise: drop edges, nodes, groups, lanes, empty bands — and, with pages, whole pages, file and all (permanent; applied…
- `mmap_view`: Render the current map as text inline (optional zoom, -4…2), ending with a pages: line naming every page the project…
- `mmap_read`: Structured page discovery, precise IDs, filtered/paginated reads, context and source changes
- `mmap_batch`: One-page mixed create/update/remove transaction with a revision check
- `mmap_setup`: Get/set the project's mapping policy — when maps open
- `mmap_open`: Put the map on your screen: open the pane, or retarget an open one to a page (window: true for the dedicated window).
- `always`: map every structured task: workflows, designs, architecture,
- `complex`: the same, but only for medium or complex tasks: several modules,
- `on-request`: map only when you explicitly ask. In a project with no map,

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