basecamp-cli-mcp

A Model Context Protocol (MCP) server that wraps the basecamp CLI. Every non-shortcut CLI action (projects list, todos create, cards update, etc.) is exposed as an MCP tool, so MCP-compatible clients (Claude Code, Claude Desktop, etc.) can drive Basecamp directly.

Requirements

• Python ≥ 3.11
• The basecamp CLI on PATH, already authenticated (basecamp setup) — see First-time setup below to do both in one command
• uv for the recommended install

First-time setup

If you don't have the basecamp CLI installed yet:

uvx basecamp-cli-mcp setup

This checks for the basecamp binary, runs the official installer (curl -fsSL https://basecamp.com/install-cli | bash) after a y/N prompt if it's missing, then runs basecamp setup to walk you through OAuth.

On macOS, after auth completes it offers to:

1. Add basecamp to your claude_desktop_config.json (with a timestamped backup of any existing file). You'll choose between:

• Minimal — todos, cards, card tables, card steps (plus projects_list). A focused tool set that's easier for agents to navigate.
• Full — all 250+ tools.
• Skip — leave the config alone.

1. Restart Claude Desktop.

macOS and Linux only for the install/auth — on Windows the command prints the PowerShell installer and exits. The Claude Desktop step is macOS-only.

Run

The fastest way — no install step at all:

uvx basecamp-cli-mcp

uvx resolves the package, runs it in an ephemeral isolated env, and exec's it on stdin/stdout.

To install permanently:

uv tool install basecamp-cli-mcp
basecamp-cli-mcp

Add to Claude Code

claude mcp add basecamp -- uvx basecamp-cli-mcp

Add to Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "basecamp": {
      "command": "uvx",
      "args": ["basecamp-cli-mcp"]
    }
  }
}

If uvx isn't on Desktop's PATH (it strips most of your shell PATH), use the absolute path — which uvx from your shell.

Filtering tools

By default the server exposes all 250+ tools. Most agents only need a handful, and a smaller catalog speeds up tool selection. Filter with --include / --exclude (fnmatch globs against tool names; both flags repeatable):

basecamp-cli-mcp --include 'cards_*' --include 'todos_*'
basecamp-cli-mcp --include '*' --exclude 'webhooks_*' --exclude 'templates_*'

Register multiple profiles in claude_desktop_config.json and turn them on per task:

{
  "mcpServers": {
    "basecamp-cards": {
      "command": "uvx",
      "args": ["basecamp-cli-mcp", "--include", "cards_*", "--include", "projects_list"]
    },
    "basecamp-todos": {
      "command": "uvx",
      "args": ["basecamp-cli-mcp", "--include", "todos_*", "--include", "projects_list"]
    },
    "basecamp-full": {
      "command": "uvx",
      "args": ["basecamp-cli-mcp"]
    }
  }
}

BASECAMP_BIN

If the basecamp CLI isn't on the spawned process's PATH (a real risk under Claude Desktop), set:

"env": { "BASECAMP_BIN": "/absolute/path/to/basecamp" }

How it works

Tool schemas are pre-generated and committed to src/basecamp_cli_mcp/data/tools.json (shipped inside the wheel as package data). At runtime the server loads that file and registers one MCP tool per entry. Each tool:

1. Builds argv from positional arguments and flags defined in the schema.
2. Shells out: basecamp <group> <action> <args...> --json.
3. Returns the parsed data field from the CLI's {ok, data} envelope to the MCP client.

Shortcut commands (todo, done, card, comment, etc.) are intentionally excluded — their underlying actions (todos_create, cards_create, …) are already exposed.

Regenerating tool schemas

After upgrading the basecamp CLI:

uv run basecamp-cli-mcp generate

Review the diff in src/basecamp_cli_mcp/data/tools.json and commit. The generator reads basecamp commands --json and parses basecamp <group> <action> --help for each action.

Development

uv sync
uv run pytest
uv build                       # wheel + sdist into dist/

Layout:

• src/basecamp_cli_mcp/server.py — wires up the MCP server from data/tools.json
• src/basecamp_cli_mcp/runner.py — builds argv and shells out
• src/basecamp_cli_mcp/generator.py — regenerates data/tools.json
• src/basecamp_cli_mcp/help_parser.py — parses --help text into a schema
• src/basecamp_cli_mcp/cli.py — entrypoint (basecamp-cli-mcp)
• src/basecamp_cli_mcp/data/tools.json — generated tool schemas (committed)