What can you do with doublespeed — Xcode as an API?

@doublespeed/mcp

An MCP server that gives a coding agent a Mac. Build, test, archive and run iOS apps — native, React Native, Expo — on the doublespeed Mac fleet from Linux, a container, CI, or a Mac without Xcode.

Tool names match XcodeBuildMCP (build_sim, test_sim, build_run_sim, list_sims, discover_projs, list_schemes, stop_app_sim, doctor) so prompts and skills written for a local Mac work unchanged when there is no Mac.

Install

Needs Node 20+. check_project works with no key at all; everything else needs a DS_API_KEY (free $200 of Mac time at https://mac.doublespeed.ai/dashboard → API keys).

Claude Code

claude mcp add doublespeed -e DS_API_KEY=dsx_... -- npx -y @doublespeed/mcp

Cursor / Windsurf / Codex / VS Code — add to the client's MCP config:

{ "mcpServers": { "doublespeed": { "command": "npx", "args": ["-y", "@doublespeed/mcp"], "env": { "DS_API_KEY": "dsx_..." } } } }

Tools

Tool	What it does	Where it runs
`discover_projs`	find .xcworkspace / .xcodeproj / Package.swift	local
`list_schemes`	shared schemes of a project/workspace	local
`list_sims`	simulators, runtimes and Xcode versions on the fleet	API
`check_project`	no key needed — schemes resolve, every Swift file parses, plists valid (lint, no compile)	Mac
`build_sim`	compile for the iOS Simulator; `file:line:col` errors	Mac
`test_sim`	build + XCTest / Swift Testing; per-test results	Mac
`build_run_sim`	build, install, launch; returns a browser URL to a live simulator	Mac
`stop_app_sim`	end a live session	API
`archive_app`	unsigned `.xcarchive` (Release)	Mac
`job_status`	status, diagnostics, tests, log tail of any job	API
`doctor`	key, API reachability, fleet capabilities	local + API

Only files under workspaceRoot (default: the project's directory) are uploaded, content-addressed — after the first run only changed files move. A small app's test run takes ~20–40 s of Mac time and costs a few cents; nothing is billed while queued.

Not yet

Screenshots / accessibility tree of the running simulator, code signing and TestFlight upload. The live build_run_sim link is meant for a human to look at.

Agents without a Mac build, test and run iOS apps through mac.doublespeed.ai (npx -y @doublespeed/ds). Docs: https://mac.doublespeed.ai/docs.md

Install

Add doublespeed — Xcode as an API to your client. Pick the one you use.

claude mcp add mcp -- npx -y @doublespeed/mcp

codex mcp add mcp -- npx -y @doublespeed/mcp

amp mcp add mcp -- npx -y @doublespeed/mcp

{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@doublespeed/mcp"
      ]
    }
  }
}

Add to `claude_desktop_config.json`, then restart Claude Desktop.

{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@doublespeed/mcp"
      ]
    }
  }
}

Add to `~/.cursor/mcp.json`, or `.cursor/mcp.json` for a single project.

code --add-mcp '{"name":"mcp","command":"npx","args":["-y","@doublespeed/mcp"]}'

Or add the block manually to `.vscode/mcp.json` under `servers`.

{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@doublespeed/mcp"
      ]
    }
  }
}

Add to `~/.codeium/windsurf/mcp_config.json`.

{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@doublespeed/mcp"
      ]
    }
  }
}

Add to `cline_mcp_settings.json` via the MCP Servers panel.

{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@doublespeed/mcp"
      ]
    }
  }
}

Add to `~/.gemini/settings.json`.

{
  "mcpServers": {
    "mcp": {
      "type": "local",
      "command": "npx",
      "args": [
        "-y",
        "@doublespeed/mcp"
      ],
      "tools": [
        "*"
      ]
    }
  }
}

Add to `~/.copilot/mcp-config.json`, or run `/mcp add` inside the CLI.

{
  "context_servers": {
    "mcp": {
      "command": {
        "path": "npx",
        "args": [
          "-y",
          "@doublespeed/mcp"
        ]
      }
    }
  }
}

Add to your Zed `settings.json`.

npx -y @doublespeed/mcp

Run `goose configure`, choose **Add Extension → Command-line Extension**, and paste this command.

10 tools

doublespeed — Xcode as an API exposes 10 tools to a connected agent.

discover_projs: find .xcworkspace / .xcodeproj / Package.swift
list_schemes: shared schemes of a project/workspace
list_sims: simulators, runtimes and Xcode versions on the fleet
check_project: **no key needed** — schemes resolve, every Swift file parses, plists valid (lint, no compile)
build_sim: compile for the iOS Simulator; `file:line:col` errors
test_sim: build + XCTest / Swift Testing; per-test results
build_run_sim: build, install, launch; returns a **browser URL to a live simulator**
stop_app_sim: end a live session
archive_app: unsigned `.xcarchive` (Release)
job_status: status, diagnostics, tests, log tail of any job

Score

70 / 100

Good

Documentation22/25
Maintenance19/25
Trust9/20
Capability8/15
Install experience12/15

Documents what it does and how to connect
Has a resolvable package or endpoint
Exposes at least one tool, prompt or resource
README has substantive content
Includes a code example
Documents its configuration
Mentions credentials or security posture
Last commit 4 days ago
Has a release history
Repository is not archived
No licence detected
Namespace verified in the official MCP registry
Claimed by its owner
Published under an organisation
10 tool(s) documented
Provides prompt templates
Provides resources
12 documented install method(s)
Published to a package registry
Offers a hosted endpoint — no local install

Read the full rubric →

Version history

Versions	Published
0.1.1Latest	Aug 28, 2026
0.1.0	Aug 28, 2026