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Xcode MCP setup — enable mcpbridge, per-client config, permission handling, multi-Xcode targeting, troubleshooting
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SOC 직업 분류 기준
SKILL.md 표시 중
| name | axiom-xcode-mcp-setup |
| description | Xcode MCP setup — enable mcpbridge, per-client config, permission handling, multi-Xcode targeting, troubleshooting |
| license | MIT |
Without this toggle, xcrun mcpbridge connects but returns no tools.
claude mcp add --transport stdio xcode -- xcrun mcpbridge
Verify: claude mcp list should show xcode server.
codex mcp add xcode -- xcrun mcpbridge
Create or edit .cursor/mcp.json in your project root:
{
"mcpServers": {
"xcode": {
Cursor-specific note: Cursor is a strict MCP client. Xcode's mcpbridge omits structuredContent when tools declare outputSchema, which violates the MCP spec. If Cursor rejects responses, use XcodeMCPWrapper as a proxy:
{
"mcpServers": {
"xcode": {
"command": "/path/to/XcodeMCPWrapper",
"args": []
}
}
}
Create or edit .vscode/mcp.json:
{
"servers": {
"xcode": {
"type": "stdio",
"command": "xcrun",
"args": ["mcpbridge"]
}
}
}
gemini mcp add xcode -- xcrun mcpbridge
After configuration, call XcodeListWindows (no parameters). You should see:
tabIdentifier: <uuid>, workspacePath: /path/to/YourProject.xcodeproj
If you see an empty list, ensure a project is open in Xcode.
When an MCP client first connects, Xcode shows a permission dialog:
PID-based approval: Permission is granted per-process. If the client restarts (new PID), you'll see the dialog again. This is expected behavior.
When multiple Xcode instances are running:
mcpbridge auto-selects using this fallback:
xcode-selectSet MCP_XCODE_PID to target a specific instance:
# Find Xcode PIDs
pgrep -x Xcode
# Claude Code with specific PID
claude mcp add --transport stdio xcode -- env MCP_XCODE_PID=12345 xcrun mcpbridge
MCP_XCODE_SESSION_ID provides a stable UUID for tool sessions, useful when tracking interactions across reconnections.
digraph troubleshoot {
rankdir=TB;
"Connection failed?" [shape=diamond];
"tools/list empty?" [shape=diamond];
"Wrong project?" [shape=diamond];
"Repeated permission prompts?" [shape=diamond];
"Client rejects responses?" [shape=diamond];
"Check Xcode running + toggle on" [shape=box];
"Open a project in Xcode" [shape=box];
"Use MCP_XCODE_PID or check tab targeting" [shape=box];
"Expected: PID changes on restart" [shape=box];
"Use XcodeMCPWrapper proxy" [shape=box];
"Connection failed?" -> "Check Xcode running + toggle on" [label="refused/timeout"];
"Connection failed?" -> "tools/list empty?" [label="connects OK"];
"tools/list empty?" -> "Open a project in Xcode" [label="no tools"];
"tools/list empty?" -> "Wrong project?" [label="tools listed"];
"Wrong project?" -> "Use MCP_XCODE_PID or check tab targeting" [label="yes"];
"Wrong project?" -> "Repeated permission prompts?" [label="no"];
"Repeated permission prompts?" -> "Expected: PID changes on restart" [label="yes"];
"Repeated permission prompts?" -> "Client rejects responses?" [label="no"];
"Client rejects responses?" -> "Use XcodeMCPWrapper proxy" [label="strict client (Cursor)"];
}
| Symptom | Cause | Fix |
|---|---|---|
| "Connection refused" | Xcode not running or MCP toggle off | Launch Xcode, enable MCP in Settings > Intelligence |
| tools/list returns empty | No project open, or permission not granted | Open a project, check for permission dialog in Xcode |
| Tools target wrong project | Multiple Xcode windows, wrong tab | Call XcodeListWindows, use correct tabIdentifier |
| Repeated permission prompts | Client restarted (new PID) | Expected behavior — approve each time |
| Cursor/strict client errors | Missing structuredContent in response | Use XcodeMCPWrapper as proxy |
| "No such command: mcpbridge" | Xcode < 26.3 | Update to Xcode 26.3+ |
| Slow/hanging tool calls | Large project indexing | Wait for Xcode indexing to complete |
Xcode also supports MCP servers for its built-in assistants. Config files live at:
~/Library/Developer/Xcode/CodingAssistant/codex
~/Library/Developer/Xcode/CodingAssistant/ClaudeAgentConfig
These are for configuring Xcode's internal assistant, separate from external MCP client setup.
Docs: /xcode/mcp-server
Skills: axiom-xcode-mcp-tools, axiom-xcode-mcp-ref