managed cursor mcp_config would overwrite existing .cursor/m

Error message

managed cursor mcp_config would overwrite existing .cursor/mcp.json

What it means

Error "managed cursor mcp_config would overwrite existing .cursor/mcp.json" thrown in multica-ai/multica.

Source

Thrown at server/internal/daemon/execenv/cursor_mcp.go:75

	}

	projectRoot := cursorProjectRoot(workDir)
	servers, err := parseCursorManagedMcpServers(mcpConfig)
	if err != nil {
		return "", err
	}

	cursorDir := filepath.Join(projectRoot, ".cursor")
	if err := recordMkdirAll(cursorDir, 0o755, manifest); err != nil {
		return "", fmt.Errorf("create .cursor dir: %w", err)
	}
	configData, err := marshalCursorMcpConfig(servers)
	if err != nil {
		return "", err
	}
	if err := recordWriteFile(filepath.Join(cursorDir, "mcp.json"), configData, 0o600, manifest); err != nil {
		if errors.Is(err, errPathPreExists) {
			return "", fmt.Errorf("managed cursor mcp_config would overwrite existing .cursor/mcp.json")
		}
		return "", fmt.Errorf("write .cursor/mcp.json: %w", err)
	}

	cursorDataDir := filepath.Join(envRoot, "cursor-data")
	projectDataDir := filepath.Join(cursorDataDir, "projects", cursorSlugifyPath(projectRoot))
	if err := os.MkdirAll(projectDataDir, 0o700); err != nil {
		return "", fmt.Errorf("create cursor project data dir: %w", err)
	}
	if err := removeCursorMcpAuthFile(projectDataDir); err != nil {
		return "", err
	}
	approvals, err := cursorMcpApprovalKeys(projectRoot, servers)
	if err != nil {
		return "", err
	}
	approvalData, err := json.MarshalIndent(approvals, "", "  ")
	if err != nil {

View on GitHub (pinned to 2c0912b6ec)

Solutions

Remove or merge the existing .cursor/mcp.json before enabling managed mcp_config.

When it happens

Trigger: Thrown at server/internal/daemon/execenv/cursor_mcp.go:75 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of multica-ai/multica@2c0912b6ec (2026-08-15). Data as JSON: /api/errors/0aa3e5e9fbd59914. Report an issue: GitHub.