example_tool.py

import argparse
import webbrowser

import neuroglancer
import neuroglancer.cli

if __name__ == '__main__':
    ap = argparse.ArgumentParser()
    neuroglancer.cli.add_server_arguments(ap)
    args = ap.parse_args()
    neuroglancer.cli.handle_server_arguments(args)

    viewer = neuroglancer.Viewer()
    with viewer.txn() as s:
        s.layers['image'] = neuroglancer.ImageLayer(
            source='precomputed://gs://neuroglancer-public-data/flyem_fib-25/image',
            tool_bindings={
                'A': neuroglancer.ShaderControlTool(control='normalized'),
                'B': neuroglancer.OpacityTool(),
            },
        )

    print(viewer)
    webbrowser.open_new(viewer.get_viewer_url())