Add Omni Flow Plugin

[handofhate]

Intelligent URL address bar with real-time browser history, autocomplete, and already-open-tab detection — a faux omnibox for Flow Launcher.

[deefrawley]

Add a README to your repo please that explains what your plugin does

[handofhate]

Add a README to your repo please that explains what your plugin does

oops, left it out on accident. fixed!

[deefrawley]

Default keyword is bh not of so you may want to update the plugin or the docs.

Also I changed the browser to my default of Brave before running for the first time and got an error. Changed back to the default of Chrome but same thing

1. Upload log file: C:\Users\Damien\AppData\Roaming\FlowLauncher\Logs\2.1.1\Flow.Launcher.2026-03-30.log
2. Copy below exception message

Flow Launcher version: 2.1.1
OS Version: 19045.7058
IntPtr Length: 8
x64: True

Python Path: C:\Users\Damien\AppData\Roaming\FlowLauncher\Environments\Python\PythonEmbeddable-v3.11.4\pythonw.exe
Node Path: C:\Users\Damien\AppData\Roaming\FlowLauncher\Environments\Node.js\Node-v16.18.0\node-v16.18.0-win-x64\node.exe

Date: 03/30/2026 11:10:17
Exception:
Omni Flow Exception: 
Websites: https://github.com/handofhate/Omni-Flow
Author: handofhate
Version: 1.0.0
Flow.Launcher.Core.ExternalPlugins.FlowPluginException: OSError: [WinError 6] The handle is invalid

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<string>", line 9, in <module>
  File "<frozen runpy>", line 291, in run_path
  File "<frozen runpy>", line 98, in _run_module_code
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Users\Damien\AppData\Roaming\FlowLauncher\Plugins\OmniFlow-1.0.0\run.py", line 11, in <module>
    BrowserOmnibox()
  File "C:\Users\Damien\AppData\Roaming\FlowLauncher\Plugins\OmniFlow-1.0.0\plugin\main.py", line 21, in __init__
    tab_server.start(port=self._extension_port())
  File "C:\Users\Damien\AppData\Roaming\FlowLauncher\Plugins\OmniFlow-1.0.0\plugin\tab_server.py", line 53, in start
    if _sidecar_running():
       ^^^^^^^^^^^^^^^^^^
  File "C:\Users\Damien\AppData\Roaming\FlowLauncher\Plugins\OmniFlow-1.0.0\plugin\tab_server.py", line 45, in _sidecar_running
    os.kill(pid, 0)
SystemError: <built-in function kill> returned a result with an exception set

 ---> System.IO.InvalidDataException: OSError: [WinError 6] The handle is invalid

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<string>", line 9, in <module>
  File "<frozen runpy>", line 291, in run_path
  File "<frozen runpy>", line 98, in _run_module_code
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Users\Damien\AppData\Roaming\FlowLauncher\Plugins\OmniFlow-1.0.0\run.py", line 11, in <module>
    BrowserOmnibox()
  File "C:\Users\Damien\AppData\Roaming\FlowLauncher\Plugins\OmniFlow-1.0.0\plugin\main.py", line 21, in __init__
    tab_server.start(port=self._extension_port())
  File "C:\Users\Damien\AppData\Roaming\FlowLauncher\Plugins\OmniFlow-1.0.0\plugin\tab_server.py", line 53, in start
    if _sidecar_running():
       ^^^^^^^^^^^^^^^^^^
  File "C:\Users\Damien\AppData\Roaming\FlowLauncher\Plugins\OmniFlow-1.0.0\plugin\tab_server.py", line 45, in _sidecar_running
    os.kill(pid, 0)
SystemError: <built-in function kill> returned a result with an exception set

   at Flow.Launcher.Core.Plugin.JsonRPCPlugin.ExecuteAsync(ProcessStartInfo startInfo, CancellationToken token) in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\JsonRPCPlugin.cs:line 220
   at Flow.Launcher.Core.Plugin.JsonRPCPlugin.ExecuteAsync(ProcessStartInfo startInfo, CancellationToken token) in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\JsonRPCPlugin.cs:line 225
   at Flow.Launcher.Core.Plugin.JsonRPCPlugin.QueryAsync(Query query, CancellationToken token) in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\JsonRPCPlugin.cs:line 238
   at Flow.Launcher.Core.Plugin.PluginManager.<>c__DisplayClass32_0.<<QueryForPluginAsync>b__1>d.MoveNext() in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\PluginManager.cs:line 423
--- End of stack trace from previous location ---
   at Flow.Launcher.Infrastructure.Stopwatch.DebugAsync(String className, String message, Func`1 action, String methodName) in C:\projects\flow-launcher\Flow.Launcher.Infrastructure\Stopwatch.cs:line 31
   at Flow.Launcher.Core.Plugin.PluginManager.QueryForPluginAsync(PluginPair pair, Query query, CancellationToken token) in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\PluginManager.cs:line 422
   --- End of inner exception stack trace ---
   at Flow.Launcher.Core.Plugin.PluginManager.<>c__DisplayClass32_1.<QueryForPluginAsync>b__2(ActionContext _) in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\PluginManager.cs:line 452
   at Flow.Launcher.Plugin.Result.ExecuteAsync(ActionContext context) in /_/Flow.Launcher.Plugin/Result.cs:line 281
   at Flow.Launcher.ViewModel.MainViewModel.OpenResultAsync(String index) in C:\projects\flow-launcher\Flow.Launcher\ViewModel\MainViewModel.cs:line 520
   at CommunityToolkit.Mvvm.Input.AsyncRelayCommand.AwaitAndThrowIfFailed(Task executionTask)
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_0(Object state)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

[handofhate]

Apologies, should be fixed.

[deefrawley]

1. Upload log file: C:\Users\Damien\AppData\Roaming\FlowLauncher\Logs\2.1.1\Flow.Launcher.2026-03-30.log
2. Copy below exception message

Flow Launcher version: 2.1.1
OS Version: 19045.7058
IntPtr Length: 8
x64: True

Python Path: C:\Users\Damien\AppData\Roaming\FlowLauncher\Environments\Python\PythonEmbeddable-v3.11.4\pythonw.exe
Node Path: C:\Users\Damien\AppData\Roaming\FlowLauncher\Environments\Node.js\Node-v16.18.0\node-v16.18.0-win-x64\node.exe

Date: 03/30/2026 18:19:15
Exception:
Omni Flow Exception: 
Websites: https://github.com/handofhate/Omni-Flow
Author: handofhate
Version: 1.0.1
Flow.Launcher.Core.ExternalPlugins.FlowPluginException: The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. Path: $ | LineNumber: 0 | BytePositionInLine: 0.
 ---> System.Text.Json.JsonException: The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. Path: $ | LineNumber: 0 | BytePositionInLine: 0.
 ---> System.Text.Json.JsonReaderException: The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. LineNumber: 0 | BytePositionInLine: 0.
   at System.Text.Json.ThrowHelper.ThrowJsonReaderException(Utf8JsonReader& json, ExceptionResource resource, Byte nextByte, ReadOnlySpan`1 bytes)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state)
   --- End of inner exception stack trace ---
   at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& state, JsonReaderException ex)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.ContinueDeserialize(ReadBufferState& bufferState, JsonReaderState& jsonReaderState, ReadStack& readStack, T& value)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.DeserializeAsync(Stream utf8Json, CancellationToken cancellationToken)
   at Flow.Launcher.Core.Plugin.JsonRPCPlugin.DeserializedResultAsync(Stream output) in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\JsonRPCPlugin.cs:line 63
   at Flow.Launcher.Core.Plugin.JsonRPCPlugin.DeserializedResultAsync(Stream output) in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\JsonRPCPlugin.cs:line 66
   at Flow.Launcher.Core.Plugin.JsonRPCPlugin.QueryAsync(Query query, CancellationToken token) in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\JsonRPCPlugin.cs:line 240
   at Flow.Launcher.Core.Plugin.PluginManager.<>c__DisplayClass32_0.<<QueryForPluginAsync>b__1>d.MoveNext() in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\PluginManager.cs:line 423
--- End of stack trace from previous location ---
   at Flow.Launcher.Infrastructure.Stopwatch.DebugAsync(String className, String message, Func`1 action, String methodName) in C:\projects\flow-launcher\Flow.Launcher.Infrastructure\Stopwatch.cs:line 31
   at Flow.Launcher.Core.Plugin.PluginManager.QueryForPluginAsync(PluginPair pair, Query query, CancellationToken token) in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\PluginManager.cs:line 422
   --- End of inner exception stack trace ---
   at Flow.Launcher.Core.Plugin.PluginManager.<>c__DisplayClass32_1.<QueryForPluginAsync>b__2(ActionContext _) in C:\projects\flow-launcher\Flow.Launcher.Core\Plugin\PluginManager.cs:line 452
   at Flow.Launcher.Plugin.Result.ExecuteAsync(ActionContext context) in /_/Flow.Launcher.Plugin/Result.cs:line 281
   at Flow.Launcher.ViewModel.MainViewModel.OpenResultAsync(String index) in C:\projects\flow-launcher\Flow.Launcher\ViewModel\MainViewModel.cs:line 520
   at CommunityToolkit.Mvvm.Input.AsyncRelayCommand.AwaitAndThrowIfFailed(Task executionTask)
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_0(Object state)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

[deefrawley]

Also can you please make it very clear in the README that there is the sidecar process that will continue to run outside of the plugin so users are clear on what they are expecting by downloading this plugin?

[handofhate]

Also can you please make it very clear in the README that there is the sidecar process that will continue to run outside of the plugin so users are clear on what they are expecting by downloading this plugin?

will do. what tab mode were you testing in with that error?

[deefrawley]

That was just testing straight out of the box with no config changes.

[jjw24]

Hello, interesting plugin idea.

I can also reproduce the error by just using the action keyword. Could you also please explicitly state in the README that the plugin:

1. Will spawn a separate persistent Python sidecar server process that runs in the background and listens on 127.0.0.1 to receive tab updates
2. Uses PowerShell script setup_cdp.ps1 that modifies Chrome .lnk shortcut arguments to add --remote-debugging-port=9222
3. Runs the local server that sets Access-Control-Allow-Origin: * and isn’t remotely accessible

[handofhate]

Sorry for the long wait, been a busy few weeks. Hopefully all issues are fixed:

• shouldn't see any more issues at first launch
• removed CDP mode (wanted to narrow scope to increase reliability)
• sidecar now won't start while in default 'None' mode
• updated README with requested changes

Trigger default is now 'GO'. I'm indecisive but i've been using GO for a few weeks and it feels nice to my brain.

Thanks y'all!