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LangBot/docs/en/plugin/compatibility.md
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Junyan Qin (Chin) c493d4ef58 V4.5.0 (#68)
* doc: add service api refs (#67)

* doc: add service api refs

* fix: page title

* docs: add Service API overview and images, mark as Beta

* doc: update for plugin system on windows

* docs: perf

* doc: add pipeline plugin comments
2025-11-10 23:12:48 +08:00

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# System Compatibility
LangBot's plugin system utilizes mechanisms such as `Asyncio` and `Subprocess`, which work well on Unix-like systems (such as Linux, macOS), but have some issues on Windows, preventing plugins from running properly.
Python's asynchronous event loop on Windows defaults to using `ProactorEventLoop`, but this event loop lacks support for Stdio, while LangBot in non-Docker environments relies on Stdio to communicate with Plugin Runtime, and Plugin Runtime also depends on Stdio to communicate with plugins.
If we switch to using `SelectorEventLoop`, it would prevent Plugin Runtime and plugins from starting properly, as `SelectorEventLoop` does not support `Subprocess`.
For detailed information about these issues, please refer to: [Python Official Documentation](https://docs.python.org/3.13/library/asyncio-platforms.html)
## Solution
Unlike the tight coupling between subprocess management and Stdio communication on Unix-like systems, LangBot and the Plugin Runtime automatically switch to a hybrid subprocess + WebSocket communication strategy on Windows. LangBot still launches the Plugin Runtime via a subprocess, but communicates with it over WebSocket; similarly, the Plugin Runtime starts each installed plugin via subprocesses while communicating with them through WebSocket.
This behavior is automatically selected based on the OS, so no manual configuration is required.