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Document the WebSocket responses opt-out #4770

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Document the WebSocket responses opt-out
1fanwang Sep 8, 2026
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Add PowerShell form and clarify the SDK option polarity
1fanwang Sep 8, 2026
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14 changes: 14 additions & 0 deletions README.md
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Expand Up @@ -121,6 +121,20 @@ Launch `copilot` in a folder that contains code you want to work with.

By default, `copilot` utilizes Claude Sonnet 4.5. Run the `/model` slash command to choose from other available models, including Claude Sonnet 4 and GPT-5.

#### Falling back to the HTTP responses transport

Models that advertise a WebSocket responses endpoint use it by default. If your
network blocks WebSocket connections, or a session starts failing with
`400 input item ID does not belong to this connection`, set this variable to use
the HTTP responses transport instead:

```bash
export COPILOT_CLI_DISABLE_WEBSOCKET_RESPONSES=true
```
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This is the environment equivalent of the SDK's `capi.enableWebSocketResponses`
session option.
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### Experimental Mode

Experimental mode enables access to new features that are still in development. You can activate experimental mode by:
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