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-rw-r--r--docs/cli/commands.md2
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diff --git a/docs/cli/commands.md b/docs/cli/commands.md
index e1692ccd..f6e9451e 100644
--- a/docs/cli/commands.md
+++ b/docs/cli/commands.md
@@ -282,3 +282,5 @@ The `!` prefix lets you interact with your system's shell directly from within G
- When exited, the UI reverts to its standard appearance and normal Gemini CLI behavior resumes.
- **Caution for all `!` usage:** Commands you execute in shell mode have the same permissions and impact as if you ran them directly in your terminal.
+
+- **Environment Variable:** When a command is executed via `!` or in shell mode, the `GEMINI_CLI=1` environment variable is set in the subprocess's environment. This allows scripts or tools to detect if they are being run from within the Gemini CLI.