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docs(cli): add System Prompt Override (GEMINI_SYSTEM_MD) (#9515)

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Shehab
2025-12-19 22:11:37 +02:00
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docs/get-started/configuration.md
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@@ -1129,6 +1129,18 @@ the `advanced.excludedEnvVars` setting in your `settings.json` file.
- **`GEMINI_SANDBOX`**:
- Alternative to the `sandbox` setting in `settings.json`.
- Accepts `true`, `false`, `docker`, `podman`, or a custom command string.
- **`GEMINI_SYSTEM_MD`**:
- Replaces the built‑in system prompt with content from a Markdown file.
- `true`/`1`: Use project default path `./.gemini/system.md`.
- Any other string: Treat as a path (relative/absolute supported, `~`
expands).
- `false`/`0` or unset: Use the built‑in prompt. See
[System Prompt Override](../cli/system-prompt.md).
- **`GEMINI_WRITE_SYSTEM_MD`**:
- Writes the current built‑in system prompt to a file for review.
- `true`/`1`: Write to `./.gemini/system.md`. Otherwise treat the value as a
path.
- Run the CLI once with this set to generate the file.
- **`SEATBELT_PROFILE`** (macOS specific):
- Switches the Seatbelt (`sandbox-exec`) profile on macOS.
- `permissive-open`: (Default) Restricts writes to the project folder (and a