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docs: custom themes in extensions (#19219)

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Jack Wotherspoon
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@@ -21,6 +21,7 @@ Extensions offer a variety of ways to customize Gemini CLI.
| **[Context file (`GEMINI.md`)](reference.md#contextfilename)** | A markdown file containing instructions that are loaded into the model's context at the start of every session. | Use this to define the "personality" of your extension, set coding standards, or provide essential knowledge that the model should always have. | CLI provides to model |
| **[Agent skills](../cli/skills.md)** | A specialized set of instructions and workflows that the model activates only when needed. | Use this for complex, occasional tasks (like "create a PR" or "audit security") to avoid cluttering the main context window when the skill isn't being used. | Model |
| **[Hooks](../hooks/index.md)** | A way to intercept and customize the CLI's behavior at specific lifecycle events (e.g., before/after a tool call). | Use this when you want to automate actions based on what the model is doing, like validating tool arguments, logging activity, or modifying the model's input/output. | CLI |
| **[Custom themes](reference.md#themes)** | A set of color definitions to personalize the CLI UI. | Use this to provide a unique visual identity for your extension or to offer specialized high-contrast or thematic color schemes. | User (via /theme) |
## Step 1: Create a new extension