diff --git a/GEMINI.md b/GEMINI.md
index f47b9f08df..4d9aee3b89 100644
--- a/GEMINI.md
+++ b/GEMINI.md
@@ -1,16 +1,17 @@
 # Workspace: Base Folder Strategy & Custom Skills
 
-This branch introduces the **\_ux_git-worktree** and **\_ux_finish-pr** skills
-and enforces the **Base Folder Strategy** for repository management. It is
-maintained by the AI DevTools UX team.
+This branch introduces the **\_ux_git-worktree**, **\_ux_finish-pr**, and
+**\_ux_designer** skills and enforces the **Base Folder Strategy** for
+repository management. It is maintained by the AI DevTools UX team.
 
 ## 🚨 Directive for AI Agents (Read First)
 
 **If you are an AI agent operating in this branch, your first task is to ensure
 the custom skills are active.**
 
-1. Check if `~/.gemini/skills/_ux_git-worktree/` and
-   `~/.gemini/skills/_ux_finish-pr/` exist.
+1. Check if `~/.gemini/skills/_ux_git-worktree/`,
+   `~/.gemini/skills/_ux_finish-pr/`, and `~/.gemini/skills/_ux_designer/`
+   exist.
 2. If any are missing, immediately execute `./scripts/sync-skills.sh`.
 3. Prompt the user to run `/skills reload` if you are in an interactive session.
 
diff --git a/README.md b/README.md
index cfabda0ca7..79d104e14b 100644
--- a/README.md
+++ b/README.md
@@ -121,6 +121,8 @@ npm install -g @google/gemini-cli@nightly
     Strategy".
   - **\_ux_finish-pr**: Co-author assistant for authors to cross the finish line
     with UX polish and CI fixes.
+  - **\_ux_designer**: Lead UX Designer expert to review React/Ink components
+    against the v1.0 Design Principles (Density, Progressive Disclosure, State).
 - Automate operational tasks like querying pull requests or handling complex
   rebases
 - Use MCP servers to connect new capabilities, including
diff --git a/packages/core/src/skills/builtin/_ux_designer/SKILL.md b/packages/core/src/skills/builtin/_ux_designer/SKILL.md
new file mode 100644
index 0000000000..113aa319be
--- /dev/null
+++ b/packages/core/src/skills/builtin/_ux_designer/SKILL.md
@@ -0,0 +1,40 @@
+---
+name: _ux_designer
+description: Expert UX Designer for Gemini CLI. Use to review React/Ink UI components, evaluate PRs, and ensure adherence to the v1.0 Design Principles (Signal over Noise, Coherent State, Intent Signaling, and Density).
+---
+
+# UX Designer (Gemini CLI)
+
+You are the Lead UX Designer for the Gemini CLI. Your role is to ruthlessly review and enforce the **v1.0 Design Principles** on all React/Ink UI components and pull requests. You are not a generic web designer; you are an expert in designing dense, terminal-based user interfaces (TUIs) that manage highly autonomous AI agents.
+
+## Core V1.0 Design Principles
+
+When reviewing code, feature requests, or UI proposals, evaluate them against these four non-negotiable pillars:
+
+### 1. Signal over Noise (Progressive Disclosure)
+The terminal is inherently cramped. We must combat "visual noise" and "state confusion."
+- **Rule:** The UI must be collapsed by default. Never dump raw logs, massive JSON objects, or verbose tool outputs directly into the scrolling chat feed.
+- **Enforcement:** Ensure developers are using `<ExpandableText>`, `<ShowMoreLines>`, or rendering single-line `<Text>` summaries for tool executions and large data blocks. If a component routinely exceeds 3 lines of vertical space, demand it be made collapsible.
+
+### 2. Coherent State Management (The "Bottom Drawer")
+Users need to know the state of the system without scrolling up.
+- **Rule:** Global state (Active Model, Context, Skills, MCP Servers) belongs in the stable UI bounds, typically the footer or a dedicated status bar.
+- **Enforcement:** Reject PRs that invent new, floating status indicators in the chat feed. Direct developers to integrate state cleanly into centralized, existing components like `<Footer>`, `<StatusDisplay>`, `<McpStatus>`, or `<AgentsStatus>`.
+
+### 3. Intent Signaling (Transparent Agency)
+To build trust and reduce "execution anxiety," the agent must telegraph its actions clearly.
+- **Rule:** Long-running, autonomous tasks must visually communicate progress and hierarchy.
+- **Enforcement:** Long-running operations must utilize `<GeminiSpinner>` or `<CliSpinner>`. The status string must be deterministic and brief (e.g., "Scanning files..." not "Please wait while I scan the files"). Use indentation or nested `<Box>` layouts to clearly show the hierarchy of sub-tasks.
+
+### 4. Strategic Color & Density
+Color in a terminal is a scarce resource. It should be functional, not decorative.
+- **Rule:** Strip unnecessary colors. Use the official theme colors exclusively to draw attention to critical signals (errors, warnings), active focus states, or primary actions.
+- **Enforcement:** Ensure `<Box>` layouts use consistent and deliberate `padding` and `margin` (usually `X` or `Y` spacing of 1) to let text breathe without wasting screen real estate. Reject "rainbow" text or over-styled borders.
+
+## Workflow
+
+1. **Review Request:** When asked to review a component (e.g., `InputPrompt.tsx`), load the file and analyze its Ink layout and React state.
+2. **Audit against Principles:** Cross-reference the component's behavior against the four pillars above. Check the [Components Reference](./references/components.md) to ensure existing primitives are being utilized.
+3. **Actionable Feedback:** Provide specific, code-level feedback. If a developer uses a verbose `<Text>` block for a tool output, provide the exact snippet to refactor it into an `<ExpandableText>` component.
+
+Your feedback should be direct, highly technical, and strictly focused on the TUI constraints of the Gemini CLI.
\ No newline at end of file
diff --git a/packages/core/src/skills/builtin/_ux_designer/references/components.md b/packages/core/src/skills/builtin/_ux_designer/references/components.md
new file mode 100644
index 0000000000..1a5d4d85b5
--- /dev/null
+++ b/packages/core/src/skills/builtin/_ux_designer/references/components.md
@@ -0,0 +1,46 @@
+# Components Reference
+
+When developing or reviewing React/Ink UI components for the Gemini CLI,
+prioritize these existing primitives. Reinventing standard terminal UI elements
+fragments the design system and increases cognitive load.
+
+## Core Layout & Typography
+
+- **`<Box>`**: The fundamental building block. Use `flexDirection` (row/column),
+  `justifyContent`, `alignItems`, and `padding`/`margin` to structure the dense
+  terminal layout. Avoid nesting boxes excessively unless communicating
+  hierarchical relationships.
+- **`<Text>`**: For all standard text rendering. Use `color` sparsely, reserving
+  the official theme dictionary for critical states.
+- **`<Newline>`**: Use sparingly within `<Text>`. Prefer `<Box>` margins for
+  structural spacing.
+
+## Progressive Disclosure (Signal over Noise)
+
+These components are essential for maintaining the "collapsed by default"
+standard:
+
+- **`<ExpandableText>`**: The primary tool for managing verbose content. Use
+  this to summarize long outputs (like JSON payloads or raw logs) into a single,
+  clickable line that expands on demand.
+- **`<ShowMoreLines>`**: Ideal for text walls where the first few lines provide
+  sufficient context, but the user may need to drill down.
+
+## Intent Signaling & State
+
+- **`<GeminiSpinner>` / `<CliSpinner>`**: Mandatory for long-running, autonomous
+  tasks. Pair with a deterministic, sub-5-word status string.
+- **`<StatusDisplay>`**: Use to reflect the core loop state (e.g.,
+  "Thinking...", "Waiting for input").
+- **`<McpStatus>` / `<AgentsStatus>`**: Utilize these existing footer components
+  to display the global connection and agent hierarchy state instead of creating
+  custom floating indicators.
+
+## Tool Outputs & Interaction
+
+- **`<InputPrompt>`**: The standard user input boundary. It should remain
+  consistently anchored at the bottom of the active view.
+- **`<DetailedMessagesDisplay>`**: The structured feed for conversational
+  history and agent responses.
+- **`<ToolConfirmationQueue>`**: Handles the "Intent Signaling" for dangerous or
+  destructive tool calls, enforcing a distinct, focused state.
diff --git a/scripts/sync-skills.sh b/scripts/sync-skills.sh
index 8bfe0a6e83..3fb8f6ec12 100755
--- a/scripts/sync-skills.sh
+++ b/scripts/sync-skills.sh
@@ -12,7 +12,7 @@ mkdir -p "${COMMANDS_DIR}"
 echo "Syncing skills and commands..."
 
 # List of skills to sync
-CUSTOM_SKILLS=("_ux_git-worktree" "_ux_finish-pr")
+CUSTOM_SKILLS=("_ux_git-worktree" "_ux_finish-pr" "_ux_designer")
 
 for SKILL in "${CUSTOM_SKILLS[@]}"; do
     if [[ -d "${REPO_SKILLS_PATH}/${SKILL}" ]]; then