fix: exclude shell tool references from prompts when tool is unavailable

.eslintignore

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+devtools-standalone/

GEMINI.md

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+## Gemini DevTools
+
+A standalone web UI for visualizing activity logs (network requests, console
+output) generated by Gemini CLI.
+
+### Quick Start
+
+To debug the latest local session:
+
+```bash
+npx gemini-cli-devtools
+```
+
+### Features
+
+- **Live Stream**: Real-time visualization of CLI activity via SSE.
+- **Session History**: Easily switch between different CLI sessions.
+- **Import/Export**: Load `.jsonl` activity logs for offline analysis or sharing
+  with teammates.
+- **Network Inspector**: Detailed request/response headers, payloads, and
+  timing.
+- **Console Viewer**: Collapsible, searchable, and themed console output.
+- **Theme Support**: System, Light, and Dark modes.
+
+---
+
 # Gemini CLI Project Context
 
 Gemini CLI is an open-source AI agent that brings the power of Gemini directly

devtools-standalone/GEMINI.md

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+# @google/gemini-cli-devtools
+
+A standalone Developer Tools package for debugging Node.js applications,
+offering a Chrome DevTools-like interface for Network and Console inspection.
+
+## Features
+
+- **Network Inspector**:
+  - Intercepts **HTTP/HTTPS** requests (via monkey-patching `http`/`https`).
+  - Intercepts **Undici/Fetch** requests (via `diagnostics_channel`).
+  - Supports **Server-Sent Events (SSE)** with visual chunk grouping.
+  - Automatically filters noise (e.g., `localhost:8097`, internal tunnels).
+  - Groups requests by API path prefix.
+- **Console Inspector**:
+  - Programmable interface to feed logs (`addConsoleLog`).
+  - Real-time updates via SSE.
+- **UI**: A modern React + Vite application served by an embedded Node.js HTTP
+  server.
+
+## Installation
+
+This package is intended for use within the Gemini CLI monorepo but can be
+adapted for other tools.
+
+## Usage
+
+### 1. Start the DevTools Server
+
+```typescript
+import { DevTools } from '@google/gemini-cli-devtools';
+
+// Initialize the singleton
+const devTools = DevTools.getInstance();
+
+// Enable network interception (http, https, fetch)
+devTools.enableGlobalInterception();
+
+// Start the UI server (returns the URL, e.g., http://127.0.0.1:54321)
+const url = await devTools.start();
+console.log(`DevTools running at ${url}`);
+```
+
+### 2. Log Console Messages
+
+DevTools does not automatically capture `console.log`. You must feed logs into
+it explicitly.
+
+```typescript
+// Example: connecting a logger or event bus to DevTools
+myEventBus.on('log', (payload) => {
+  // payload: { type: 'info'|'error'|'warn', content: string }
+  DevTools.getInstance().addConsoleLog(payload);
+});
+```
+
+### 3. Stop the Server
+
+```typescript
+devTools.stop();
+```
+
+## Architecture
+
+- **Backend (`src/index.ts`)**:
+  - Singleton class `DevTools`.
+  - Manages in-memory log storage (circular buffer).
+  - Runs an HTTP server to serve the frontend and API endpoints (`/logs`,
+    `/events`).
+- **Frontend (`client/`)**:
+  - React 18 + Vite application.
+  - Connects to backend via `EventSource` (SSE) for real-time updates.
+  - Provides "Network" and "Console" tabs.
+
+## API Reference
+
+### `DevTools.getInstance()`
+
+Returns the singleton instance.
+
+### `enableGlobalInterception()`
+
+Patches `http.request`, `https.request` and subscribes to
+`undici:request:create` channels to capture all outgoing network traffic.
+
+### `start(): Promise<string>`
+
+Starts the embedded HTTP server on a random available port. Returns the full
+URL.
+
+### `addConsoleLog(payload: ConsoleLogPayload)`
+
+Adds a log entry to the Console tab.
+
+- `payload.type`: `'log' | 'warn' | 'error' | 'debug' | 'info'`
+- `payload.content`: String message.
+
+## Development
+
+### Build
+
+```bash
+# Build both frontend and backend
+npm run build -w @google/gemini-cli-devtools
+```
+
+### Run Frontend in Dev Mode
+
+1.  Start a backend process (e.g., via the CLI in debug mode) to serve the API.
+2.  Run the frontend with Vite for hot-reloading:
+    ```bash
+    cd packages/devtools
+    npm run build:client -- --watch
+    ```

devtools-standalone/client/index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Gemini CLI DevTools</title>
+    <style>
+      html,
+      body,
+      #root {
+        height: 100%;
+        margin: 0;
+        padding: 0;
+        font-family:
+          -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica,
+          Arial, sans-serif;
+        overflow: hidden;
+      }
+    </style>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>